Byeong Hun An overcame a challenging day to set up a thrilling final-round showdown with fellow South Korean Tom Kim at the top of the Genesis Championship leaderboard.
The home favourite had birdied the most holes during the first two rounds and looked set to accelerate from the chasing pack when he picked up a shot at the first on a glorious Saturday at Jack Nicklaus Golf Club Korea.
However, he only picked up two more shots, alongside two bogeys, in his one under 71 to sit alongside Kim at 12 under par.
The pair are one shot ahead of Antoine Rozner, who carded a seven-under 65 to initially set the clubhouse target, and Ricardo Gouveia and Francesco Laporta in Incheon.
Gouveia, who started the week in 154th place in the rankings, moved up to provisional 107th after carding a three-under 69 to boost his chances of earning his playing rights for next season.
Rasmus Neergaard-Petersen, Rikuya Hoshino and Alejandro Del Rey are at ten under, with Brandon Stone, Daniel Hillier and first round leader Ivan Cantero are one shot further back.