Reebok Dmx 2000
It was the fourth time McIlroy had held the 54 hole lead in a major, the first leading to heartache in the 2011 Masters when he was four ahead entering the final round at Augusta only to collapse to a closing 80.
Stern test facing McIlroy Express Star
Stenson had offered a prayer of thanks to the golfing gods when his approach to the 13th just carried the water and Saucony Life On Mars
That soon became a five way tie when Rickie Fowler recovered from a bogey on the second with birdies at the third and fourth and Henrik Stenson picked up his third shot of the day on the fifth.
A superb chip from the edge of a bunker on the seventh set up McIlroy's first birdie of the day but Fowler had also picked up a shot there and then holed from 28 feet on the 10th to reclaim the outright lead on 15 under.
With the Valhalla course already saturated, a torrential downpour saw play suspended at 12:53pm local time, more than two hours before the final pair had been scheduled to tee off.
Fowler dropped out of the lead after a wayward tee shot led to a bogey on the 14th and when Mickelson bogeyed the 16th, McIlroy was back in the outright lead for the first time since the third hole.
Stenson drew level again with a two putt birdie on the seventh and when McIlroy failed to get up and down from a Reebok Basketball Shoes 90's
Last month he led from start to Reebok Dmx 2000 finish at Royal Liverpool, taking a six shot lead into the final round before going on to win by two from Sergio Garcia and Rickie Fowler.
Play was eventually able to resume almost two hours later with McIlroy and Saucony Kineta Boots
bunker on the sixth, the 25 year old found himself two shots off the lead.
set up a birdie from three feet, only to three putt the next to drop back out of the lead.
But the world number one made no mistake from eight feet on the 13th to get back into a share of the lead with five holes remaining.
Lifting the Wanamaker Trophy for the second time would also see the Northern Irishman become the third youngest player after Tiger Woods and Jack Nicklaus to win four majors, just one less than the total won by the late Seve Ballesteros and two behind Nick Faldo.
But Fowler, who finished joint fifth in the Masters and joint second in the US Open and Open this season, then moved into the outright lead by chipping in for his third birdie in succession on the fifth.
The Open champion started with two pars before three putting the third from long range to drop back into a tie for the lead with Wiesberger and Phil Mickelson, who had birdied the first and third.
Austria's Bernd Wiesberger starting at 4:19pm, meaning they faced a race against time to finish before darkness descended in Louisville.
McIlroy missed good birdie chances on the 11th and 12th, the latter after seeing Mickelson in the group ahead hole from 30 feet across the green for an unlikely par.
Two months later he bounced back in spectacular style to win the US Open by eight shots at Congressional before winning the 2012 US PGA by the same margin at Kiawah Island.
McIlroy was looking to claim the fourth major of his career and become the first player since Padraig Harrington in 2008 to win back to back majors.
Mickelson had missed from much closer than Fowler on the 10th but made amends on the 11th to join his playing partner in the lead, the pair exchanging fist bumps as they walked to the 12th tee.
McIlroy therefore found himself three off the pace but got back into contention in spectacular fashion, hitting his approach to the par five 10th to seven feet and rolling in the putt for an eagle.
Reebok Dmx 2000
Burberry Saffiano Leather Card Holder