Haas, who also won the Bob Hope Classic, is one of seven multiple winners this year.
Michael Allen, 51, shot 71 and finished in second place at 276.
Former Clemson golfer D.J. Trahan (69) and Brendon de Jonge (72) tied for third at 277.
Augusta native Charles Howell and former Louisville, Ga., resident Brian Gay both closed with 69s. Howell finished tied for 23rd place at 283 and Gay tied for 29th at 284.
CHAMPIONS TOUR: In Conover, N.C., Gary Hallberg shot a record-setting 11-under 61 to win the Ensure Classic by one stroke over Fred Couples.
Hallberg, 52, finished at 18-under 198, tying the event record at the Rock Barn Golf and Spa and winning his first career Champions Tour title. Hallberg bettered the final-round record of 62, set by Bob Tway earlier in the day.
"You never think you're going to win," said Hallberg, who became the seventh first-time winner on the 50-and-over tour this season. "You look at the players -- guys like Fred Couples and Bernhard Langer -- who are champions, and you think 'Even if I play my best, how am I going to beat those guys?' "
Larry Mize shot 69 and tied for 17th. Fellow Augusta native Jim Dent shot 77 and finished 77th.
NATIONWIDE TOUR: In San Jacinto, Calif., Australian Steven Bowditch shot a final-round 3-under-par 68 to set the tournament record of 19-under and win the Soboba Golf Classic.
Bowditch made birdie at the first and eagle at the sixth, and was never seriously challenged.
Daniel Summerhays also shot 68 to finish alone in second place.