A third major title remains in play for Chun In-gee but she opened the door for the rest of the Women's PGA Championship field in Saturday's third round at the Congressional Country Club.
Chun was in control after the opening two rounds with respective scores of 64 and 69 on the Blue Course, but finished Saturday with a three-stroke lead from a three-way tie for second after a three-over 75.
The world number 33 was leading by four strokes when her second shot on the par-five 16th faded sharply into the tall wire grass, before a shank into the trees on the other side of the fairway resulted in a drop, finishing the hole with a double-dogey.
A three-putt from Kim Sei-young on the par-four 17th put her level with Lexi Thompson and Choi Hye-jin on five-under for the tournament, minimising the damage for Chun.
Meanwhile, Hannah Green remains in striking distance coming into the final round, despite bogeys on the 10th and 18th holes to put her back to even-par for the day, and four-under for the tournament.