Sung Kang, the former PGA TOUR regular who played last year on the Web.com Tour, won the Kolon Korea Open after leader Kim Hyung-tae was docked two strokes for grounding his club late in the final round.
Kang shot a final-round 69 to win the OneAsia event by a shot over five players, including world No. 6 Rory McIlroy, who shot 67 to tie for second.
Kim, the 54-hole leader, was heading towards victory when rules officials said he grounded his club in a hazard on the 13th hole. Kim argued that he hadn't grounded the club, causing a two-hour delay in which rules officials reviewed footage of the incident.
Kim eventually signed for a six on the par-4 hole, and he ended up with a final-round 77.
McIlroy's tie for second was his best finish in a worldwide event since his solo second in the Valero Texas Open in April.