A torrential rainstorm inundated the Valhalla Golf Club, the site of the PGA Championship, Sunday afternoon just as the top-ranked players were getting ready to begin the tournament's final round in Louisville, Kentucky.

Northern Irishman Rory McIlroy, winner of the British Open earlier this summer, stood at 13-under before tee-time but couldn't even begin his warmup session due to the rain. Some of his nearest rivals and favorites in the standings, including South Africa's Louis Oosthuizen, Sweden's Henrik Stenson and Briton Lee Westwood, had to take cover in the practice tent.

Over an inch of rain fell in less than an hour.

Meanwhile, the U.S. trio of Phil Mickelson, Steve Stricker and Jim Furyk, thanks to the strength of their short games and length of their drives, have remained at the top of the rankings and have kept McIlroy in sight all week, making it essentially anyone's tourney to win.

Once the storm has passed, hundreds of volunteers spread out to remove the puddles from the course and Valhalla's spectacular drainage system was removing the water from the greens.

Competition resumed after almost a three-hour delay but it is probable that the players at the top of the leaderboard, including American Rickie Fowler, Austria's Bernd Wiesberger and McIlroy will not be able to finish the round until Monday.

Spain's Sergio Garcia was eight strokes behind McIlroy before the tee-off on Sunday, but American 14-time major champion Tiger Woods, who has been struggling with a back injury, missed the cut for this year's tourney. EFE