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Memorial Tournament final leaderboard
-8 S Scheffler (US); -7 C Morikawa (US); -4 A Hadwin (Can); -3 C Bezuidenhout (SA); -2 M Fitzpatrick (Eng), S Straka (Aut), L Aberg (Swe)
Selected others: +2 R McIlroy (NI); +3 T Fleetwood (Eng); +12 S Lowry (Ire)
Scottie Scheffler holed a five-foot putt on the last to hold off Collin Morikawa and win the PGA Tour's Memorial Tournament by one stroke to claim his fifth title of the year.
In doing so, the world number one became just the second player after Tiger Woods to win the Players Championship, Masters and Memorial in the same year.
The American led on 10 under overnight, four clear of Morikawa, Adam Hadwin and Sepp Straka but, rather than the expected procession, he was pushed all the way.
"I didn't do a whole lot well but I did enough to get it done," said Scheffler, who carded a two-over 74 to win his 11th PGA Tour title on eight under.
"I feel like I've had some close calls in this tournament. The golf course was playing so tough, firm and fast - 16, 17 and 18 were brutal.
"But it was a fun test of golf, I like it when it gets hard."
On a tough day for scoring at Jack Nicklaus' Muirfield Village, Ohio, Scheffler's advantage was down to two after nine holes.
But while Hadwin, who had started the strongest with three birdies in his opening seven holes, fell away with five bogeys in his final 11 holes to finish third on four under, Morikawa continued to press.
The lead was down to one when two-time major winner Morikawa rolled in a 30-foot birdie putt on the par-three 12th, while Scheffler missed his attempt from a third of that distance.
The advantage was back to two when Morikawa bogeyed the 16th, but Scheffler dropped a shot on the 17th to leave him with a one-shot lead with one to play.
Both players overhit their approaches to the final green but both then chipped out to around five feet. Scheffler was up first and rolled his effort into the middle of the cup to seal the win and $4m (£3.14m) first prize.
Amid the celebrations Morikawa knocked in his par putt to close with a one-under 71 and seven under total.
Straka, who had been level with Morikawa on six under at the start of the day, fell away with a run of four bogeys in five holes from the 10th, but a chip-in birdie at the last saw him finish with a 76 to end joint fifth on two under.
England's Matt Fitzpatrick, who won the 2022 US Open, holed six birdies in a three-under 69 to also finish on two under, alongside Sweden's Ludvig Aberg (74).
Rory McIlroy closed with a 76 to end two over, one ahead of England's Tommy Fleetwood who also shot a 76.
Ireland's Shane Lowry, who was playing with Northern Ireland's McIlroy, had a disastrous round which included seven bogeys, two doubles and a triple-bogey seven on the 17th as he shot a 13-over-par 85 to finish 12 over.