See Woo Kim is on top of the leaderboard heading in to the final round of the Valero Texas Open.
The South Korean is a shot ahead of Canada's Corey Conners while Charley Hoffman is two shots back.
Meanwhile Scott Brown, Jhonattan Vegas and Kyoung-Hoon Lee are four shots off the pace.
The winner of the tournament will secure the last spot in next week's Masters tournament.
The final round gets underway later on Sunday.