World No 6 Rory McIlroy blew his chances of breaking his 2013 winning drought after a four-over third-round 75 left him 10 shots behind at the Kolon Korea Open.
The Northern Irishman began the day two off the pace in a share of fifth, but after a frustrating front nine in which he missed a number of chances he went backwards quickly after the turn.
The 24-year-old went out in level par at the Woo Jeong Hills Country Club course near Cheonan after his only birdie of the day – at the par-five fifth – was cancelled out by a bogey at the next.
A double-bogey six at the 10th were the first of four dropped shots in five holes as McIlroy, who has not won since changing his clubs at the start of the year, fell further behind as he finished the day one-over for the tournament.
Although overnight leader Hong Soon-sang could manage only a level-par 71, dropping him into second on five under, Kim Hyung-tae shot a 66, the joint best round of the week, to take a four-shot cushion into the final day.