LOUISVILLE -- Rory McIlroy won his second consecutive major by winning the PGA Championship Sunday.
He finished at -16 to win by a stroke after parring No. 18.
McIlroy, who stumbled early in his round, was brilliant coming down the stretch.
That included a birdie on No. 17 to give him a 2-shot lead on Rickie Fowler, Phil Mickelson and Henrik Stenson heading to No. 18.
- LEADERBOARD: PGAChampionship
However, the entire field battled the oncoming darkness, McIlroy struggled with a bunker shot and the possibility of eagle by either Mickelson or Fowler on No. 18 for one last gasp.
Mickelson's chip came so close but he settled for birdie and a 66 on the day. He finished -15.
McIlroy, who won the British Open last month, has now won four majors and two PGA Championship titles.
Padraig Harrington was the last golfer to win back-to-back majors when he won the 2006 British Open and PGA Championship.
The last player to win three consecutive events on the PGA Tour was Tiger Woods who won five straight events in 2007.
Only Tom Morris Jr., Woods, Jack Nicklaus, Bobby Jones and Willie Anderson had won four majors by the age of 25.
The leaders were bunched tightly after Saturday's round and they remain glued for much of the day on Sunday at Valhalla Golf Club.
Early on Sunday there was a five-way tie for the lead that included Phil Mickelson, Rickie Fowler and Rory McIlroy with Ernie Els a shot back after going six-under on the first 11 holes.
McIlroy struggled a bit on the front while Mickelson, Fowler and Henrik Stenson carried the lead as Fowler and Mickelson made the turn.
But after Fowler birdied the par 5, No. 10 and Mickelson birdied No. 11, McIlroy hit a monster approach on the 10th and eagled it to put himself back in the hunt. A few holes later he birdied No. 13 to tie for the lead again.
Rain in the Louisville area halted play early in the day and players had to sit out a two-hour delay.
After Saturday's round, Rory McIlroy was the leader at -13. Bernd Wiesberger was at -12, Rickie Fowler was at -11 with Phil MIckelson and Jason Day at -10.
Although he had just a one-shot lead to start the final round, McIlroy had to like his chances at the start of Sunday. He had won all three of his majors with the lead.
'It's not the biggest lead I've ever had,' said McIlroy after Saturday's round with eight players within four shots. 'But I'm still in control of this golf tournament.'
Fowler, a runner-up in the last two majors and the first player since Tiger Woods to finish among the top five in all three of them, was one of those eight players and just two shots back.
The PGA Championship does not bill itself as the toughest test in golf. It assembles the best field of the majors and lets them slug it out over four days. Add a super soft course from morning showers, and cheers rained down from every corner.
The average score on Saturday was 69.6,
The 25-year-old McIlroy was coming off a wire-to-wire win at the British Open and rallied to win a World Golf Championship in his next start.