Rookie Cody Gribble produced a bogey-free final round to win the Sanderson Farms Championship in Mississippi by four shots.
The 26-year-old struggled on the opening day as he carded a one-over-par 73, but he headed into the final day one shot behind Chris Kirk and Luke List.
Gribble, who has played in just eight PGA Tour events, sealed victory on Sunday with a round of 65, which included seven birdies.
Kirk, List and Greg Owen finished 16-under-par for the tournament, four strokes behind Gribble, while Xander Schauffele moved up nine places in the field by carding a final-day 66.
