In the fourth and final round, Ames needed a 4-under 68 to avert a playoff against Clark, who closed with a 6-under 66.
Ames' winning total was 17-under 271.
"It's nice to be back in the winner's circle again," Ames said after his third PGA Tour win.
The win was worth $828,000.
Clark has earned the most career money without a win on the PGA Tour.
Verplank’s chances were spoiled by bogeys on two of the last three holes.