The 27-year-old Mahan had an eagle and a pair of birdies in a late four-hole span today to finish at 16-under 268 for his second PGA Tour victory. The first came at the Travelers Championship in 2007. Mahan closed with consecutive 6-under 65s to finish at 16-under.
Fowler, just 21 and a tour rookie, had a final-round 68 for the second runner-up finish of his young career, both of them in Arizona.
Augusta native Charles Howell shot a second consecutive 68 and tied for fourth at 271.
Evans resident Vaughn Taylor shot 68 for the fourth day in a row and finished seventh at 272.