Pernilla Lindberg from Sweden is the leader at 14-under. The first major championship of the year, which at one point looked like it might be a two-person runaway, now goes to Sunday with one of the more fascinating leaderboards in recent major memory.
Lindberg set the ANA's 36-hole record on Friday at 12 under, sharing the mark with Sung Hyun Park. Olson did win 20 times at North Dakota State University and took the 2009 U.S. Girls Junior.
Park (74) is four back at 10-under in a pack of players that also includes Park In-bee, Moriya Jutanugarn, Jennifer Song, Jodi Ewart Shadoff and Charley Hull at 10-under par.
Sung Hyun Park, who shared the lead with Lindberg through 10 holes Saturday before the back nine bedeviled herto the tune of a 74, is also in the group at 10 under; she won two tournaments, including a major, previous year as a rookie.
The South Korea is one-over-par after two rounds of the major. She also missed a four-foot par try on 13. 1 and 6. The one on No. 6 was especially important since it followed her first bogey of the week on the previous hole.
"Obviously it's going to be different", she said.
Lindberg started her round tied with Park at 12-under. Her four coming in included back-to-back birdies to cap her round. I just said, 'Let's just have fun. "The gap to the leaders widened but I'm in a good position". No matter what happens on Sunday, it has already been a week for the memory books. "I'm going to try to keep that putter hot". Lindberg teed off on 10 and had three birdies on her outward run.
With little fanfare five groups in front of the Thompson-Wie morning pairing, the fourth-ranked Park shot a 64 for the best round of the week.
Notes: Ryu won previous year in a playoff over Lexi Thompson, who was penalized four shots with six holes to play in regulation because of a rules violation Saturday - two shots for improperly marking her ball, two shots for the incorrect scorecard.
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Park said she had not even been aware of her score.
"It was a rough day out there today", Park said.
The 42-year-old English veteran made the quarterfinals at last week's Dell Technologies Match Play to improve his world ranking to 51st - just missing the cutoff to move into the top 50 and earn an invitation to Augusta National, where he has never missed the cut in a dozen appearances.
"Even though there were a couple things that I missed, but overall just had a great round". Lindberg left the course that day and played tourist with her parents. It was all just part of her plan to stay as relaxed as possible.
Olson has a similar plan to handle the pressure.
"The first two days I was hitting it really well, but I just didn't make any putts", Lee said. "There are a lot of names bunched up there. I can draw on that tomorrow".
She ultimately played in eight events on the PGA Tour and made the cut in a men's tournament on the Asian Tour.
In contrast to her demeanor in recent years, Wie exuded a peaceful, easy feeling during her media availability, punctuating many of her answers with a laughter that called to mind the buoyant teen she was before the game crippled her body and crushed her confidence. Will Lindberg and Olson hold up? He shot 73 and was five shots back.