Righto, I think that might be time to say goodnight. Well done Jason Day, no longer the best player never to win a major championship. And nobody handed it to him, he went out and won it.
'I've got to soak it in'
Jason Day speaks to Sky Sports: "You guys saw on the 18th hole, even before I finished I had tears coming out of my eyes. I don't need to think about anything else now, it's such a special moment. I've just got to soak it in.
"I drove the ball so good and hit a lot of greens. I was patient in myself and disciplined. Everything mixed together it worked out perfectly."
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So, that's the 2015 major championships done and dusted and we got three quality winners. It's exciting times for golf, we have a new world number one in Jordan Spieth, who is only 22; an old number one in Rory McIlroy, who is only 26; a new major winner in Jason Day, who is only 27. Chuck in lots more coming men, and golf is looking fresher than for a long time.
The champion speaks...
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Jason Day addresses spectators in his first interview at the side of the 18th green: "It's been a long journey. I didn't expect to ever grow up and be on the PGA Tour, it's an amazing feeling.
"I didn't expect I was going to cry. A lot of emotion has come out just because I've been close so many times and fallen short. To be able to play the way I did today in tough conditions with Jordan in the group. He was the favourite, to be able to play the way I did was amazing.
"Overall I'm just really pleased with how I played, I couldn't ask for anything better."
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Brian Gaffney gets a glass bowl for being the lowest club pro, he finished on +5 after a 71 and was the first club pro to make the cut since 2011. And now Jason has the handsome Wanamaker Trophy in his mitts. Up it goes, the Queenslander deserves it, he's grafted like a dog to land a big one and after so many near misses, his dream has finally come true.
'Can't have better'
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I should add that Jordan Spieth, having won the Masters and the US Open this year, finished joint fourth at the Open and second today, is the new world number one, displacing Northern Ireland's Rory McIlroy. A lot of people seem to have found it difficult to comprehend that the Age of Tiger is over, but with Woods having missed a third successive major cut and not won one since 2008, I think we can now say with some conviction that we are in the post-Tiger era. And it looks quite exciting...
"When you think back to the US Open, with the attack of vertigo and we really feared for Jason Day's health, it's an extraordinary story."
Day -20 (67), Spieth -17 (68), Grace -15 (69), Rose -14 (70)
So, Jason Day is the first Aussie since Steve Elkington in 1995 to win the USPGA and only the fifth Aussie in all. He is also the 11th Aussie winner of a major. His -20 total also breaks the record for the lowest under-par total in a major, beating Tiger Woods's -19 at the 2000 Open.
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Jay Townsend
Former American professional golfer on BBC Radio 5 live
"It was a wonderful effort. he was pretty much in control all day. He never really looked like he was wobbling. The only time was the second shot on nine and the he went on to save par, that was a huge turnaround, a big turning point in the day."
"There is not a dry eye in the house as Jason Day becomes a major champion. His son runs onto the green. It's dad and son as they celebrate a major victory which has been a long time coming."
DAY WINS THE US PGA
And Day pops it in - finally he's bagged one of the big ones, after nine top-10 finishes. Tremendous stuff, and not before time.
"Day is in floods of tears, it's a good job he only has a six-inch putt to knock in."
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It's some setting for a maiden major, the sun beginning to lower over Lake Michigan and the galleries full to the brim. Day's wife, Ellie, and son, Dash, await him behind the green. As is usually the case when an old man does something he thinks is very special, his little boy is far more interested in a disc his mum is waving in front of his face. He'll understand one day, he won't be able to miss the Wanamaker Trophy stuck on top of the TV. Day cosies the ball up towards the hole before breaking into tears, breaking your duck can be a little bit overwhelming.
'Great dude'
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Spieth with a fine approach at 18, from about 200 yards. Day now, from 184 yards, and it's safely on. Day pretty much home and hosed...
"Well done Branden Grace, $680,000 will land in his bank account."
Listen to the final strokes of this championship on BBC Radio 5 live by clicking the live coverage tab at the top of this page.
Grace -15 (69), Rose -14 (70)
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Rose's par effort is majestic, but it had too much work to do. It's a bogey at the last for the Englishman, a round of 70 and -14 overall. Grace pips him for third with a par, the South African finishes one ahead of -15.
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Day -20 (17)
PGA Tour writer Brian Wacker surveys the scene at Whistling Straits...
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Rose with his third at 18 and he's left it well short, coming out of some rubbish. Will do well to make par from there. Here are Day and Spieth marching down the 18th, as up ahead Grace putts for birdie... that's not great, he's got a knee-knocker for par...
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Grace into the heart of the green at the last, he's vying with playing partner Rose for outright third. Spieth finds the collar of the fairway with his drive at 18, Day gets chocs away with his driver after what seems like an age... hammers it, just one more good swing and he's home and dry...
Day -20 (17), Spieth -17 (17)
Spieth from a little closer than Day but he doesn't get the pace right, he's got a nervy one for par. Spieth is a very likeable chap, some of his little exclamations have a comic book innocence about them, so the fans are pleased to see that par putt finally get gobbled up after circling the drain. Day makes par, stays three clear.
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Day with a huge birdie putt at 17... the thumbs up from Spieth tells you everything you need to know, it's a corker, he'll tap in for par to stay -20...
Day -20 (16), Spieth -17 (16)
Day gives a little puff and a growl before addressing his ball at 17 and finding the guts of the green. At this stage, that's all he needs to do. Spieth also on, he pretty much has to stick his long-range birdie putt in before making another birdie at 18, and even then he probably won't win it...
Grace -15 (17), Rose -15 (17)
Birdie for Grace on 17, he joins playing partner Rose on -15 and a tie for third. Dustin in with a 69 that included a quadruple eight and two eagles. Never let it be said that Johnson serves up the predictable.
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Day -20 (16)
Jay Townsend
Former American professional golfer on BBC Radio 5 live
"There's around about 800 yards of golf to play but looking ahead I think it'll be a really emotional 18th green when Jason Day gets that major win."
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Day -20 (16), Spieth -17 (16)
Day knows he's got it now, it's all in the eyes and the little smirk on his lips. In goes the birdie, back he goes to -20. Spieth follows him in, stays three behind with two to play...
What a shot!
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Spieth spends plenty of time examining his bunker shot at 16, breaking off to tell his caddie: "This is a hard shot..." Eventually he hits it and sticks it to within three feet. When the fat lady's singing, wherever that may be, Spieth will still be swinging. Day putting for eagle, however, and he misses by a couple of inches...
"This eagle putt for Jason Day, this is a big moment, were this to go on I think his fat lady would be singing merrily."
You can listen to Iain Carter and Jay Townsend by clicking on the live coverage tab at the top of this screen.
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Lahiri -13 (18)
Jay Townsend
Former American professional golfer on BBC Radio 5 live
"A fantastic week for Anirban Lahiri who has won twice on the European Tour this year. A fantastic talent and his game is just growing all the time."
Lahiri -13 (68)
Branden Grace with a crackerjack tee shot at 17, having missed a three-footer for birdie at 16. Lahiri is in with a 68 after a bogey at the last and has a share of the clubhouse lead. Currently tied for fifth, that makes it the best finish by an Indian in a major, beating Jeev Milkha Singh's tied ninth at the 2008 USPGA.
Koepka clubhouse leader on -13
It's a final-round 66 for Koepka and he leads in the clubhouse on -13. Spieth with an iffy second at 16, he's tugged it into the bunker. Advantage Day, as if he didn't have it already, and that advantage grows after a sweet approach, he's got a makeable putt for eagle to close the deal...
Aussies at the USPGA
Day -19 (16)
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Day would be the 11th Australian major winner, and a Day victory would be Australia's 17th major in all. Four Aussies have won the USPGA - Jim Ferrier won at Plum Hollow in 1947, David Graham at Oakland Hills in 1979, Wayne Grady at Shoal Creek in 1990 and Steve Elkington at the Riviera Country Club in 1995.
New world leader?
Spieth -16 (15)
Rose -15 (16)
Rose for birdie at 16 and he pours it in to get to -15, four off the lead. Spieth has birdied the 15th all three days and he might do so again after an unerring drive. Day has given his drive a serious ragging, that's pitched 300 yards down there...
Day -19 (15), Spieth -16 (15)
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Spieth doesn't really get close with his long-range birdie attempt at 15, Day in for bogey after his birdie attempt skips over the cellophane bridge. Spieth makes it 58 holes without a three-putt to trim the lead to three shots...
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Why Dustin, why?! Like Sisyphus rolling the boulder up a hill, he worked his way back up the leaderboard after an eight at the first but has just let the boulder slip, very nearly sticking his tee shot in the drink off tee at 17... he's on in two, but has got about 40 feet for par...
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Snedeker rounds off his round with a 75-foot putt... for par! That's a 69 for -10 in the clubhouse for the world number 30. Day to go first at 15, from just off the green... comes up well short, he's got a 15-footer for par. Alas for Spieth, he's putting from about 80 feet...
Coetzee clubhouse leader on -12
George Coetzee of South Africa is in with a 67 for the clubhouse lead on -12. Spieth with 192 left at 15, six iron... his ball doesn't do what he tells it to and it comes up short. Day fizzes his second out of the rough and over the back, but he should get up and down from there.
Footballers take in the action
It wouldn't be a major championship if a few footballers weren't taking in golf drama and uploading their views onto social media.
Raising the bar...
Day -20 (14)
Johnson -13 (16)
Remarkable performance by Dustin Johnson today - quadruple at the first, five over through four, but he's just made his second eagle of the day at 16 to get back to 13 under. 'Oh, what could have been' could end up being his epitaph. Day misses the fairway left at 15, but it looks OK. Spieth pings his drive bang centre...
What stands between Jason Day and glory
Day -20 (14)
No. 15 - 'Grand Strand' - the fourth hardest hole on the course this week.
No. 16 - 'Endless Bite' - the easiest hole on the course.
No. 17 - 'Pinched Nerve' - sixth hardest hole on the course.
No. 18 - 'Dyeabolical' - the hardest hole at Whistling Straits this week.
"He's leading by four. In charge of the final major of the year."
Day -20 (14), Spieth -16 (14)
Rose very nearly chips in at 15, Spieth keeps the tournament alive with a sweet right-to-lefter for par at 14. This kid is tough as teak, that was from about 20 feet. Day with a birdie putt for a four-stroke lead with four holes left... squeezes it in, it's his to lose now...
Lahiri -14 (16)
Rose with a very awkward lie at 15, feet in sand, ball on a hillock about three feet above his feet. Spieth can only flop out 20 feet past at 14, he's got a longun for par, with Day putting for birdie. Here's Lahiri with a birdie at 16, he's 14 under and doing his bit for the game of golf in India...
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... Day has found the dancefloor with his second at 14 - with Spieth scrabbling about in some nonsense, that could be game, set and match...
Streb clubhouse leader on -11
Robert Streb has the clubhouse lead on 11 under after a second successive 67, he's having a very good season indeed, one win and seven top-10 finishes. The 14th is suddenly looking like it could be a huge hole, it's Spieth to go first with wedge... hooked it, that's pretty ugly, Day back in the box seat, despite being in sand...
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It's the par-four 14th now for Day and Spieth and it's the American's honour... safe as houses... Day is going with driver and he's found the bunker out left, a mystery as to why he didn't go with three wood, but the mind becomes a cloudy place once the pressure starts seeping in...
Day -19 (13), Spieth -16 (13)
Plenty more chicken on that bone for Day at 13, Spieth has a 10-footer for birdie... bent it in, he moves to -16. That puts more pressure on Day's putt for par but he makes light of it, rolling in a five-footer to stay three clear...
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Kopeka -14 (16)
Brooks Koepka is putting some round together, a birdie at 16 has taken him to -7 for his round and 14 under for the week. The world number 20 is having a very good season, having won his first PGA title in February. By the way, if things stay as they are, Jordan Spieth will end Rory McIlroy's stint as world number one.
McIlroy -9 (69)
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Rose on tee at 14 after that double at 13 and it's straight down the middle. McIlroy at the last and he's in for a 69, nine under and tied for 16th as it stands. Not bad at all from the world number one, having snapped his ankle in half six weeks' ago, that's four under-par rounds.
Day -19 (12), Spieth -15 (12), Grace -15 (13), Rose -14 (13)
Here's Paul Casey of England, making par at the last for a two-over 74 and -4 overall. Day's second at 12 and it's a peach, he's got a four-footer for par. That's really not very good by Rose at 13, hands of a blacksmith from just off the green and he's got a longun for bogey. Spieth can't make the birdie putt at 12, stays four back. Day in for par, stays four clear... Rose did indeed make double, that's him dead... Grace leapfrogs him with a birdie...
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Day finds the bunker at the par-three 12th, looks like the wind took that. Spieth with a chance to close the gap... all over the flag, that was ballsy, he's got a chance of a birdie while his playing partner is trapped. This could be Rose's race run - horror lie in a bunker up at 13 and he can only just nudge over the rim.
Mickelson -8 (69)
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I think we have officially entered Chokesville territory, if Day gives up a four-shot lead with seven to play, he will forever be remembered as another Aussie who threw a major away. A 69 for Mickelson today, and another top-20 finish in a major, as things stand.
Day -19 (11), Spieth -15 (11)
Spieth for birdie at 11...shovels it out right, that wasn't great. Day with a five-footer for birdie and in it goes, he leads Rose by three...
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Day's eagle attempt at 11 stays left of the cup but he should pop in for birdie and a three-stroke lead over Rose in second. Here's Rose at the par-four 13th, he's tugged it slightly, but it's not too dramatic, despite his reaction...
"Rose is playing quite beautifully. He's picked up four shots through his 11 holes today, no bogeys. He does have a good record of coming back from behind to win tournaments, he's done it four times on the PGA Tour."
Rose -16 (12), Grace -14 (12)
Rose has got a look at the par-three 12th, Grace is a bit juicy and hops through the green. This isn't pretty for Spieth, his ball is buried quite deep in some wispy stuff, but he's clipped one to within about 10 feet of the cup. Day, however, is putting for eagle... Grace makes par at 12, stays -14, Rose's birdie attempt wanders right of the hole...
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Spieth from the light rough at 11 and his ball has ricocheted off the ridge of the bunker protecting the front of the green and into some cabbage. A few more yards carry and he would have been putting for eagle. Day safely on in two, this is looking like a make and break hole...
Finau -10 (12)
A triple at nine took the sails out of Tony Finau's challenge but he's doing his best to dig his way back, he's just made eagle at 11 to get to 10 under again. George Coetzee of South Africa has birdied the 15th to get to 11 under, currently in a tie for sixth.
Rose -16 (11)
Day on tee at 11 and he creams one, that's strong and long. Birdie for Rose at 11, he's two back...
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Spieth has made two birdies at 11 in the last two days but he's found rough with his tee shot today. Rose at 15, third shot, and it's a beauty. He's got a very makeable putt for birdie to get to within two of Day. Grace fires his bump and run through the green...
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Spieth -15 (10)
Jay Townsend
Former American professional golfer on BBC Radio 5 live
"You never make up for a bogey it's on the card but you do make a birdie, that's a separate incident. The birdie gets you just that, you never get the bogey back."
Day -18 (10), Spieth -15 (10)
Spieth takes a while to settle over his putt before bending it in, he gets to 15 under and is three behind Day, level with Rose.
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Rose with a horror lie in a bunker at 11 and all he can do is nudge it back onto the fairway. McIlroy over at 16 and he's into the guts of the green in two. Day has got 10 feet for birdie at 10 and leaves it short. Spieth has a foot in the door, can he blast it open with a birdie?
Birdie
D Johnson -10 (11)
What goes through the mind of this man?
Dustin Johnson made quadruple bogey on the first hole and two more bogeys before the fifth hole. Did he crumble? Nope.
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Five birdies and an eagle later he's on 10 under. Just imagine if he'd started solidly, he'd be right in this.
Major Sundays are never dull with this guy.
Johnson -11 (12)
A two for Dustin on 12, he's back to -11 - were it not for that quadruple at the first, he'd be right in the mix. As it is, his reputation as a swallower continues to grow, however fairly or unfairly.
Steele -10 (67)
Increasingly it's looking like only three men in the field are close enough to take down Day - Rose of England, Grace of South Africa and Spieth of the United States. Steele in with a 67 for a share of the clubhouse lead on 10 under.
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Thanks Luke, this is Ben Dirs again, until the close I believe. I appear to have put the kybosh on Kaymer with a bet before start of play, he's the only man in the top 15 over par. Sorry, Germany. Spieth on tee at 10, going with the big stick, and he melts one down there. Day, alas for Spieth, had already done so...
Double bogey
Rose -15 (10), Day -18 (9), Spieth -14 (9), Grace -14 (10)
Suddenly people are faltering, Jordan Spieth makes bogey on nine, his par putt slides away. Branden Grace is collapsing on 10, fluffing a chip from the rough to leave his fourth shot on this par four from the ugly stuff. He has a bogey putt but leaves it short and it's double.
Farewell Branden perhaps. If Jason Day can make par now he gains big time... he does. Well judged.
So over to you Justin Rose, this is a putt for birdie, second on the leaderboard to be three off the lead... straight in.
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Spieth -15 (8), Day -18 (8)
Jason Day becomes a club hacker very briefly, hacking into the turf several inches behind the ball. He caught that one fat to say the least and from a perfect position on the ninth fairway he now has a tough pitch to get up and down for par on nine.
To quote former England manager Graham Taylor, "this is a test". Beautifully judges to leave six feet. Jordan Spieth leaves a similar putt. Neither man will fancy these.
Eagle
Kuchar -13 (11)
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Matt Kuchar gets the "Kooochh" call from spectators. Why? He sinks a short putt on 11 for eagle. Incredibly he's now on 13 under and in fifth place.
"If it does go to a play off it would be a three-hole play-off using holes 10, 17 and 18."
You can listen to Iain Carter, Jay Townsend and Eilidh Barbour on BBC Radio 5 live right now by clicking the live coverage tab at the top of this page.
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Spieth -15 (8), Day -18 (8), Grace -16 (9), Rose -14 (9)
Jordan, oh Jordan, stop pointing right off the tee box. His ball finds the thick rough and on this ninth hole, that's problems as the green is hidden away. Jason Day likes what he lampoons up the fairway - that's prime location. You have to find the fairway on these harder holes so you can generate spin to hold the ball on these greens.
On the green, Branden Grace and Justin Rose are in for pars. That's a great up and down for Rose.
Bogey
Day -18 (8), Spieth -15 (8)
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Jordan Spieth has bang on 30 feet left on eight and it will break late to the right, it does, the weight is perfect and... and... won't drop. It trickled across the front of the cup and he dances on the spot and begs it to drop.
Jason Day cannot convert his par putt, that wayward drive claims a stroke.
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Rose -15 (8), Grace -16 (8)
Justin Rose, head bowed, talks to himself and these are words of anger. His ball on nine rips off the club but he starts waving his hands in protest immediately. Bounce, bobble, bunker. And he's short sided so getting out of that trap and near the pin will take a minor miracle. Bogey is very much in play.
Branden Grace is on the green and has an outside birdie chance. He has to post a number as Jason Day isn't going to come backwards through this field.
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Day -19 (7)
Don't speak too soon. He has to play out sideways from a bunker on the eighth and has 156 yards left into this flag for his third - it's a par four. It looks like a full swing and it makes the putting surface but leaves 20 feet. Could be bogey.
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Day -19 (7), Spieth -15 (7), Grace -16 (8), Rose -15 (8)
Jason Day finds bunker from the tee on the eighth which at over 500 yards will now ask him a question or two. Jordan Spieth is position 'A' but he needs to find something big now - three back. Up ahead on the green, Branden Grace and Justin Rose must have heard the noise generated by Day's putt on seven - they make pars. That putt from Day was something else. He can't lose it from here can he?
Birdie
Day -19 (7), Spieth -15 (7)
This is the moment, this is the moment we will look back on surely. Jason Day has over 40 feet to the pin on this seventh green. He has to be kidding us. What a putt. What a body blow, incredible. The Australian bounces off to the next tee and doesn't even watch Jordan Spieth make par. The adrenaline running through his body could fuel your car for the next week.
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American golf journalist Alex Miceli on BBC Radio 5 live: "I anticipated that it would be hard to score because of the hole positions but the one thing you can learn from this tournament is that it really doesn't matter if the scoring is low, as long as the golf is entertaining."
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Rose -14 (7), McIlroy -9 (13)
Justin Rose looks disgusted on the eighth hole as he leaves a long way for birdie.
"You can't expect to land it any softer than that, it's a wedge, that's my fault," says the man on his bag.
Rory McIlroy must get up and down from the bunker on 13 if he is to stay at nine under. McIlroy is three under today and looking solid but his chip here leaves 20 feet for par. Could be one back for the course here. He's currently tied 15th.
Grace in touch with history...
Grace -16 (7)
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If Branden Grace could keep this up, he could become only the second South African to win the USPGA. Gary Player won it twice, in 1962 and 1972. He would also become the seventh South African to win a major. But let's not get ahead of ourselves, he's currently two behind Day...
"Get in the hole", goes the cry from the spectators as Jordan Spieth whips one out of the rough on six. It nears the hole, this would be eagle... the roars grow and grow and then comes "ooohhh". Just two inches the wrong side of the cup and a birdie putt will follow.
Jason day must make birdie from where he is on the green, it's four feet. AND WE HAVE A FIST PUMP - it's Branden Grace on seven. He drains the life out of a 15 footer for birdie - three in a row. Want another birdie? Fair enough - Anirban Lahiri on nine with a lengthy putt.
Back to Spieth... nails it. Dear me this is like a birdie disco, the lights are blinding me... Day... birdie. He responds to everyone trying to haul him in.
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Day -17 (5), Spieth -14 (5)
Jason Day gets a juicy kick out from the rough on six. He will surely make birdie here as this hole is as easy as they get at this level. His tee shot is left of the fairway but kicks back onto the lovely short grass. Jordan Spieth is shouting "left, left" at his ball as he tries to drive this green. Such a big ping off his club face and he goes through the green but has nice position.
I can tell you Justin Rose and Branden Grace have hit solid shots into the seventh green off the tee - birdie hopes grow.
Birdie
Rose -14 (6), Grace -15 (6)
Phil Casey of the Press Association gives his view as both Branden Grace and Justin Rose make birdie on this very welcoming hole. They both hit it further than the average 285 yards Y.E Yang has managed of the tee in this tournament.
Birdie
Day -17 (5), Spieth -14 (5)
Spieth... right to left with mild break... super, super putt for birdie. That could be key, it ramps up the pressure on Jason Day who places his ball on this green.
Get that out of your mind Jason, play your own game... it's nine feet in all, deep breath... hugs the edge of the cup and gravity takes it. Birdies all over.
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Spieth -13 (4), Day -16 (4)
Ugly, ugly ball for Jordan Spieth. It sits in rough at a crucial stage on this par five. His third shot will have to be inventive and he pumps it along to run to the flag but it's short.
In this game of chess Jason Day can get in closer than his rival here. Day is middle of the fairway with a wedge in his hand and he leaves six feet for birdie. The lead could grow here. Day is inviting the punches and countering.
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Rose -13 (5)
Jay Townsend
Former American professional golfer on BBC Radio 5 live
"Justin Rose is doing the exact right thing in just trying to chip away at this lead."
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Finau -12 (6), Grace -14 (5), Rose -13 (5)
Tony Finau continues to refuse to go away. This big fella - 6ft 4in - shows gentle touch as he chips on the par-four fourth to leave a tap-in birdie.
Justin Rose and Branden Grace follow him up that hole and the green is reachable off the tee here. Neither make it but their balls are well positioned.
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Moore -3 (18), Chappell -2 (18)
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There are two players in the clubhouse sharing the best score of the day so far. American pair Ryan Moore (pictured) and Kevin Chappell shot five under - 67.
Birdie
Grace -14 (5), Rose -13 (5)
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Here's a man looking like he has the putter on flames... Branden Grace. What a stroke on five, it's long, breaking and in from 33 feet.
Is Justin Rose's putter toasty? You bet. No slippery margarine in sight here, straight in.
"Go hard please," says Jason Day as he tees off on the fifth - a par five - bunker time. Lots of room to haul that back on this long hole.
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Bogey
Spieth -13 (4), Day -16 (4), Rose -12 (4), Kaymer -10 (5)
Jason Day will feel good as he sees Jordan Spieth make just bogey on four. A three-shot gap with 14 holes to play in a major - he'd have taken that on Thursday.
Martin Kaymer shows some steel to par five after finding trouble and he stays in this... just. Justin Rose is coming up the par-five's fairway behind him and walking confidently as he sets up a great birdie chance. These are the ones that have to go in...
Stricker's last?
Stricker -4 (18)
Golf Channel writer Randall Mell brings us Steve Stricker after the 48-year-old finished on four under...
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Spieth -14 (3), Day -16 (3)
Do my eyes deceive me? Jordan Spieth under hits his par save on four by some distance by his standards and he will make bogey at best. Jason Day, to land a huge blow for birdie from range... no. Never on the right line. It was a timid effort to say the least but par scratches another hole off.
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Spieth -14 (3), Day -16 (3), Kaymer -10 (4)
Jordan Spieth will need to get up and down to save par on the fourth. It's a touch over 100 yards for him but with his wedge game, he can place a ball on a bit of dust when needed... not this time though as he goes over the flag to leave 25 feet for par. Far from ideal with Jason Day on the dance floor with a lengthy birdie putt to come.
Martin Kaymer, has he surrendered after his double bogey? Looks like it, over the green on five with his third. You have to bank the par fives today and he may only end up with par at best.
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Cheers Ben. Thoughts on the early jabs folks? Keep in touch with us on #bbcgolf.
Is this a straight contest between the top two or can someone win this from outside of the lead group?
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Rose putting for birdie from the fringe at four... come up a couple of revolutions short, he stays -12. Bjorn with a rare two at 17, but he's a mile back on two under. I'm going for a break, here's Luke Reddy for a bit...
Kuchar -10 (5)
Kuchar birdies five, gets to 10 under. Spieth tugs his tee shot into a bunker at four, that's Kaymer country, and he walked away with a double. Day made bogey at four yesterday but he's melted his drive down there today, he could be increasing that lead again...
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Spieth -14 (3)
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Spieth -14 (3)
Jay Townsend
Former American professional golfer on BBC Radio 5 live
"That was a great birdie two at that difficult par three. Jason Day holed a really nice par putt too, probably more difficult than Spieth's. It looks like both guys are under control of their emotions so far. As we creep nearer the 18th hole, that's where the nerves ratchet up a little more."
Day -16 (3), Spieth -14 (3), Lahiri -11 (5)
Lahiri drains a birdie putt from range on five, moves to 11 under. it's Day to go first, this is a ticklish one... makes it drop, it wasn't as far as eight feet, but he still needed to do a job on it. Spieth for his 86th birdie this year in majors, needs this... and gets it, moves to -14 and back to within two of Day.
Kaymer -10 (4)
Matt Kuchar (after four) and Brooks Koepka (after six) have moved to nine under, but that's now seven off the lead. Finau with a fine saver at four, the American stays 10 under. Day with that monster putt at three and he's raced it eight feet by. Spieth can make it a two-shot swing here... Kaymer doubles the fourth, drops to -10...
Ouch!
Johnson -4 (4)
Dustin JohnsonCopyright: Dustin Johnson
Positivity is a must for any golfer but Dustin Johnson's tweet on Saturday night has proven quite inaccurate. The American is five over par for his round after four holes.
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Kaymer can only nudge his ball forward at the fourth, it's damage limitation from now on. Day at the par-three third... draws it a little bit too far, onto the fringe. Spieth stiffs his to within four feet of the cup. Whatever you can do... Kaymer has got about seven feet left for bogey at four, could be two shots gone.
Day -16 (2)
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It would be harsh to say Jason Day's 'nearly man' tag is due to his nerves getting the better of him - the term 'bottler' is certainly unfair.
In placing second at the 2013 US Open he came from eighth place after round three but fell two shots off winner Justin Rose.
At the 2011 US Open he again finished second but stood no chance as Rory McIlroy led by a mile going into the final day.
And at the 2011 Masters, Day posted 12 under with Adam Scott but Charl Schwartzel birdied the last four holes to win by two.
Day makes birdie at two, opens up a three-shot lead over Spieth and Grace...
Grace -13 (3)
Kaymer gambling at four, thrashing out of the rough with three wood and finding sand. Spieth has a 10-foot par for birdie at two... borrows an inch too much, stays -13. Day with a chance to go three ahead, as Grace bombs in a longun at three to join Spieth on -13. Rose makes par, stays -12.
Stenson -7 (11), Lingmerth -9 (13)
Sweden's Henrik Stenson eagles 11, goes seven under. Fellow Swede Lingmerth has got his mojo working again, another birdie at 13 and he's five under today and nine under overall. Day with a fine bunker escape at the second, birdie chance...
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Spieth going with hybrid at two - out goes the hand but no need, he's popped back onto the fairway. Day going with three wood, throws the kitchen sink at it, and finds a green-side bunker. Only three men have hit that green in two today. Rose into the guts of the green at the par-three third...
Kaymer -12 (3)
No-one has made a significant move at the top of the leaderboard so far, the only man in the top eight who is under par is India's Anirban Lahiri, after three. Rose buzzes the hole with his birdie attempt at the second, stays 12 under. Kaymer pops in for birdie at the third, he moves to 12 under and three off the lead...
What a shot!
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Kaymer on tee at the par-three third... what a shot that is, he's got a five-footer for birdie. England's Paul Casey is level through seven and six under overall...
Day -15 (1), Spieth -13 (1), Kaymer -11 (2)
Victor Dubuisson is five under for the day through 12 and eight under overall. Day makes par at the first, stays two clear on -15, as Spieth also makes par. Kaymer with a beautifully paced birdie attempt at two, taps in for par to stay -11.
Rose & Grace -12 (1)
Day with his second into the first, safely on. Spieth leaves himself with a better chance of a birdie, but Day also has a chance. Rose and Grace kick off with pars, stay 12 under...
'Going to need a shark attack'
Horschel -6 (3)
Breaking news... Billy Horschel - started eight under - shared the design on his trousers with the world of Twitter but after a double bogey on the second, his mood may now not be as vibrant.
Billy HorschelCopyright: Billy Horschel
Horschel tweeted: "Going to need a shark like attack to win today! What do you think about the pants Greg Norman?"
Norman, nicknamed 'The Great White Shark' replied: "Love your style and w/pants like that Attack every hole and go low. Good luck. Play hard."
Lingmerth -8 (11), McIlroy -8 (7)
Lingmerth has got another one of those spurts going, three birdies between eight and 11 and he's back to -8. Kaymer with his third at two and he's off the front of the green, he'll need all his touch to make par from there. McIlroy makes it birdie-birdie at the seventh, gets to eight under...
Spieth and Day away
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Day, decked out in black shirt and grey slacks, narrows his eyes and composes himself, stalks his ball, before bending his drive over the bunker and onto the middle of the fairway. Spieth, in blue and grey, follows him down there...
McIlroy -7 (6)
Here they come, the main event of Day and Spieth. These two also played together on the final day of this year's Open - both men needed a birdie at the last to make the play-off, and neither man could manage it. Rose from the middle of the first... cosies his ball up behind playing partner Grace, both men with birdie chances. McIlroy makes birdie at six, gets to seven under.
Kaymer -11 (1)
Kaymer for birdie at the first, from eight feet... just grazes the hole left, he stays 11 under and four back. Louis Oosthuizen in with a 69 for four under.
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Whistling Straits is where it all began...
Day -15 (19:45 BST)
This will be one of the lasting images of the 2015 US PGA Championship...
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And make no mistake, Jason Day feels right at home here. Much has been made about his nine top-10 finishes in majors but the first of those arrived at Whistling Straits in this tournament five years ago.
How has he reached this point this week? Good length off the tee - an average of 306 yards. Accuracy off the tee - finding the fairway pretty much three times out of four. And, finally, hitting the green with 78% of his attempts.
It's been classy and this man who knows how to go close, may finally get it done.
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Here's Branden Grace with his drive at the first, safely away. Justin Rose, the lone hope of the United Kingdom, pings his drive down there and gobbles up Grace. Both men in position A1.
He hit it how far?
Watson -7 (13)
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McIlroy can't get anything going today, he's started with five straight pars and he really needed to come exploding out of the blocks to have any hope at all. Kaymer with a fine bunker escape at the first, as I hear that Dustin kicked off with an eight, which saw him drop into a tie for 29th.
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Bubba bends in his birdie putt after that monster drive at 13 and he's now seven under. Kaymer gets his drive away at the first, as Johnson finally gets his ball on the green up ahead with his fifth attempt. Shades of Tommy Nakajima....
Now on the tee
Kaymer -11 (19:27 BST)
Martin Kaymer won the US PGA at this course five years ago on a day when, like today, he began his round four shots off the pace.
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Kaymer loves it here and has said Whistling Straits is the best course he has played in America, so there are plenty of reasons why he can come up trumps.
That's ugly!
India's Anirban Lahiri has birdied the first and is 10 under, five off the lead. Dustin Johnson making a real mess of the first, he's just left two bunker shots in the trap... make that three... I'll keep you posted, suffice to say he won't be breaking his major duck this week.
Bubba Booey
Bubba's having a go today, and it's having mixed results - bogey, bogey to start, birdie at five, eagle at the par-four sixth, three birdies from 10 to 12th. As I write, he's just driven his ball through the back of the 13th - that's 430 yards. Difficult to get your head around to be honest.
What a shot!
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Another birdie for Justin Thomas at the fifth, he moves to nine under par. And here's Mickelson, splashing in for eagle at six! Lefty had missed a few chances before that, but look at that face, the befuddled grin of a man who doesn't quite understand how he manages to do what he does. He's seven under.
'No margin for error'
Rose -12 (19:36 BST)
Justin Rose talks to Sky Sports: "Yesterday was all about staying in position. I've done that. I'm a few back but there's a chance. The breezy day should make it interesting. If one of the chasing pack post a score it will make it tough for the leaders.
"There's no margin for error with the wind up. Hopefully my ball striking will carry me through."
What score could get the job done? "In the 60s, maybe 68 on the higher end of things. We'll see what we can do."
Lead not always prime spot
Day -15
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Read and listen...
BBC Radio 5 live from 20:00 BST
All you need to digest on this final round of the US PGA Championship will be in this live text and on BBC Radio 5 live.
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Golf correspondent Iain Carter is joined by former European Tour player Jay Townsend and Eilidh Barbour from 20:00 BST. You can listen through your radio or by clicking the live coverage tab at the top of this page.
'I'm really excited'
Day -15, Spieth -13 (19:45 BST)
Jordan Spieth is on the putting green, he's like a well-oiled factory machine. Putt... in... putt... in. He's working on the line of his stroke and the man on his bag Michael Greller is charged with collecting the balls from the cup.
Jason Day is on the range hitting irons with a big pile of balls. These are crucial times for these players, get that swing loose, kick any clutter out of the mind, deep breaths. They will tee it up in under 45 minutes.
Day tells Sky Sports: "Right now I've just got to focus on the process and get the preparation correct.
"I'm really excited about today, it's going to be a lot of fun. The challenge of playing against Jordan and the guys behind. It'll be tough, the wind is up but to make it as stress-free as possible will be nice."
Jordan's midnight run?
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A quick reminder that should Jordan Spieth win tonight he will become world number one.
And, if he or any of his compatriots lift the Wannamaker Trophy, the United States will be home to all four major champions in a season for the first time since 1982.
To take your mind back to 1982 briefly, in August of that year, Dexys Midnight Runners topped the UK charts with 'Come on Eileen'. Tune.
Pumped and ready
Day -15 (19:45 BST)
Steele -8 (6)
Sergio Garcia's hunt for a major continues, the Spaniard, who announced himself to the world by duelling with Tiger Woods at the 1999 US PGA, is in with a 70 for level par overall. Brendan Steele of the United States birdies four, five and six and is eight under, joint lowest on course.
Thomas -8 (3), Schwartzel -7 (3)
Justin Thomas, he of the radioactive trousers, is two under after his first three holes and the lowest currently on the course, eight under. Former Masters champion Charl Schwartzel birdies three to get to seven under, McIlroy pours in a good saver to remain six under.
What does the winner get?
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The winner today will pick up a whopping $1.8m. That's around £1.15m. This season, Jordan Spieth has pocketed close to £6m in prize money alone, and you can bet those blue chip companies are fighting to throw more money at him.
Oosthuizen -5 (14)
England's Paul Casey at three and he stiffs his tee shot to within eight feet. McIlroy for birdie at two but it dies at the last moment, he stays -6. Louis Oosthuizen, who lost out in a play-off at this year's Open, is four under after 14 and five under for the week. The South African was fancied this week but has left his charge too late.
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An ugly end to the week for England's James Morrison, who carded a 78 today. The Surrey golfer is propping up the leaderboard on nine over, although just making the cut on debut is something to be proud of. Many great players didn't. It hasn't been a great year for French Ryder Cup star Victor Dubuisson but he's having a good US PGA - he's three under after seven and six under for the week.
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McIlroy parred the first and here he is going for the green in two at the second... finds a horrible little bushel. There's a 15mph wind out there and not many going low, but good scoring is possible - Steve Stricker is five under after 12 and seven under overall, Ryan Moore and Kevin Chapell are in the clubhouse after 67s.
The state of play
Australia's Jason Day, who has a host of near misses in majors, leads on -15, two ahead of American Jordan Spieth, who is bidding to become only the third man to win three majors in the same year, after Ben Hogan and Tiger Woods. South Africa's Branden Grace and England's former US Open champion Justin Rose are one further back, one ahead of Germany's Martin Kaymer, winner of the tournament the last time it was played on this course in 2010.
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Day and Spieth go off last at 19:45 BST, Grace and Rose at 19:36, Kaymer and American prospect Tony Finau at 19:27, American Dustin Johnson and Australia's Matt Jones at 19:18. World number one Rory McIlroy, nine shots back overnight, teed off at 18:15. Who's your money on?
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Evening. Welcome to the final day of the final major championship of 2015, the US PGA at Whistling Straits, Wisconsin. After a chaotic moving day on Saturday, when a gaggle of players with sharpened elbows jostled for position ahead of the final straight, Sunday promises high drama...
Live Reporting
Ben Dirs
All times stated are UK
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Latest PostPost update
Righto, I think that might be time to say goodnight. Well done Jason Day, no longer the best player never to win a major championship. And nobody handed it to him, he went out and won it.
'I've got to soak it in'
Jason Day speaks to Sky Sports: "You guys saw on the 18th hole, even before I finished I had tears coming out of my eyes. I don't need to think about anything else now, it's such a special moment. I've just got to soak it in.
"I drove the ball so good and hit a lot of greens. I was patient in myself and disciplined. Everything mixed together it worked out perfectly."
Post update
So, that's the 2015 major championships done and dusted and we got three quality winners. It's exciting times for golf, we have a new world number one in Jordan Spieth, who is only 22; an old number one in Rory McIlroy, who is only 26; a new major winner in Jason Day, who is only 27. Chuck in lots more coming men, and golf is looking fresher than for a long time.
The champion speaks...
Jason Day addresses spectators in his first interview at the side of the 18th green: "It's been a long journey. I didn't expect to ever grow up and be on the PGA Tour, it's an amazing feeling.
"I didn't expect I was going to cry. A lot of emotion has come out just because I've been close so many times and fallen short. To be able to play the way I did today in tough conditions with Jordan in the group. He was the favourite, to be able to play the way I did was amazing.
"Overall I'm just really pleased with how I played, I couldn't ask for anything better."
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Brian Gaffney gets a glass bowl for being the lowest club pro, he finished on +5 after a 71 and was the first club pro to make the cut since 2011. And now Jason has the handsome Wanamaker Trophy in his mitts. Up it goes, the Queenslander deserves it, he's grafted like a dog to land a big one and after so many near misses, his dream has finally come true.
'Can't have better'
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I should add that Jordan Spieth, having won the Masters and the US Open this year, finished joint fourth at the Open and second today, is the new world number one, displacing Northern Ireland's Rory McIlroy. A lot of people seem to have found it difficult to comprehend that the Age of Tiger is over, but with Woods having missed a third successive major cut and not won one since 2008, I think we can now say with some conviction that we are in the post-Tiger era. And it looks quite exciting...
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Iain Carter
BBC golf correspondent on Radio 5 live
"When you think back to the US Open, with the attack of vertigo and we really feared for Jason Day's health, it's an extraordinary story."
Day -20 (67), Spieth -17 (68), Grace -15 (69), Rose -14 (70)
So, Jason Day is the first Aussie since Steve Elkington in 1995 to win the USPGA and only the fifth Aussie in all. He is also the 11th Aussie winner of a major. His -20 total also breaks the record for the lowest under-par total in a major, beating Tiger Woods's -19 at the 2000 Open.
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Jay Townsend
Former American professional golfer on BBC Radio 5 live
"It was a wonderful effort. he was pretty much in control all day. He never really looked like he was wobbling. The only time was the second shot on nine and the he went on to save par, that was a huge turnaround, a big turning point in the day."
JASON DAY WINS THE US PGA
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Iain Carter
BBC golf correspondent on Radio 5 live
"There is not a dry eye in the house as Jason Day becomes a major champion. His son runs onto the green. It's dad and son as they celebrate a major victory which has been a long time coming."
DAY WINS THE US PGA
And Day pops it in - finally he's bagged one of the big ones, after nine top-10 finishes. Tremendous stuff, and not before time.
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Iain Carter
BBC golf correspondent on Radio 5 live
"Day is in floods of tears, it's a good job he only has a six-inch putt to knock in."
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It's some setting for a maiden major, the sun beginning to lower over Lake Michigan and the galleries full to the brim. Day's wife, Ellie, and son, Dash, await him behind the green. As is usually the case when an old man does something he thinks is very special, his little boy is far more interested in a disc his mum is waving in front of his face. He'll understand one day, he won't be able to miss the Wanamaker Trophy stuck on top of the TV. Day cosies the ball up towards the hole before breaking into tears, breaking your duck can be a little bit overwhelming.
'Great dude'
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Spieth with a fine approach at 18, from about 200 yards. Day now, from 184 yards, and it's safely on. Day pretty much home and hosed...
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Grace -15 (18)
Iain Carter
BBC golf correspondent on Radio 5 live
"Well done Branden Grace, $680,000 will land in his bank account."
Listen to the final strokes of this championship on BBC Radio 5 live by clicking the live coverage tab at the top of this page.
Grace -15 (69), Rose -14 (70)
Rose's par effort is majestic, but it had too much work to do. It's a bogey at the last for the Englishman, a round of 70 and -14 overall. Grace pips him for third with a par, the South African finishes one ahead of -15.
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Day -20 (17)
PGA Tour writer Brian Wacker surveys the scene at Whistling Straits...
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Rose with his third at 18 and he's left it well short, coming out of some rubbish. Will do well to make par from there. Here are Day and Spieth marching down the 18th, as up ahead Grace putts for birdie... that's not great, he's got a knee-knocker for par...
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Grace into the heart of the green at the last, he's vying with playing partner Rose for outright third. Spieth finds the collar of the fairway with his drive at 18, Day gets chocs away with his driver after what seems like an age... hammers it, just one more good swing and he's home and dry...
Day -20 (17), Spieth -17 (17)
Spieth from a little closer than Day but he doesn't get the pace right, he's got a nervy one for par. Spieth is a very likeable chap, some of his little exclamations have a comic book innocence about them, so the fans are pleased to see that par putt finally get gobbled up after circling the drain. Day makes par, stays three clear.
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Day with a huge birdie putt at 17... the thumbs up from Spieth tells you everything you need to know, it's a corker, he'll tap in for par to stay -20...
Day -20 (16), Spieth -17 (16)
Day gives a little puff and a growl before addressing his ball at 17 and finding the guts of the green. At this stage, that's all he needs to do. Spieth also on, he pretty much has to stick his long-range birdie putt in before making another birdie at 18, and even then he probably won't win it...
Grace -15 (17), Rose -15 (17)
Birdie for Grace on 17, he joins playing partner Rose on -15 and a tie for third. Dustin in with a 69 that included a quadruple eight and two eagles. Never let it be said that Johnson serves up the predictable.
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Day -20 (16)
Jay Townsend
Former American professional golfer on BBC Radio 5 live
"There's around about 800 yards of golf to play but looking ahead I think it'll be a really emotional 18th green when Jason Day gets that major win."
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Day -20 (16), Spieth -17 (16)
Day knows he's got it now, it's all in the eyes and the little smirk on his lips. In goes the birdie, back he goes to -20. Spieth follows him in, stays three behind with two to play...
What a shot!
Spieth spends plenty of time examining his bunker shot at 16, breaking off to tell his caddie: "This is a hard shot..." Eventually he hits it and sticks it to within three feet. When the fat lady's singing, wherever that may be, Spieth will still be swinging. Day putting for eagle, however, and he misses by a couple of inches...
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Day -20 (16)
Iain Carter
BBC golf correspondent on Radio 5 live
"This eagle putt for Jason Day, this is a big moment, were this to go on I think his fat lady would be singing merrily."
You can listen to Iain Carter and Jay Townsend by clicking on the live coverage tab at the top of this screen.
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Lahiri -13 (18)
Jay Townsend
Former American professional golfer on BBC Radio 5 live
"A fantastic week for Anirban Lahiri who has won twice on the European Tour this year. A fantastic talent and his game is just growing all the time."
Lahiri -13 (68)
Branden Grace with a crackerjack tee shot at 17, having missed a three-footer for birdie at 16. Lahiri is in with a 68 after a bogey at the last and has a share of the clubhouse lead. Currently tied for fifth, that makes it the best finish by an Indian in a major, beating Jeev Milkha Singh's tied ninth at the 2008 USPGA.
Koepka clubhouse leader on -13
It's a final-round 66 for Koepka and he leads in the clubhouse on -13. Spieth with an iffy second at 16, he's tugged it into the bunker. Advantage Day, as if he didn't have it already, and that advantage grows after a sweet approach, he's got a makeable putt for eagle to close the deal...
Aussies at the USPGA
Day -19 (16)
Day would be the 11th Australian major winner, and a Day victory would be Australia's 17th major in all. Four Aussies have won the USPGA - Jim Ferrier won at Plum Hollow in 1947, David Graham at Oakland Hills in 1979, Wayne Grady at Shoal Creek in 1990 and Steve Elkington at the Riviera Country Club in 1995.
New world leader?
Spieth -16 (15)
Rose -15 (16)
Rose for birdie at 16 and he pours it in to get to -15, four off the lead. Spieth has birdied the 15th all three days and he might do so again after an unerring drive. Day has given his drive a serious ragging, that's pitched 300 yards down there...
Day -19 (15), Spieth -16 (15)
Spieth doesn't really get close with his long-range birdie attempt at 15, Day in for bogey after his birdie attempt skips over the cellophane bridge. Spieth makes it 58 holes without a three-putt to trim the lead to three shots...
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Why Dustin, why?! Like Sisyphus rolling the boulder up a hill, he worked his way back up the leaderboard after an eight at the first but has just let the boulder slip, very nearly sticking his tee shot in the drink off tee at 17... he's on in two, but has got about 40 feet for par...
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Snedeker rounds off his round with a 75-foot putt... for par! That's a 69 for -10 in the clubhouse for the world number 30. Day to go first at 15, from just off the green... comes up well short, he's got a 15-footer for par. Alas for Spieth, he's putting from about 80 feet...
Coetzee clubhouse leader on -12
George Coetzee of South Africa is in with a 67 for the clubhouse lead on -12. Spieth with 192 left at 15, six iron... his ball doesn't do what he tells it to and it comes up short. Day fizzes his second out of the rough and over the back, but he should get up and down from there.
Footballers take in the action
It wouldn't be a major championship if a few footballers weren't taking in golf drama and uploading their views onto social media.
Raising the bar...
Day -20 (14)
Johnson -13 (16)
Remarkable performance by Dustin Johnson today - quadruple at the first, five over through four, but he's just made his second eagle of the day at 16 to get back to 13 under. 'Oh, what could have been' could end up being his epitaph. Day misses the fairway left at 15, but it looks OK. Spieth pings his drive bang centre...
What stands between Jason Day and glory
Day -20 (14)
No. 15 - 'Grand Strand' - the fourth hardest hole on the course this week.
No. 16 - 'Endless Bite' - the easiest hole on the course.
No. 17 - 'Pinched Nerve' - sixth hardest hole on the course.
No. 18 - 'Dyeabolical' - the hardest hole at Whistling Straits this week.
Post update
Day -20 (14)
Iain Carter
BBC golf correspondent on Radio 5 live
"He's leading by four. In charge of the final major of the year."
Day -20 (14), Spieth -16 (14)
Rose very nearly chips in at 15, Spieth keeps the tournament alive with a sweet right-to-lefter for par at 14. This kid is tough as teak, that was from about 20 feet. Day with a birdie putt for a four-stroke lead with four holes left... squeezes it in, it's his to lose now...
Lahiri -14 (16)
Rose with a very awkward lie at 15, feet in sand, ball on a hillock about three feet above his feet. Spieth can only flop out 20 feet past at 14, he's got a longun for par, with Day putting for birdie. Here's Lahiri with a birdie at 16, he's 14 under and doing his bit for the game of golf in India...
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... Day has found the dancefloor with his second at 14 - with Spieth scrabbling about in some nonsense, that could be game, set and match...
Streb clubhouse leader on -11
Robert Streb has the clubhouse lead on 11 under after a second successive 67, he's having a very good season indeed, one win and seven top-10 finishes. The 14th is suddenly looking like it could be a huge hole, it's Spieth to go first with wedge... hooked it, that's pretty ugly, Day back in the box seat, despite being in sand...
Post update
It's the par-four 14th now for Day and Spieth and it's the American's honour... safe as houses... Day is going with driver and he's found the bunker out left, a mystery as to why he didn't go with three wood, but the mind becomes a cloudy place once the pressure starts seeping in...
Day -19 (13), Spieth -16 (13)
Plenty more chicken on that bone for Day at 13, Spieth has a 10-footer for birdie... bent it in, he moves to -16. That puts more pressure on Day's putt for par but he makes light of it, rolling in a five-footer to stay three clear...
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Kopeka -14 (16)
Brooks Koepka is putting some round together, a birdie at 16 has taken him to -7 for his round and 14 under for the week. The world number 20 is having a very good season, having won his first PGA title in February. By the way, if things stay as they are, Jordan Spieth will end Rory McIlroy's stint as world number one.
McIlroy -9 (69)
Rose on tee at 14 after that double at 13 and it's straight down the middle. McIlroy at the last and he's in for a 69, nine under and tied for 16th as it stands. Not bad at all from the world number one, having snapped his ankle in half six weeks' ago, that's four under-par rounds.
Day -19 (12), Spieth -15 (12), Grace -15 (13), Rose -14 (13)
Here's Paul Casey of England, making par at the last for a two-over 74 and -4 overall. Day's second at 12 and it's a peach, he's got a four-footer for par. That's really not very good by Rose at 13, hands of a blacksmith from just off the green and he's got a longun for bogey. Spieth can't make the birdie putt at 12, stays four back. Day in for par, stays four clear... Rose did indeed make double, that's him dead... Grace leapfrogs him with a birdie...
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Day finds the bunker at the par-three 12th, looks like the wind took that. Spieth with a chance to close the gap... all over the flag, that was ballsy, he's got a chance of a birdie while his playing partner is trapped. This could be Rose's race run - horror lie in a bunker up at 13 and he can only just nudge over the rim.
Mickelson -8 (69)
I think we have officially entered Chokesville territory, if Day gives up a four-shot lead with seven to play, he will forever be remembered as another Aussie who threw a major away. A 69 for Mickelson today, and another top-20 finish in a major, as things stand.
Day -19 (11), Spieth -15 (11)
Spieth for birdie at 11...shovels it out right, that wasn't great. Day with a five-footer for birdie and in it goes, he leads Rose by three...
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Day's eagle attempt at 11 stays left of the cup but he should pop in for birdie and a three-stroke lead over Rose in second. Here's Rose at the par-four 13th, he's tugged it slightly, but it's not too dramatic, despite his reaction...
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Rose -16 (12)
Iain Carter
BBC golf correspondent on Radio 5 live sports extra
"Rose is playing quite beautifully. He's picked up four shots through his 11 holes today, no bogeys. He does have a good record of coming back from behind to win tournaments, he's done it four times on the PGA Tour."
Rose -16 (12), Grace -14 (12)
Rose has got a look at the par-three 12th, Grace is a bit juicy and hops through the green. This isn't pretty for Spieth, his ball is buried quite deep in some wispy stuff, but he's clipped one to within about 10 feet of the cup. Day, however, is putting for eagle... Grace makes par at 12, stays -14, Rose's birdie attempt wanders right of the hole...
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Spieth from the light rough at 11 and his ball has ricocheted off the ridge of the bunker protecting the front of the green and into some cabbage. A few more yards carry and he would have been putting for eagle. Day safely on in two, this is looking like a make and break hole...
Finau -10 (12)
A triple at nine took the sails out of Tony Finau's challenge but he's doing his best to dig his way back, he's just made eagle at 11 to get to 10 under again. George Coetzee of South Africa has birdied the 15th to get to 11 under, currently in a tie for sixth.
Rose -16 (11)
Day on tee at 11 and he creams one, that's strong and long. Birdie for Rose at 11, he's two back...
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Spieth has made two birdies at 11 in the last two days but he's found rough with his tee shot today. Rose at 15, third shot, and it's a beauty. He's got a very makeable putt for birdie to get to within two of Day. Grace fires his bump and run through the green...
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Spieth -15 (10)
Jay Townsend
Former American professional golfer on BBC Radio 5 live
"You never make up for a bogey it's on the card but you do make a birdie, that's a separate incident. The birdie gets you just that, you never get the bogey back."
Day -18 (10), Spieth -15 (10)
Spieth takes a while to settle over his putt before bending it in, he gets to 15 under and is three behind Day, level with Rose.
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Rose with a horror lie in a bunker at 11 and all he can do is nudge it back onto the fairway. McIlroy over at 16 and he's into the guts of the green in two. Day has got 10 feet for birdie at 10 and leaves it short. Spieth has a foot in the door, can he blast it open with a birdie?
Birdie
D Johnson -10 (11)
What goes through the mind of this man?
Dustin Johnson made quadruple bogey on the first hole and two more bogeys before the fifth hole. Did he crumble? Nope.
Five birdies and an eagle later he's on 10 under. Just imagine if he'd started solidly, he'd be right in this.
Major Sundays are never dull with this guy.
Johnson -11 (12)
A two for Dustin on 12, he's back to -11 - were it not for that quadruple at the first, he'd be right in the mix. As it is, his reputation as a swallower continues to grow, however fairly or unfairly.
Steele -10 (67)
Increasingly it's looking like only three men in the field are close enough to take down Day - Rose of England, Grace of South Africa and Spieth of the United States. Steele in with a 67 for a share of the clubhouse lead on 10 under.
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Thanks Luke, this is Ben Dirs again, until the close I believe. I appear to have put the kybosh on Kaymer with a bet before start of play, he's the only man in the top 15 over par. Sorry, Germany. Spieth on tee at 10, going with the big stick, and he melts one down there. Day, alas for Spieth, had already done so...
Double bogey
Rose -15 (10), Day -18 (9), Spieth -14 (9), Grace -14 (10)
Suddenly people are faltering, Jordan Spieth makes bogey on nine, his par putt slides away. Branden Grace is collapsing on 10, fluffing a chip from the rough to leave his fourth shot on this par four from the ugly stuff. He has a bogey putt but leaves it short and it's double.
Farewell Branden perhaps. If Jason Day can make par now he gains big time... he does. Well judged.
So over to you Justin Rose, this is a putt for birdie, second on the leaderboard to be three off the lead... straight in.
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Spieth -15 (8), Day -18 (8)
Jason Day becomes a club hacker very briefly, hacking into the turf several inches behind the ball. He caught that one fat to say the least and from a perfect position on the ninth fairway he now has a tough pitch to get up and down for par on nine.
To quote former England manager Graham Taylor, "this is a test". Beautifully judges to leave six feet. Jordan Spieth leaves a similar putt. Neither man will fancy these.
Eagle
Kuchar -13 (11)
Matt Kuchar gets the "Kooochh" call from spectators. Why? He sinks a short putt on 11 for eagle. Incredibly he's now on 13 under and in fifth place.
Play-off?
Listen to BBC Radio 5 live
Iain Carter
BBC golf correspondent on Radio 5 live sports extra
"If it does go to a play off it would be a three-hole play-off using holes 10, 17 and 18."
You can listen to Iain Carter, Jay Townsend and Eilidh Barbour on BBC Radio 5 live right now by clicking the live coverage tab at the top of this page.
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Spieth -15 (8), Day -18 (8), Grace -16 (9), Rose -14 (9)
Jordan, oh Jordan, stop pointing right off the tee box. His ball finds the thick rough and on this ninth hole, that's problems as the green is hidden away. Jason Day likes what he lampoons up the fairway - that's prime location. You have to find the fairway on these harder holes so you can generate spin to hold the ball on these greens.
On the green, Branden Grace and Justin Rose are in for pars. That's a great up and down for Rose.
Bogey
Day -18 (8), Spieth -15 (8)
Jordan Spieth has bang on 30 feet left on eight and it will break late to the right, it does, the weight is perfect and... and... won't drop. It trickled across the front of the cup and he dances on the spot and begs it to drop.
Jason Day cannot convert his par putt, that wayward drive claims a stroke.
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Rose -15 (8), Grace -16 (8)
Justin Rose, head bowed, talks to himself and these are words of anger. His ball on nine rips off the club but he starts waving his hands in protest immediately. Bounce, bobble, bunker. And he's short sided so getting out of that trap and near the pin will take a minor miracle. Bogey is very much in play.
Branden Grace is on the green and has an outside birdie chance. He has to post a number as Jason Day isn't going to come backwards through this field.
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Day -19 (7)
Don't speak too soon. He has to play out sideways from a bunker on the eighth and has 156 yards left into this flag for his third - it's a par four. It looks like a full swing and it makes the putting surface but leaves 20 feet. Could be bogey.
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Day -19 (7), Spieth -15 (7), Grace -16 (8), Rose -15 (8)
Jason Day finds bunker from the tee on the eighth which at over 500 yards will now ask him a question or two. Jordan Spieth is position 'A' but he needs to find something big now - three back. Up ahead on the green, Branden Grace and Justin Rose must have heard the noise generated by Day's putt on seven - they make pars. That putt from Day was something else. He can't lose it from here can he?
Birdie
Day -19 (7), Spieth -15 (7)
This is the moment, this is the moment we will look back on surely. Jason Day has over 40 feet to the pin on this seventh green. He has to be kidding us. What a putt. What a body blow, incredible. The Australian bounces off to the next tee and doesn't even watch Jordan Spieth make par. The adrenaline running through his body could fuel your car for the next week.
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American golf journalist Alex Miceli on BBC Radio 5 live: "I anticipated that it would be hard to score because of the hole positions but the one thing you can learn from this tournament is that it really doesn't matter if the scoring is low, as long as the golf is entertaining."
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Rose -14 (7), McIlroy -9 (13)
Justin Rose looks disgusted on the eighth hole as he leaves a long way for birdie.
"You can't expect to land it any softer than that, it's a wedge, that's my fault," says the man on his bag.
Rory McIlroy must get up and down from the bunker on 13 if he is to stay at nine under. McIlroy is three under today and looking solid but his chip here leaves 20 feet for par. Could be one back for the course here. He's currently tied 15th.
Grace in touch with history...
Grace -16 (7)
If Branden Grace could keep this up, he could become only the second South African to win the USPGA. Gary Player won it twice, in 1962 and 1972. He would also become the seventh South African to win a major. But let's not get ahead of ourselves, he's currently two behind Day...
Where will the mistakes come?
Birdie
Lahiri -13 (9), Grace -16 (7), Spieth -15 (6), Day -18 (6)
"Get in the hole", goes the cry from the spectators as Jordan Spieth whips one out of the rough on six. It nears the hole, this would be eagle... the roars grow and grow and then comes "ooohhh". Just two inches the wrong side of the cup and a birdie putt will follow.
Jason day must make birdie from where he is on the green, it's four feet. AND WE HAVE A FIST PUMP - it's Branden Grace on seven. He drains the life out of a 15 footer for birdie - three in a row. Want another birdie? Fair enough - Anirban Lahiri on nine with a lengthy putt.
Back to Spieth... nails it. Dear me this is like a birdie disco, the lights are blinding me... Day... birdie. He responds to everyone trying to haul him in.
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Day -17 (5), Spieth -14 (5)
Jason Day gets a juicy kick out from the rough on six. He will surely make birdie here as this hole is as easy as they get at this level. His tee shot is left of the fairway but kicks back onto the lovely short grass. Jordan Spieth is shouting "left, left" at his ball as he tries to drive this green. Such a big ping off his club face and he goes through the green but has nice position.
I can tell you Justin Rose and Branden Grace have hit solid shots into the seventh green off the tee - birdie hopes grow.
Birdie
Rose -14 (6), Grace -15 (6)
Phil Casey of the Press Association gives his view as both Branden Grace and Justin Rose make birdie on this very welcoming hole. They both hit it further than the average 285 yards Y.E Yang has managed of the tee in this tournament.
Birdie
Day -17 (5), Spieth -14 (5)
Spieth... right to left with mild break... super, super putt for birdie. That could be key, it ramps up the pressure on Jason Day who places his ball on this green.
Get that out of your mind Jason, play your own game... it's nine feet in all, deep breath... hugs the edge of the cup and gravity takes it. Birdies all over.
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Spieth -13 (4), Day -16 (4)
Ugly, ugly ball for Jordan Spieth. It sits in rough at a crucial stage on this par five. His third shot will have to be inventive and he pumps it along to run to the flag but it's short.
In this game of chess Jason Day can get in closer than his rival here. Day is middle of the fairway with a wedge in his hand and he leaves six feet for birdie. The lead could grow here. Day is inviting the punches and countering.
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Rose -13 (5)
Jay Townsend
Former American professional golfer on BBC Radio 5 live
"Justin Rose is doing the exact right thing in just trying to chip away at this lead."
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Finau -12 (6), Grace -14 (5), Rose -13 (5)
Tony Finau continues to refuse to go away. This big fella - 6ft 4in - shows gentle touch as he chips on the par-four fourth to leave a tap-in birdie.
Justin Rose and Branden Grace follow him up that hole and the green is reachable off the tee here. Neither make it but their balls are well positioned.
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Moore -3 (18), Chappell -2 (18)
There are two players in the clubhouse sharing the best score of the day so far. American pair Ryan Moore (pictured) and Kevin Chappell shot five under - 67.
Birdie
Grace -14 (5), Rose -13 (5)
Here's a man looking like he has the putter on flames... Branden Grace. What a stroke on five, it's long, breaking and in from 33 feet.
Is Justin Rose's putter toasty? You bet. No slippery margarine in sight here, straight in.
"Go hard please," says Jason Day as he tees off on the fifth - a par five - bunker time. Lots of room to haul that back on this long hole.
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Bogey
Spieth -13 (4), Day -16 (4), Rose -12 (4), Kaymer -10 (5)
Jason Day will feel good as he sees Jordan Spieth make just bogey on four. A three-shot gap with 14 holes to play in a major - he'd have taken that on Thursday.
Martin Kaymer shows some steel to par five after finding trouble and he stays in this... just. Justin Rose is coming up the par-five's fairway behind him and walking confidently as he sets up a great birdie chance. These are the ones that have to go in...
Stricker's last?
Stricker -4 (18)
Golf Channel writer Randall Mell brings us Steve Stricker after the 48-year-old finished on four under...
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Spieth -14 (3), Day -16 (3)
Do my eyes deceive me? Jordan Spieth under hits his par save on four by some distance by his standards and he will make bogey at best. Jason Day, to land a huge blow for birdie from range... no. Never on the right line. It was a timid effort to say the least but par scratches another hole off.
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Spieth -14 (3), Day -16 (3), Kaymer -10 (4)
Jordan Spieth will need to get up and down to save par on the fourth. It's a touch over 100 yards for him but with his wedge game, he can place a ball on a bit of dust when needed... not this time though as he goes over the flag to leave 25 feet for par. Far from ideal with Jason Day on the dance floor with a lengthy birdie putt to come.
Martin Kaymer, has he surrendered after his double bogey? Looks like it, over the green on five with his third. You have to bank the par fives today and he may only end up with par at best.
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Cheers Ben. Thoughts on the early jabs folks? Keep in touch with us on #bbcgolf.
Is this a straight contest between the top two or can someone win this from outside of the lead group?
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Post update
Rose putting for birdie from the fringe at four... come up a couple of revolutions short, he stays -12. Bjorn with a rare two at 17, but he's a mile back on two under. I'm going for a break, here's Luke Reddy for a bit...
Kuchar -10 (5)
Kuchar birdies five, gets to 10 under. Spieth tugs his tee shot into a bunker at four, that's Kaymer country, and he walked away with a double. Day made bogey at four yesterday but he's melted his drive down there today, he could be increasing that lead again...
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Spieth -14 (3)
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Spieth -14 (3)
Jay Townsend
Former American professional golfer on BBC Radio 5 live
"That was a great birdie two at that difficult par three. Jason Day holed a really nice par putt too, probably more difficult than Spieth's. It looks like both guys are under control of their emotions so far. As we creep nearer the 18th hole, that's where the nerves ratchet up a little more."
Day -16 (3), Spieth -14 (3), Lahiri -11 (5)
Lahiri drains a birdie putt from range on five, moves to 11 under. it's Day to go first, this is a ticklish one... makes it drop, it wasn't as far as eight feet, but he still needed to do a job on it. Spieth for his 86th birdie this year in majors, needs this... and gets it, moves to -14 and back to within two of Day.
Kaymer -10 (4)
Matt Kuchar (after four) and Brooks Koepka (after six) have moved to nine under, but that's now seven off the lead. Finau with a fine saver at four, the American stays 10 under. Day with that monster putt at three and he's raced it eight feet by. Spieth can make it a two-shot swing here... Kaymer doubles the fourth, drops to -10...
Ouch!
Johnson -4 (4)
Positivity is a must for any golfer but Dustin Johnson's tweet on Saturday night has proven quite inaccurate. The American is five over par for his round after four holes.
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Kaymer can only nudge his ball forward at the fourth, it's damage limitation from now on. Day at the par-three third... draws it a little bit too far, onto the fringe. Spieth stiffs his to within four feet of the cup. Whatever you can do... Kaymer has got about seven feet left for bogey at four, could be two shots gone.
Day -16 (2)
It would be harsh to say Jason Day's 'nearly man' tag is due to his nerves getting the better of him - the term 'bottler' is certainly unfair.
In placing second at the 2013 US Open he came from eighth place after round three but fell two shots off winner Justin Rose.
At the 2011 US Open he again finished second but stood no chance as Rory McIlroy led by a mile going into the final day.
And at the 2011 Masters, Day posted 12 under with Adam Scott but Charl Schwartzel birdied the last four holes to win by two.
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Day -16 (2)
Iain Carter
BBC golf correspondent on Radio 5 live
"That's a huge blow for Day to strike."
Day -16 (2)
Day makes birdie at two, opens up a three-shot lead over Spieth and Grace...
Grace -13 (3)
Kaymer gambling at four, thrashing out of the rough with three wood and finding sand. Spieth has a 10-foot par for birdie at two... borrows an inch too much, stays -13. Day with a chance to go three ahead, as Grace bombs in a longun at three to join Spieth on -13. Rose makes par, stays -12.
Stenson -7 (11), Lingmerth -9 (13)
Sweden's Henrik Stenson eagles 11, goes seven under. Fellow Swede Lingmerth has got his mojo working again, another birdie at 13 and he's five under today and nine under overall. Day with a fine bunker escape at the second, birdie chance...
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Spieth going with hybrid at two - out goes the hand but no need, he's popped back onto the fairway. Day going with three wood, throws the kitchen sink at it, and finds a green-side bunker. Only three men have hit that green in two today. Rose into the guts of the green at the par-three third...
Kaymer -12 (3)
No-one has made a significant move at the top of the leaderboard so far, the only man in the top eight who is under par is India's Anirban Lahiri, after three. Rose buzzes the hole with his birdie attempt at the second, stays 12 under. Kaymer pops in for birdie at the third, he moves to 12 under and three off the lead...
What a shot!
Kaymer on tee at the par-three third... what a shot that is, he's got a five-footer for birdie. England's Paul Casey is level through seven and six under overall...
Day -15 (1), Spieth -13 (1), Kaymer -11 (2)
Victor Dubuisson is five under for the day through 12 and eight under overall. Day makes par at the first, stays two clear on -15, as Spieth also makes par. Kaymer with a beautifully paced birdie attempt at two, taps in for par to stay -11.
Rose & Grace -12 (1)
Day with his second into the first, safely on. Spieth leaves himself with a better chance of a birdie, but Day also has a chance. Rose and Grace kick off with pars, stay 12 under...
'Going to need a shark attack'
Horschel -6 (3)
Breaking news... Billy Horschel - started eight under - shared the design on his trousers with the world of Twitter but after a double bogey on the second, his mood may now not be as vibrant.
Horschel tweeted: "Going to need a shark like attack to win today! What do you think about the pants Greg Norman?"
Norman, nicknamed 'The Great White Shark' replied: "Love your style and w/pants like that Attack every hole and go low. Good luck. Play hard."
Lingmerth -8 (11), McIlroy -8 (7)
Lingmerth has got another one of those spurts going, three birdies between eight and 11 and he's back to -8. Kaymer with his third at two and he's off the front of the green, he'll need all his touch to make par from there. McIlroy makes it birdie-birdie at the seventh, gets to eight under...
Spieth and Day away
Day, decked out in black shirt and grey slacks, narrows his eyes and composes himself, stalks his ball, before bending his drive over the bunker and onto the middle of the fairway. Spieth, in blue and grey, follows him down there...
McIlroy -7 (6)
Here they come, the main event of Day and Spieth. These two also played together on the final day of this year's Open - both men needed a birdie at the last to make the play-off, and neither man could manage it. Rose from the middle of the first... cosies his ball up behind playing partner Grace, both men with birdie chances. McIlroy makes birdie at six, gets to seven under.
Kaymer -11 (1)
Kaymer for birdie at the first, from eight feet... just grazes the hole left, he stays 11 under and four back. Louis Oosthuizen in with a 69 for four under.
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Whistling Straits is where it all began...
Day -15 (19:45 BST)
This will be one of the lasting images of the 2015 US PGA Championship...
And make no mistake, Jason Day feels right at home here. Much has been made about his nine top-10 finishes in majors but the first of those arrived at Whistling Straits in this tournament five years ago.
How has he reached this point this week? Good length off the tee - an average of 306 yards. Accuracy off the tee - finding the fairway pretty much three times out of four. And, finally, hitting the green with 78% of his attempts.
It's been classy and this man who knows how to go close, may finally get it done.
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Here's Branden Grace with his drive at the first, safely away. Justin Rose, the lone hope of the United Kingdom, pings his drive down there and gobbles up Grace. Both men in position A1.
He hit it how far?
Watson -7 (13)
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McIlroy can't get anything going today, he's started with five straight pars and he really needed to come exploding out of the blocks to have any hope at all. Kaymer with a fine bunker escape at the first, as I hear that Dustin kicked off with an eight, which saw him drop into a tie for 29th.
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Bubba bends in his birdie putt after that monster drive at 13 and he's now seven under. Kaymer gets his drive away at the first, as Johnson finally gets his ball on the green up ahead with his fifth attempt. Shades of Tommy Nakajima....
Now on the tee
Kaymer -11 (19:27 BST)
Martin Kaymer won the US PGA at this course five years ago on a day when, like today, he began his round four shots off the pace.
Kaymer loves it here and has said Whistling Straits is the best course he has played in America, so there are plenty of reasons why he can come up trumps.
That's ugly!
India's Anirban Lahiri has birdied the first and is 10 under, five off the lead. Dustin Johnson making a real mess of the first, he's just left two bunker shots in the trap... make that three... I'll keep you posted, suffice to say he won't be breaking his major duck this week.
Bubba Booey
Bubba's having a go today, and it's having mixed results - bogey, bogey to start, birdie at five, eagle at the par-four sixth, three birdies from 10 to 12th. As I write, he's just driven his ball through the back of the 13th - that's 430 yards. Difficult to get your head around to be honest.
What a shot!
Another birdie for Justin Thomas at the fifth, he moves to nine under par. And here's Mickelson, splashing in for eagle at six! Lefty had missed a few chances before that, but look at that face, the befuddled grin of a man who doesn't quite understand how he manages to do what he does. He's seven under.
'No margin for error'
Rose -12 (19:36 BST)
Justin Rose talks to Sky Sports: "Yesterday was all about staying in position. I've done that. I'm a few back but there's a chance. The breezy day should make it interesting. If one of the chasing pack post a score it will make it tough for the leaders.
"There's no margin for error with the wind up. Hopefully my ball striking will carry me through."
What score could get the job done? "In the 60s, maybe 68 on the higher end of things. We'll see what we can do."
Lead not always prime spot
Day -15
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Read and listen...
BBC Radio 5 live from 20:00 BST
All you need to digest on this final round of the US PGA Championship will be in this live text and on BBC Radio 5 live.
Golf correspondent Iain Carter is joined by former European Tour player Jay Townsend and Eilidh Barbour from 20:00 BST. You can listen through your radio or by clicking the live coverage tab at the top of this page.
'I'm really excited'
Day -15, Spieth -13 (19:45 BST)
Jordan Spieth is on the putting green, he's like a well-oiled factory machine. Putt... in... putt... in. He's working on the line of his stroke and the man on his bag Michael Greller is charged with collecting the balls from the cup.
Jason Day is on the range hitting irons with a big pile of balls. These are crucial times for these players, get that swing loose, kick any clutter out of the mind, deep breaths. They will tee it up in under 45 minutes.
Day tells Sky Sports: "Right now I've just got to focus on the process and get the preparation correct.
"I'm really excited about today, it's going to be a lot of fun. The challenge of playing against Jordan and the guys behind. It'll be tough, the wind is up but to make it as stress-free as possible will be nice."
Jordan's midnight run?
A quick reminder that should Jordan Spieth win tonight he will become world number one.
And, if he or any of his compatriots lift the Wannamaker Trophy, the United States will be home to all four major champions in a season for the first time since 1982.
To take your mind back to 1982 briefly, in August of that year, Dexys Midnight Runners topped the UK charts with 'Come on Eileen'. Tune.
Pumped and ready
Day -15 (19:45 BST)
Steele -8 (6)
Sergio Garcia's hunt for a major continues, the Spaniard, who announced himself to the world by duelling with Tiger Woods at the 1999 US PGA, is in with a 70 for level par overall. Brendan Steele of the United States birdies four, five and six and is eight under, joint lowest on course.
Thomas -8 (3), Schwartzel -7 (3)
Justin Thomas, he of the radioactive trousers, is two under after his first three holes and the lowest currently on the course, eight under. Former Masters champion Charl Schwartzel birdies three to get to seven under, McIlroy pours in a good saver to remain six under.
What does the winner get?
The winner today will pick up a whopping $1.8m. That's around £1.15m. This season, Jordan Spieth has pocketed close to £6m in prize money alone, and you can bet those blue chip companies are fighting to throw more money at him.
Oosthuizen -5 (14)
England's Paul Casey at three and he stiffs his tee shot to within eight feet. McIlroy for birdie at two but it dies at the last moment, he stays -6. Louis Oosthuizen, who lost out in a play-off at this year's Open, is four under after 14 and five under for the week. The South African was fancied this week but has left his charge too late.
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An ugly end to the week for England's James Morrison, who carded a 78 today. The Surrey golfer is propping up the leaderboard on nine over, although just making the cut on debut is something to be proud of. Many great players didn't. It hasn't been a great year for French Ryder Cup star Victor Dubuisson but he's having a good US PGA - he's three under after seven and six under for the week.
Post update
McIlroy parred the first and here he is going for the green in two at the second... finds a horrible little bushel. There's a 15mph wind out there and not many going low, but good scoring is possible - Steve Stricker is five under after 12 and seven under overall, Ryan Moore and Kevin Chapell are in the clubhouse after 67s.
The state of play
Australia's Jason Day, who has a host of near misses in majors, leads on -15, two ahead of American Jordan Spieth, who is bidding to become only the third man to win three majors in the same year, after Ben Hogan and Tiger Woods. South Africa's Branden Grace and England's former US Open champion Justin Rose are one further back, one ahead of Germany's Martin Kaymer, winner of the tournament the last time it was played on this course in 2010.
Day and Spieth go off last at 19:45 BST, Grace and Rose at 19:36, Kaymer and American prospect Tony Finau at 19:27, American Dustin Johnson and Australia's Matt Jones at 19:18. World number one Rory McIlroy, nine shots back overnight, teed off at 18:15. Who's your money on?
Post update
Evening. Welcome to the final day of the final major championship of 2015, the US PGA at Whistling Straits, Wisconsin. After a chaotic moving day on Saturday, when a gaggle of players with sharpened elbows jostled for position ahead of the final straight, Sunday promises high drama...