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.

Chun In-gee shot a three-under 69 on Friday to extend her leading score at the Women's PGA Championship to 11 under – six strokes better than anyone else through two rounds.

The South Korean, who is a two-time major winner, led by five strokes after the first round, and extended that by one more with five birdies and two bogeys in her second trip around the course. In doing so, she is the only player to shoot both rounds in the 60s.

Leading the chasing pack at five under is Australian Lydia Ko and American Jennifer Kupcho, with Ko's 67 tying for Friday's round of the day along with Lexi Thompson.

Thompson sits in a tie for ninth at three under, along with recent U.S. Open winner Minjee Lee and China's Xiyu Lin.

Heading into the weekend there are 26 women below par, including representatives from Thailand, Northern Ireland, Japan, Finland, England and South Africa.