I’m just so happy to be here playing, and to come out here and win is unbelievable.

American Tyler Duncan hoists the RSM Trophy after beating Webb Simpson in a playoff for his first US PGA Tour title (AFP Photo).

WASHINGTON (AFP) — Tyler Duncan birdied the second playoff hole to edge Webb Simpson and claim his first US PGA Tour title at the RSM Classic in Sea Island, Georgia.

The 30-year-old American, who returned to the PGA Tour this season with a 12th-place finish in the Korn Ferry Tour Finals, powered into the playoff with birdies at three of his last four holes, including a 25-foot birdie at the 72nd to cap a five-under par 65.

That put him in the clubhouse on 19-under 263, where Simpson joined him after birdies at 15 and 16 and a five-foot par putt 18 to cap a 67.

Both players parred the first playoff hole, the par-four 18th.

When they returned to play it again Simpson was in the left rough while Duncan again found the fairway, eventually draining a 12-footer to seal the victory.

“I’m just so happy to be here playing, and to come out here and win is unbelievable,” said Duncan, whose tournament included a career-best 61 on Friday that he followed with a 70 that left him four off the overnight lead held by Brendon Todd.

“I knew it was going to be a tough day out here, it was colder and the wind picked up,” Duncan said. “I was just trying to do the best that I could and fight to the end.”

He said it was “one of the best four-irons I’ve ever hit” that left him a six-foot birdie putt at the 17th, which he followed with his 72nd-hole flourish.