In what developed into a titanic battle over the closing stages many players had chances to win but Haas found the fairway at the last, hit his approach at the par five to 30 feet and when he had two putted he had broken through.
Haas is in his 5th season on the PGA Tour, his previous best finish had been third on two occasions.
Matt Kuchar, Tim Clark and Bubba Watson all finished just one shot back while long time leader and Tour rookie Alex Prugh finished another shot back in 5th position. Just under twelve months ago Prugh won the New Zealand Open en route to securing his card via the Nationwide Tour.
The leading Australian was Matt Jones who after an early bogey produced a round of 66 to finish in a share of 8th position and earned $150,000 for his efforts.
Steve Elkington was 15th, John Senden 39th, Rod Pampling 42nd and Greg Chalmers 57th and Michael Sim 63rd.