US PGA Championship 2014: Rory McIlroy's final round – in pictures

Course workers had to push huge amounts of rain water off the course to make it playable after rain caused a suspension of play during the fourth round of the 96th US PGA Championship at Valhalla Golf Club in Louisville, Kentucky Photograph: Mike Groll/AP

Rickie Fowler, left, and Phil Mickelson were pursuing overnight leader Rory McIlroy. They began their rounds shortly before McIlroy Photograph: Jeff Gross/Getty Images

Rory McIlroy, who started the day at -13, drew huge crowds Photograph: Mike Ehrmann/PGA of America via Getty Images

McIlroy, pictured, struggled in the early stages of his final round and lost his overnight lead as the chasing pack of Fowler, Mickelson and Henrik Stenson fared rather better Photograph: Brian Snyder/Reuters

Austria's Bernd Wiesberger, who was in the final pairing with McIlroy, also wrestled with the conditions and saw his chances crumble. Here, the two men look on intently from the fifth tee Photograph: David Cannon/Getty Images

McIlroy powers out of a bunker on the sixth hole. By the turn he was still one over for the day and rapidly losing ground on the leaders Photograph: John Locher/AP

His every move was watched by United States armed forces personnel Photograph: David Cannon/Getty Images

It was this shot, McIlroy's second on the tenth, which totally transformed his round. His 281-yard approach shot with a 3-wood enabled him to reach the green in two strokes and set up a a ten-foot eagle putt, which he duly converted. Photograph: Andy Lyons/Getty Images

Thereafter, McIlroy's confidence soared. A birdie on 13 coupled with dropped shots by his rivals in subsequent holes made him the sole leader going into the closing holes Photograph: Andrew Redington/Getty Images

With light fading, McIlroy was allowed to hit up the 18th fairway ahead of schedule. He had a two-shot lead going into the par five 18th, but a wayward first shot landed perilously close to the water, pictured, and a dodgy second shot saw him land in a bunker Photograph: David Cannon/Getty Images

... meanwhile, his main rival, Mickelson, almost eagled the hole with a superb chip Photograph: Mike Ehrmann/PGA of America via Getty Images

But McIlroy recovered his composure and calmly two-putted the hole to seal victory by a single stroke Photograph: Larry W. Smith/EPA

It's his second US PGA Championship and means he's won back to back majors. He celebrated on the 18th green with his father, Gerry Photograph: Sam Greenwood/Getty Images

The Northern Irishman had to help catch the Wanamaker Trophy as it slipped out of the hands of the PGA president, Ted Bishop, during the presentation Photograph: Brian Spurlock/USA Today Sports

Finally, with the sunlight having disappeared, he was able to show off his silverware Photograph: John Locher/AP