Si-woo Kim continues to sit atop the leaderboard after moving four-strokes clear at the Wyndham Championship on Saturday.
After blitzing the field to hit the front in Friday's second round with a flawless 60, Kim was at it again on the penultimate day, carding a six-under-par 64.
Kim, whose second-round score saw him fall just short of becoming only the seventh player in PGA Tour history to post a 59, improved to 18 under for the tournament thanks to seven birdies, picking up shots at the first, second, fifth, eighth, 13th, 15th and 18th holes at Sedgefield Country Club.
The South Korean's nearest rival is Rafa Cabrera Bello.
Cabrera Bello, who finished tied for fifth at the Olympic Games in Rio and shared the lead at Wyndham after the opening round, rocketed back into contention via a five-under-par 65.
A stroke further back at 13 under is former world number one Luke Donald after he recorded a third-round 64, alongside Jim Furyk (67) and Kevin Na (67).
Furyk stole the show with a stunning 62-foot putt for eagle at the 15th hole.
Graeme McDowell (64), Billy Horschel (64), Brandt Snedeker (65) and Hideki Matsuyama (68) are six shots off the pace.
Scott Langley (62), D.A. Points (63), Johnson Wagner (65) and Bill Haas (65) round out the top 10 at 11 under overall.
Meanwhile, Rickie Fowler is 10 shots behind Kim following his two-under-par 68.