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Potter became the sixth first-time winner on the tour this season. He earned $1,098,000 and jumped from 173rd to 51st in the FedEx Cup standings.

The 28-year-old left-hander had missed five straight cuts entering the Greenbrier Classic and his previous best finish was a tie for 13th.

It marked the third straight year of close finishes on the Old White TPC Course. Scott Stallings beat Bob Estes and Bill Haas on the first hole of a playoff last year, and Stuart Appleby shot a 59 to beat Jeff Overton by a stroke in 2010.

Charlie Wi and rookie Charlie Beljan tied for third at 14 under. Wi shot a 65, and Beljan had a 67.

Webb Simpson lost a one-stroke lead on the back nine at the tournament for the second straight year. The U.S. Open champion made three straight bogeys, shot 73 and tied for seventh at 11 under.