Florida: Casey, 41, led by one overnight but dropped three shots on the opening nine as a pack of players applied pressure.
The Englishman was level with Jason Kokrak at eight under on the 18th but the American made bogey, meaning Casey needed a par four at the last to win.
He found a bunker off the tee but hit the green from there and two-putted for a first win since last year’s victory.
“It feels cool,” said Casey, who made bogey on 17 to fall back to eight under alongside Kokrak. “It was messy but this course was so difficult and I did make errors. Looking at 72 holes, it was hard work.”
Casey’s win means European golfers have won the past three PGA Tour events, following Rory McIlroy’s victory at the Players Championship and Francesco Molinari’s success at the Arnold Palmer Invitational.
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