The 24-year-old Mouw triumphed in his 20th start on the tour when third-round leader Paul Peterson - who was playing the 10th hole at Kentucky's Hurstbourne Country Club when Mouw finished - missed a 55-foot birdie try from the front fringe on the 18th.

"I was mentally ready for a play-off," Mouw said. "But that wasn't the case and I'm just blessed to be the winner."

Mouw receives a two-year exemption and a PGA Championship spot next year, but not a spot in the Masters.

"I have job status for two more years and I get to use that to play some really good golf and try to win another golf tournament," Mouw said. "But as to my life, it doesn't change my life very much."

Peterson shot a 69 to finish a stroke back in the opposite-field PGA Tour event also sanctioned by the DP World Tour.

Mouw birdied the first three holes and added two more on Nos. 7-8 in a front-nine 30. He birdied Nos. 10, 11, 13 and 17 on the back nine in the lowest score in his brief PGA Tour career. 

He's the third rookie to win this season, following Australia's Karl Vilips in the Puerto Rico Open and South African Aldrich Potgieter at the Rocket Classic.

"I knew that if everything clicked and I did the right things, I could go pretty low. I'm just thrilled that it happened," he said.

The 37-year-old Peterson, also making his 20th career PGA Tour start, made a 24-foot birdie putt on 14 and a 30-footer on 16, then parred the final two holes.

European tour player Manuel Elvira was third at 7 under at 66, and Kentucky native Vince Whaley (70) and David Skinns (70) followed at 6 under.