Hahn shot a 4-under 67 and joined Parel at 13-under 271. Both players had pars on the par-4 No. 18, and Hahn birdied the par-5 No. 9 while Parel had a par on the second playoff hole.
Hahn earned $99,000 for the victory. He started the day four strokes behind third-round leader B.J. Staten, but made his move early with three birdies on his first five holes.
He had his fifth birdie of the round on the par-4 No. 13 and closed his round with five pars.
Jin Park (67), Staten (72) and Jim Renner (71) finished at 272.