Jim Furyk's near three-year wait for a 14th PGA Tour title was extended through four hours of weather delays before he finally clinched the Tampa Bay Championship by one stroke.

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In a final round disrupted by thunderstorms, the former US Open champion shot a two-under-par 69 for a 13-under tournament total and his first PGA Tour win in 59 starts since the 2007 Canadian Open.

The 39-year-old American scrambled to make bogey at the last after driving into the trees, needing to two-putt from 30 feet to claim victory over South Korea's KJ Choi in second place.

"I have a habit of making it tough on myself. I always make it interesting and starting on 17 the nerves got to me a little bit," Furyk, who will rise from ninth to seventh in the world on the back of the victory, told the Golf Channel.

Bubba Watson (68) finished at 11-under in third, while his fellow-American Nick Watney (67) was fourth on nine-under-par.

Choi, who began the round three strokes behind Furyk, pulled level with the American on 12-under after four birdies over his first six holes but his charge faltered and he posted a 67.

"All I can say is I tried my best today. My shots felt great," said Choi, twice a winner of the event on the Copperhead Course.

"You know, my hat is off to Jim, because he just played fantastic. I tried to put some pressure early in the round with some birdies, but he was patient enough to hang in there and play well."

Ireland's three-time major champion Padraig Harrington shot a disappointing one-over 72 for the second day in a row to finish in a group of five players on six-under and tied for eighth.