Jordan Spieth birdied four of five holes on the back nine Sunday to force a playoff, then he parred the second extra hole to defeat Tom Gillis and win the John Deere Classic for a second time.
Spieth closed with a 3-under 68 to meet Gillis at 20-under-par 264. Gillis, who was three groups ahead of Spieth, fired a 7-under 64.
The duo returned to the 18th at TPC Deere Run for the first extra hole. They both found the green with their approach shots and 2-putted for par.
They returned to No. 18 again. After Spieth found the right rough on the first extra hole, Gillis did so the second time through. Gillis' second landed in the water left of the green.
Spieth dropped his second shot from the fairway onto the green. He rolled his long birdie putt inside four feet. After Gillis failed to hole his bogey chip, Spieth tapped in for the win.
The Masters and U.S. Open champion also won this title in 2013 in a playoff.
For Gillis, the consolation prize was a trip to next week's Open Championship.
Zach Johnson, the 2012 winner, fired a 6-under 65 and was joined in third place at minus-19 by last week's Greenbrier champion Danny Lee (67).
Johnson Wagner (67), Chris Stroud (63) and Justin Thomas (67) tied for fifth at 18-under-par 266.