He carded a 67 to finish at 22-under-par 266 for his sixth PGA Tour victory, leaving the 32-year-old only three short of catching his father, Jay Haas.
Fellows Americans Matt Kuchar (67), Charley Hoffman (64), Brendan Steele (64), Steve Wheatcroft (67) and South Korean Park Sung Joon (65) tied for second on 21-under.
Kuchar had the best chance to get to 22-under, but he missed a 10-foot birdie at the par-five 18th.
Haas parred the final hole but it was anything but routine after he pushed his drive and his ball stopped in the short rough just a couple of inches above the lip of a bunker.
He took an awkward stance in the sand with the ball above his feet, almost at waist height, which left him needing to execute almost perfect contact to avoid potential disaster.
“I could have whiffed (missed) that shot,” Haas told Golf Channel after choking down on an iron and successfully punching the ball 80 yards forward.
He eventually tapped in to secure the $1.026 million first prize in front of a gallery that included former U.S. President Bill Clinton, whose foundation is a partner in the tournament.
Haas was as surprised as anyone with his success in his first event since early November.
He suffered a fractured left wrist when he fell down stairs last April, which hindered his 2014 campaign.
"I didn’t think I’d be able to score this week,” he said. “I was really struggling hitting it where I wanted to hit it (but the) putter was unbelievably hot the first few days.
“Today, still I was fighting (my swing). I was grinding it out until the end. This is unbelievable.”
(Reporting by Andrew Both in Cary, North Carolina, editing by Gene Cherry)
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