Hahn shot 4-under 67 and joined Parel at 13-under 271.
In the playoff, both players opened with pars on the par-4 No. 18. Hahn then birdied the par-5 ninth while Parel had a par.
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.
Parel earned $59,400 to move up to No. 20 on the Nationwide money list.
NCAA: In Los Angeles, Texas won its third NCAA men’s golf championship, defeating Alabama on a 20-foot birdie putt by senior Dylan Frittelli on Sunday at Rivera.
With the match tied at two, Frittelli came to the 18th hole all square with Cory Whitsett. After Whitsett’s birdie chip came up well short, Frittelli drained his birdie opportunity.
Alabama took the first two of the five matches. Hunter Hamrick defeated Julio Vegas 6 and 5, while Bobby Wyatt beat Toni Hakula, 1 up.
Texas won the next two matches. Jordan Spieth closed out fellow freshman Justin Thomas 3 and 2, and Cody Gribble went 3-0 in match play, defeating Scott Strohmeyer 2 and 1.
CHAMPIONS TOUR: In West Des Moines, Iowa, Jay Haas finished at 16-under 197 to win the Principal Charity Classic by five strokes, becoming the first golfer to win the event three times.
Haas, the winner at Glen Oaks Country Club in 2007 and 2008, led by three shots heading into Sunday and made it stand up with 5-under 66. Haas’s 16-under tied the tournament mark set by Gil Morgan in 2006 and matched the largest victory of the season on the tour.
Kirk Triplett set the course record with 9-under 62 and finished second at 11-under 202 along with Augusta native Larry Mize.
LPGA TOUR: In Galloway, N.J., Stacy Lewis shook off a rough stretch in the middle of the final round and finished with even-par 71 to win the ShopRite LPGA Classic by four strokes over Katherine Hull.
Lewis finished 54 holes at the Stockton Seaview Hotel and Golf Club at 12-under par 201. It was her third LPGA win and her second of the year. She likely will be the top-ranked American when the LPGA rankings are updated today.
EUROPEAN TOUR: In Newport, Wales, Thailand’s Thongchai Jaidee survived a poor start to win the Wales Open by one shot after a final round 1-over 72 in wet conditions. He finished 6-under 278 for his fifth European Tour title.