Two time AIG Women's Open champion Jiyai Shin of South Korea signed for a 67 to reach 7-under and take a one-shot lead.
Shin's 67 was her lowest round in the AIG Women's Open since a second round 64 in 2012 at Royal Liverpool.
“Well, I try to, well, I played a long time, the golf," said Shin. "So this is my third. I've been here already third time. This is my third time at St Andrews. That's how much I played it, for so long. I have a lot of experience with links course and with not like this tough wind but pretty much I have a lot of good experience. So that's why I take all my skill today. Yeah, the wind -- really, the wind is nice to me today, and also, I made a bogey -- two bogeys today but I think everyone can make one or two bogeys. So this is nothing. I just keep focused forward.”
Seven of the last eight champions have held the lead or a share of the lead going into the final round. The only one who did not was England's Georgia Hall in 2-18 who was one stroke behind Pornanong Phatlum of Thailand after 54-holes.
American defending champion Lilia Vu lies in second place at 6-under after carding a 71.
“The wheels were falling off in the middle of it. I was getting anxious but my caddie was able to give me words of encouragement that I'm playing well. It's just a couple bad breaks. I was able to birdie 16, and most importantly par 17, and then finish with a birdie 18 going into tomorrow,” said Vu.
Compatriot and overnight leader Nelly Korda shot a 75 to move down into third place at 5-under followed in fourth place at 4-under by South Korea's Jenny Shin and New Zealand's Lydia Ko who shot rounds of 70 and 71 respectively.
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