The 29-year-old Piercy, 2007 Ultimate Game winner, opened with rounds of 64, 62 and 65 en route to a 22-under 264 total on the Crestview Country Club course.
He earned $94,500 to jump from 123rd on the money list to 35th with $118,749. The top 25 at the end of the season will earn 2009 PGA Tour cards.
Summerhays and Levin finished with 67s, and Haas closed with a 70.
Piercy made a 20-foot birdie putt on the par-3 17th after Levin holed a 45-footer of his own for birdie.
Spencer made that putt ' a bomb. It was a huge putt for him, Piercy said. For me to make it on top of him, it takes all the wind from his sails. To make that at that time you cant ask for anything more.
Levin had his best finish on the tour.
I had no chance after Scott made that putt on 17, Levin said. Im a little bummed that last putt cost me some money but I still moved up from where I started today. I would have taken this at the beginning of the week.