JEJU, Korea, Republic Of - Justin Thomas fired a 2-under-par 70 to share the lead with fellow American Scott Brown after the third round of the CJ Cup on Saturday.
Thomas offset a lone double bogey and a bogey with five birdies to reach the clubhouse at 9-under 207.
Brown had back-to-back bogeys on Nos. 10 and 11 but recovered with two birdies on the back nine, adding to the one he had on the par-4 No. 5 for a 71.
Anirban Lahiri of India moved into a share of third place with Australian Marc Leishman (71) after a 69 that included four birdies and a bogey.
Whee Kim (70) was the highest placed of the 16 South Korean players in the field, tied for fifth after a 72.
Overnight leader Luke List struggled with the windy conditions and fell into a tie for eighth place after a 76. List had three bogeys on the front nine and a pair of double bogeys on the back nine.
Jason Day also struggled with the wind, carding a 71 to be tied for 16th.
Nick Taylor of Abbotsford, B.C., is the top Canadian. He's 4 under after a 72. Adam Hadwin, also of Abbotsford, shot a 4-over 76 and is 7 over.