A dramatic birdie at the final hole gave Matt Kuchar his first victory of the season in the RBC Heritage at Harbour Town Links.
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The American, who already has six top-10 finishes to his name this season, holed his bunker shot at the difficult 18th at Hilton Head to take him clear of closest challenger Luke Donald.
The Englishman, who started the day with a two-shot lead, still had three holes to play but was unable to find the birdie required to force a play-off.
Kuchar, who briefly held a share of the lead in the final round of the Masters last week, began the final round four behind the leader but tore up the front nine in just 30 shots to take the lead with Donald struggling off the tee.
He pushed his drive out of bounds at the sixth, racking up a double bogey, and then pulled his opening shot at the 10th into water, causing another dropped shot.
However, on both occasions he immediately hit back with birdies to keep himself in the hunt and another birdie at the 12th got Donald to 10 under par.
The birdies dried up for Kuchar on the back nine after he reached -11 with his seventh birdie of the day on 10, but when he three-putted from just four feet at the 17th it looked like he had left the door ajar.
His second to the 18th came up short but his perfect splash out put the pressure back on Donald, who was unable to respond - his own chip to the final hole narrowly skipping by.
"I watched (Brian) Harman's putt go right, when I played it there was a gust of wind and it went a little left," Kuchar said of the three-putt on 17 after signing for a sensational 64. "It was blowing hard and I missed my putt coming back, it was disappointing.
"I wasn't too disappointed to end up in that front bunker on 18, it was a decent leave and I knew it was a pretty easy up and down.
"I told my caddy I was about due to make one of these and it was so cool to see it disappear in the end."
Kuchar's consistency sees him move up to sixth in this year's FedEx Cup standings.
Donald's closing 69 put him one shot ahead of third-placed American pair Ben Martin (67) and John Huh (69), with a further two back to Brian Stuard and Scott Brown.