Weir secured the win with a 6-foot par putt after hitting his approach on the par-4 18th into a greeside bunker.

The 2003 Masters champion took the lead with a birdie on the par-4 15th, rolling a chip shot to a foot, then held off Hensby over the final three holes on a warm, blustery day at Grayhawk Golf Club.

Weir finished at 14-under 266 for his eighth PGA Tour victory, and first since the 2004 Nissan Open, a span of 87 starts.

Hensby closed with a 69.

Billy Mayfair, a Scottsdale resident and Arizona State product, shot a 68 to finish third at 10 under.

Carl Pettersson, who led after three rounds, and Sean O'Hair tied for fourth at 9 under. Pettersson shot a 74, and O'Hair had a 69.

O'Hair briefly shared the lead after birdieing the 16th. But he double-bogeyed the 17th and bogeyed No. 18 to drop out of contention.

Play crawled along as players coped with 25 mph gusts, which kicked up dust in the desert bordering Grayhawk's 7,125-yard Raptor Course.

Pettersson opened the day with a one-stroke lead over Hensby and Weir.

By the second hole, they were all tied for the lead. But Pettersson dropped another stroke on the par-3 fifth hole, and fell behind by bogeying the 10th, 11th and 12th.