Jeju Island - Brooks Koepka has improved his chances of taking over as the No 1 golfer in the world, shooting a 5-under 67 on Saturday to take a four-stroke lead after three rounds of the CJ Cup at Nine Bridges.
Koepka had a three-round total of 13-under 203. Ian Poulter, who shot 68 Saturday, was tied for second place with second-round leader Scott Piercy, who had a 72.
The 28-year-old Koepka, who trailed by one stroke after two rounds, will move to the top of the world rankings if he wins the tournament and former No 1 Justin Thomas, the defending champion here, does not finish any better than second.
Thomas shot a 71 on Saturday and is at 1-under, 11 strokes behind Koepka and tied for 43rd.
Dustin Johnson is currently No 1, Koepka is second and Thomas third.
There were six golfers tied for fourth, including Rafa Cabrera Bello, who shot 65 Saturday, and first-round leader Chez Reavie (70).
Shubhankar Sharma of India had the round of the day, a 64, to move to 3-under, 10 strokes behind Koepka.
Leading scores from the third round of the CJ Cup at Nine Bridges in Jeju Island, South Korea, on Saturday (USA unless stated):
203 - Brooks Koepka 71-65-67
207 - Ian Poulter (ENG) 70-69-68, Scott Piercy 70-65-72
208 - Rafa Cabrera Bello (ESP) 73-70-75, Cameron Smith (AUS) 74-67-67, Jamie Lovemark 72-68-68, Pat Perez 72-68-68, Gary Woodland 73-67-68, Chez Reavie 68-70-70
209 - Ted Potter Jr. 77-67-65, Jason Day (AUS) 73-71-65, Ryan Armour 73-67-69
210 - Paul Casey (ENG) 71-73-66, Brendan Steele 74-71-65, Kim Si-woo (KOR) 69-73-68, .J.J. Spaun 71-70-69
211 - Hideki Matsuyama (JPN) 71-74-66, Keith Mitchell 75-69-67, J.B. Holmes 73-70-68, Ryan Palmer 72-70-69