An army of fans looking for Jones's ball, which is eventually located not far from the beach. You can't miss Billy Horschel, his trousers are radioactive. Another chance on 13, that would be four birdies in a row. Dustin Johnson muscling his way back into contention, golf's jilted bride is seven under after 11. Horschel missed that birdie putt...

Horschel has picked up shots at 10, 11 and 12 and is nine under, three off the lead. Rose's second at eight and it's into the guts of the green. Casey easily on in two at 15, birdie chance. Jones takes aim at eight and out goes the arm, he's missed the fairway off to the right. That's the beauty of this course, there are bear traps around every corner.

Jones for birdie at seven, from about 30 feet... he's almost stuck it in, misses by about two inches to the right. Koepka rolls in a birdie at 18 for a round of 67 and seven under and McIlroy follows him in for a 68 and six under.

Here's Ernie Els with a monster birdie putt at the last, that's a 69 for five under overall. Shot gone for Kuchar at 13, he drops back to -7. McIlroy at 18, from the middle of the fairway. All over the flag, could well make birdie from there. What a recovery from Day back at seven, that was a gem and he should save par.

Justin Rose bags another bird at seven, the Englishman is now nine under and four off the lead. Matt Jones on tee at seven, safely on. Day doesn't like his tee shot and no wonder, he's found some nonsense out left...

Image source, Getty Images

Kaymer is nine under after a birdie at 14, the German, winner at Whistling Straits in 2010, is looking good. Here's Day at six, from about 12 feet... leaves it a whisker right. Matt Jones buries his though, he's 13 under and now has a three-shot lead over the field...

Lingmerth making a right dog's dinner of the sixth, two shots gone after a flyer out of a bunker and suddenly he's back to six under. Day with 98 yards left at six, that's a corker, birdie chance from there. Kuchar rams one in at 12, gets to -8. McIlroy for birdie at 17... didn't hit it, although it was a lot longer than I thought, he stays -5.

Eilidh Barbour
BBC Radio 5 live sports extra commentator

"David Lingmerth with a double bogey putt and it could have been a lot worse for him."

Thanks Luke, this is Ben Dirs for a bit, fresh from England beating France in the rugger. McIlroy on tee at 17, makeable birdie putt from there. Jeev Milkha Singh is the highest finisher by an Indian in a major, or so I believe, he finished ninth in the US PGA in 2008. But Anirban Lahiri is currently nine under through six and looking handy. Tony Finau gets to -10 and within two of the lead courtesy of a birdie at seven.

A thought on Billy Horschel's trousers today. Yikes.

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Jason Day is just alternating throughout - birdie, bogey, birdie, bogey, birdie - through five holes.

He takes advantage of the par five fifth for the latest birdie. Remember, Day made bogey on the last hole of his second round this morning so in six holes he's picked up three bogeys.

Rory McIlroy has another shot back after a four on 16. His eagle putt wasn't far away either.

Grace nails his 10 footer on 13 but Martin Kaymer, closer and on the same line can't get his effort right.

Justin Rose takes his shoes off to stand in the water. He rolled those cream slacks up to his knees and takes a smooth swing to find the green. Can he convert... dry those feet Justin... great putt. Died of pace near the hole and had just enough life in it to go in.

David Lingmerth refuses to go away. He's a tough cookie the world number 45 and his putt is wonderfully judged, threatens to break but doesn't - back to eight under after five.

Image source, Getty Images

I bring you news of a Rory McIlroy bogey on 15. He actually struck a fan with his second shot and had a nice exchange with the poor fella who looked absolutely fine.

So, we await the go-to line... McIlroy must be tired after five weeks out. I've not heard it yet but give it another couple of holes.

Still, he got the blood pumping around Whistling Straits with his early magic today. Four shots made in five holes from the off remember.

Whoaa. My head is spinning. Everything drops and I mean everything. Branden Grace - birdie on 12 to reach nine under - that had to drop.

Martin Kaymer, no way is this one going in from the front of the 12th green - it's a full 30 footer - the roars go up as it creeps closer and yes, it's in. What a putt.

Paul Casey, from around 15 foot for eagle. You know the rest. Drops. Steady on gents.

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The body language of Rory McIlroy has changed somewhat from that early charge through five holes. Here he picks his club off the floor and he carries his shoulders like a stroppy teenager. He just looks fed up as that ball lands among spectators left of the green.

Jason Day goes bogey-birdie-bogey. Too much trouble to duck on the fourth hole and he can't drain a 15 foot par attempt.

The top guys aren't charging - Branden Grace is. After birdie on 11 his tee shot on 12 is just six feet from the cup. Our leader Matt Jones is steady away - par on four with two putts.

Did you know that in the moments after Jordan Spieth missed his put to reach the Open Championship play-off, his sponsor - Under Armour - took a hit of around £90m on their share price?

Don't feel too sorry for them though, it's a drop in the ocean for the clothing manufacturer. Intrigued? Read all about it here.

As Jordan Spieth - the putting machine - gets a birdie attempt wrong on the par-five fifth - it feels to me like someone needs to grasp initiative here. Plenty of missed chances out there but they won't win the bounty come Sunday night (or very early on Monday morning if you're UK based).