Stenson on 10, that's a nervy birdie putt. Are things getting to the Swede as they approach the business end? Mickelson makes that birdie, we now have two men in black and a man in tangerine atop the leaderboard. Birdie for Ilonen of Finland at 10, he's -12.

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Scotland's Colin Montgomerie, who had to finish the 18th hole after the rain delay, said the PGA of America should have taken the same action as the R&A at last month's Open championship by using a two-tee start, with players in three-balls instead of pairs, in the third round for the first time in its 154-year history.

"They're not going to finish tonight and nobody wants to be here on Monday, nobody," said Montgomerie. "Instead of having two guys every 10 minutes, you'd have six people finishing every 10 minutes."

McIlroy bombs one down the par-four ninth, here's a shot of Westwood at 13th, playing a doozy of an approach. Donaldson is doing his Ryder Cup hopes no harm at all - birdie at 10, another birdie chance at 11 after a sweet tee shot.

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Henrik Stenson (-14) shot 30 on the front nine to be co-leader. That is the Swede's best nine holes in a major.

Jimmy Walker is also in with a 65, he joins Els as clubhouse leader. Fowler with his second at nine, safely on, not much more than that. Pin on the top level, Mickelson taking aim... what a shot, he's got a 10-footer for birdie and a share of the lead.

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Mickelson pumps his tee shot down the ninth, that's fine. McIlroy leaves his birdie par just right at eight, stays two off the lead. Els for a two at the last, from long-range, doesn't hit it. But if he pops that in it's a round of 65 for the clubhouse lead on 11 under. Palmer makes a long one disappear on the 10th, that's an eagle for 11 under...

McIlroy into the guts of the green at eight, birdie chance from about 20 feet. Birdie for Dubuisson at the par-three 14th, the Frenchman with the beard of the Laughing Cavalier and the Mona Lisa smile is -10. Fowler pings one off the tee at nine, Stenson tugs his drive left at 10, he won't be getting down in two from there...

Fowler pops in for par at eight, stays in the lead on -14. Mickelson conjures some magic from the sand and taps in for a par to stay one back. There end the faint hopes of Ernie Els, bogey at 17 to drop back to -10.

Apologies if I neglect to mention your favourite player from here on in, but there's so many buns being thrown at the very top of the leaderboard that that's where my focus must be. McIlroy makes birdie at seven, gets back to 12 under and two off the lead...

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

"Stenson's a steamroller. When he gets going he can overpower golf courses."

Mickelson off the tee at the par-three eighth, and he finds the sand. Fowler, meanwhile, is dancing. Henrik makes birdie on nine, from about 18 feet, and the Swede joins Fowler atop the leaderboard. Sabres being rattled all over the course, this is compelling...

Nine-time major winner Gary Player, external on Twitter: Looking good today Henrik Stenson all in black. Let's go #BlackKnight

South African Player is nicknamed the Black Knight for always wearing black outfits on the course.

McIlroy comes up just short of the bunker with his approach at seven, but an up and down there will get him right back in the conversation, as people like to say nowadays. Day makes a longun disappear at eight to stop the bleeding, the Aussie back to -10...

Fowler makes no mistakes from five feet, and the man in orange takes the outright lead...

Mickelson from about 20 feet at seven... curls, left to right, misses by a whisker's whisker. But it's a birdie and he's in a three-way share of the lead on 13 under. But for how long? Here's Rickie...

Ernie on 17, needs something here... flyer out of the rough, over the back. Fowler from the sand at seven... almost sticks it in, he'll have a five-footer to grab the outright lead on -14...

McIlroy could do with some boom-bang-a-bang off the tee at seven, just to get some confidence back, and he finds one, straight down the middle. Rory will be able to hear the effusive support for Mickelson up ahead, and that might be getting to him.

Els was unable to maintain that hot streak down the back nine, four straight birdies between 12 and 15, he stays two off the lead. Birdie for Jim Furyk at 10, he's now 10 under. Fowler with his approach at seven, going with hybrid... slices it into the sand. Mickelson all over the flag with his second, makeable eagle putt to get to -14...

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McIlroy missed that par putt and he falls two behind the leaders, as does Wiesberger. Not looking good for McIlroy or his Austrian, they're the only two men over par in the top 30. Stenson nails his birdie at seven, he makes it a two-way tie at the top with Fowler...