Hadley began the day five strokes behind third-round leader Danny Lee but finished at 19-under 265 and earned $112,500 for his first win on the tour.
Hadley -- who played at Georgia Tech -- had five birdies on the back nine at TPC Wakefield and nearly eagled the par-4 18th to overtake Lee.
Lee took a four-stroke lead into his final round and led most of the day, but bogeyed two of his final four holes and finished at 267.
Edward Loar (68) finished at 268 while Ben Martin (66) and Josh Broadway (69) were at 269.
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