Iain Carter
BBC golf correspondent at Valhalla

That one landed like a rotten peach on the green. Didn't move. Uphill putt and a great chance.

McIlroy stiffs his second to within eight feet, that was magnificent...

A great shot from behind McIlroy's head shows Mickelson making magic up ahead and the crowd rising to his genius - follow that, wee man...

Image source, Reuters

Stenson, I'm told, hasn't missed from inside six feet all week, which is pretty remarkable. Mickelson has got a monster for par at 12... NAILED IT! The fist pump of Thor follows that saver from 30 feet, that could be a pivotal moment in this final round... Fowler dabs in his par putt, both remain -15...

Some say the US PGA Championship is the least coveted of the four golf majors. To make up for that however, it has the biggest prize fund of $10m. The winner takes home a cool $1.8m.

McIlroy finds the fairway with his tee shot at 12, Stenson makes birdie at 13 to make it a three-way tie of the lead. It will soon be a two-way tie before Phil is making a bit of a ricket of the 12th...

Mickelson yanks his second left of the green at 12, a peach of a pitch from Stenson up ahead on 13. Justin Rose in with a smart 67 for -8, Scotland's Marc Warren in with a 67 for -9. Fowler leaves his second just short at 12, but he could get close with his chip...

Tremendous tee shot at the par-three 11th from McIlroy, the world number one looks reenergised. He's got an uphill putt from about eight feet for birdie and a tie of the lead. Stenson pings an iron down the 13th, Fowler lets rip with a three wood at 12. "Mashed potato," roars a simple soul from behind the ropes as Mickelson lets fly. Presumably "mashed potato" is local dialect for "he's missed the fairway".

Tremendous from Fowler, that was gravel in the guts stuff from eight feet out for par. He bumps fists with Mickelson before setting off for the 12th tee, it's the golfing equivalent of Butch Cassidy and the Sundance Kid, wouldn't want to come across these two at the Ryder Cup at Gleneagles.

Fowler putting from afar at 11... comes up well short, needs a knee-knocking saver. Just like this one from Stenson at 12, that's a beauty to stay -14. MICKELSON BIRDIE! He joins playing partner Fowler in the lead on -15, but for how long?

Wiesberger for birdie at 10... he'll pop in for par, stays -11. McIlroy now, stalking the hole, getting ready to launch a grenade into the top of the leaderboard... BOOM! Nails his eagle putt, gets back to -14 and one off the lead. Plenty of golf left yet...

Stenson starting to blink as things get tricky, he's found sand with his second at 12. Mickelson on tee at the par-three 11th, that's magic, birdie chance. Not so good from Fowler, but he's got a whiff in his nostrils, even from that range.

McIlroy needs something from this par-five 10th... and he might get something, that's one of the shots of the day, a crackerjack three wood to within about eight feet of the hole. That's for eagle...

Image source, Getty Images

Stenson and Ilonen get their tee shots safely away at 12. Fowler for birdie at 10... long right-to-lefter... in it drops, he takes the outright lead on 15 under par. But for how long? Mickelson takes aim, fires, squeezes it by, stays -14.

Dave Baker:, external The Americans should definitely pair Fowler and Mickelson in the Ryder cup based on this. Both feeding off each other.

Some body:, external Several top players pulling out their top game! Won't be Rory's day today by the looks of things.

Stenson in conference with his caddie, Gareth Lord, over his birdie putt on 11 but when it comes to hitting it, the Swede doesn't commit. Stays -14. Fowler with a wedge into the 10th, but that's pretty ordinary by his standards. Mickelson has the ball above his feet in the second cut but what a shot that is, both have chances for a birdie and the outright lead...

Wiesberger hasn't given up hope just yet, that's a good saver at nine for a front nine of 36 and -11 overall. McIlroy also makes par, stays two off the lead. Mickelson thrashes his second into more rough at 10, leaves himself a tricky third. Fowler laying up, but he's on the shorter stuff...

Spaniard Gonzalo Fernandez-Castano, external on Twitter after a final-round 71 to finish even par: "Watching the golf in a bar in Louisville airport. Everyone's cheering for Mickelson, a few for Rickie. I'm with Stenson."

Image source, Getty Images

Only Jack Nicklaus (1971 and 1973) and Tiger Woods (2000, 2005) have finished in the top five of all four majors in a season in the modern era. Rickie Fowler, currently tied for the lead, will join them if he places in the top five today.

McIlroy taking nine iron from 150 yards at nine... misses the green. Mickelson going with his biggest stick off the tee at 10... the crowd whoop and holler as if Mickelson has just turned his golf ball into wine. In truth, it hits a large man sitting to the left of the fairway. Fowler, however, is high and handsome...