Haas pulled away from a crowd of contenders with three straight birdies, two key pars, and one good hop out of the rough. It led to a 5-under 66 on a muggy day at Congressional in Bethesda, Md., and a three-shot win over Roberto Castro.

Haas led by at least two shots the entire back nine, though he never allowed himself to think about winning until he stood over a 3-foot par putt on the 18th hole and realized he had three putts to win.