McIlroy seized control with a 35-foot eagle putt from just off the green on the par-5 14th and then playing mistake-free down the stretch for a 6-under 66 and a one-victory.
Fowler, who started the final round with a two-shot lead as he tried to end nearly three years without a victory, faded with a pair of three-putts and shot 71 to tie for third. The threat came from Morikawa, a member at The Summit Club, who shot 29 on the front to get in the mix and closed with an eagle for a 62.
“It is a big carrot,” McIlroy said of the 20 wins. “I didn’t know it would be this week.”
He went into the weekend nine shots out of the lead, made up plenty of ground with a 62 on Saturday and then pulled away by taking advantage of the scoring holes.
Morikawa was watching from the balcony overlooking the 18th green to see if he would get a chance for extra holes, though it was asking a lot for McIlroy to drop a shot on the par-5 closing hole. McIlroy laid back off the tee, played short of the green and hit wedge to the back pin to assure a two-putt par and another trophy.
“Being me is enough,” he said. “Being me can let me do things like this.”
Keith Mitchell, who had a five-shot lead going into the weekend until a 73 in the third round, closed with a 67 and tied for third with Fowler.
Fowler was poised to end a 32-month drought by starting the final round with a two-shot lead and looking as though he was intent on finishing it off. He made an 8-foot birdie putt on No. 4 that became a two-shot swing when McIlroy had a careless three-putt bogey.
That began to change on the par-5 sixth. From the middle of the fairway, Fowler pulled a fairway metal into the desert, took a penalty drop, and then three-putted from 35 feet for a double bogey. McIlroy made birdie and just like that they were tied, along with others farther along in the round.
Talor Gooch holed out for eagle on the par-5 18th for a 62. Morikawa went out in 29 and was tied for the lead. Robert Streb also was tied for the lead at that point at 21-under par.
McIlroy was looking at potential bogey, coming out of a fairway bunker well short of the green on the 10th and facing a tough flop shot over another bunker to a tight pin. Fowler had 18 feet for birdie. McIlroy hit to inches away for par, while Fowler gunned his birdie chance some 5 feet by the hole and missed that for a three-putt bogey.
Fowler never caught up.
Morikawa ran out of momentum. Sure, he closed with a birdie that forced McIlroy to play mistake-free over the final four holes, but the British Open champion failed to take advantage of birdie chances on the reachable par-4 12th and the par-5 14th with an iron from the fairway.
“Whenever you shoot 62 you’re always going to be pleased,” Morikawa said. “But I thought I left a few out there, especially with some putts. But overall I’m very pleased the way this last 18 went, especially at a course that I’ve played a lot. I felt very comfortable and it’s a good way to start the season.”
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