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Put yourself in the shoes of Bernd Wiesberger. How do you think you'd sleep, picturing yourself in the final pairing of a major championship alongside world number one Rory McIlroy?

"I had a good night's sleep and quite a relaxing morning," said the 28-year-old, unfamiliar with the business end of major golf but by no means fazed.

"It's unique so I go out there with no particular expectations. I've got nothing to lose and I'll enjoy being in that position. Yesterday I was every pleased with the way I handled myself, playing with Phil Mickelson.

"I had a struggle leading up to the Open Championship, which was disappointing, and now I'm looking to turn things around."

After finishing second at his home tournament in early June, the Lyoness Open, the world number 70 has missed three cuts in five tournaments ahead of the US PGA championship.

McIlroy with the big stick and it looks like he's sliced that into the rough to the right. Wiesberger goes the same way but finds the shorter stuff. Mickelson kicks off with a long-range birdie at the first, that's massive, he moves to -11. Not so Fowler, he stays -11...

Rory McIlroy's form in 2014 has offered a consistency lacking 12 months ago, when a change of clubs made headlines and prompted a number of poor results. One year on, he averages two shots a round less, which equates to an improvement of eight strokes per tournament.

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Jimmy Walker, playing with Els, did birdie seven to get to nine under. Here's McIlroy striding to the first, about to get chocs away...

Stenson also birdies the first to move to 10 under, it's turning into a bunfight up there. Fowler looks for all the world like he's hooked his tee shot into the trees but the camera suddenly reveals he's cleared them and made the fairway on the other side. Mickelson, too, is safely away. Another birdie chance for Els at eight...

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Rickie Fowler, the nearly man of the majors in 2014, reckons playing with compatriot Phil Mickelson could give the Americans the edge as they stalk leader Rory McIlroy.

"Playing alongside Phil it'll be a good time, hopefully we can feed off each other and get something going. We'll see if we can give Rory a bit of a run," said the orange-clad 25-year-old, who always wears his Oklahoma State University colours for the final round of tournaments.

"It's nice playing with friends. Phil's definitely been a mentor. We'll have a good time and hopefully use it to build momentum."

Ilonen birdies the first to get to 10 under, Furyk is nine under after a birdie at four. Westwood's birdie putt at four breaks too much and he stays eight under. Oosthuizen and Day set up birdie chances at the first, we're all set for the Mickelson and Fowler show back on the tee...

Four birdies between seven and 11 for Schwartzel, he's tied for seventh on nine under.

As coverage of what looks to be a birdie-filled final round continues on BBC Radio 5 live Sports Extra, the team in Kentucky have posed you all the following question:

If Rory McIlroy adds this championship to the Open he won last month, would his be the biggest achievements in British sport this summer?

Send us your views to #bbcgolf or text 85058.

Valhalla has rich play-off form. The US PGA has gone to a nail-biting play-off on each of the last two occasions that the Kentucky course has hosted the tournament.

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In 1996, Mark Brooks defeated fellow American Kenny Perry with a birdie on the first extra hole.

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And in 2000, Tiger Woods defeated Bob May in the first three-hole aggregate score play-off in major history. The 24-year-old made a birdie on the 16th hole and finished with two pars, as May parred all three holes.

Ryan Palmer is, indeed, 10 under and three off the lead after that birdie at the first. Next off the first tee are the Nordic combination of Stenson and Ilonen...

Here's Levy at seven after two big old thumps but he leaves his chip short of the green. Former two-time champion Vijay Singh is in with a 69 for three under overall, Schwartzel bends in a birdie putt on 10 to move into that gaggle on eight under. What is the correct collective noun for golfers? One lady I once knew suggested 'a tedium of golfers'. We don't speak any longer...

Nice saver from Rose at eight, he stays five under. Palmer with a peach of a second at the first, he should pop that in to get to 10 under and three off the lead.

Jay Townsend
former European Tour golfer & BBC Radio 5 live pundit

"We don't play lift, clean and place for mud balls. We do it for relief from casual water. Mud balls are part of the game. Luck is part of the game, it always has been."

Because of that unwanted rain interruption, we are resigned to a late finish tonight and - even if there are no more stoppages - the tournament could still go into Monday. That's because a play-off will be needed if two or more players are tied after 72 holes.

If necessary, there would be a three-hole aggregate score shootout on the 13th, 17th and 18th holes. And the early chat from Valhalla is that the contenders would have to book their hotel room for another night and return to the course after a good sleep.

US vice-captain - or is he? - putting for birdie on one and he cosies one up there and taps in for par, stays eight under. Garcia with a 12-footer for birdie at five, moves to six under.

Rose with a peach of an approach at seven and he raps in his birdie putt to get to five under. It's as if that deluge never happened a couple of hours back, looks dry as a bone out there now. Ryan Palmer on the first tee and he ding-dongs his drive straight down the middle. Furyk drains a longun on two, moves to -8.

BBC Radio 5 live

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ESPN analyst and former caddie Michael Collins, external chatting with Iain Carter and Jay Townsend, weighing in on the Tiger Woods v Rory McIlroy debate.

"Let's remember Tiger was really engaging with the media early in his career, until he got burned. And Rory's people have already started saying 'he's not going into the media centre', 'he's only answering three questions' etc.

"Winning trumps all of it. If Tiger was that much of a jerk he wouldn't have billboards for Nike in Guatemala. The more Rory wins the more his face is going to be out there. When he gets to eight majors, let's see if we think the same way. But Rory's not polarising, nobody hates him."

Els for a fourth straight birdie from about 15 feet on six, he's now nine under and lowest out on course. And only four shots off the lead...

Birdies at seven and eight from former Masters champion Charl Schwartzel and he's now seven under. Wood stiffs his approach to within a couple of feet at 10, another birdie coming up.