McIlroy made the perfect start with an eight foot birdie putt, but found the lake at the short third. Behind him Laird's six footer on the first meant Westwood trailed for the first time in the tournament and they shared the next three.
There was to be no comeback from Hanson. He had his third bogey in five holes at the 14th and was shaking hands on the next green when Wilson matched his birdie three to clinch a 4 and 3 victory.
McIlroy and Bae were still level after seven and Westwood got back on terms with Laird by getting up and down from sand at the short sixth, his opponent flying the green and then chipping off the other side.
Mahan admitted he was surprised at how poorly Kuchar played given "the level of game he has", while the short-hitting Wilson commented: "They talk about it being a bomber's course, but you have to hit it straight too."
That point was proved by the last two winners - Ian Poulter and Donald are by no means big-hitters - and Wilson had had only six bogeys in four games.
McIlroy nosed in front again with a six foot birdie putt on the 576 yard eighth, but he was under a bush off the tenth tee, took a penalty drop and bogeyed to be back at all square.
Westwood, meanwhile, was gifted the sixth, seventh and ninth, Laird missing all three greens and bogeying to go from one up to two down at the turn.
McIlroy went two-up with birdies at the 11th and 13th and Westwood held the same advantage with six to play. Laird's fourth bogey in five holes came after he drove into the desert at the tenth, but he took the next when he chipped to three feet and saw his opponent three-putt.
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