Na Yeon Choi has matched the best third round in U.S. Women's Open history.
After 54 holes at Blackwolf Run, the No. 3 ranked player in the world from South Korea beat the rest of the field by roughly 12 shots on average as she took a commanding six-shot lead over her closest competitor in an attempt to capture her first major championship.
Choi shot a tournament-best seven-under-par 65 on an afternoon when nearly everyone else went in the opposite direction.
Second-round leader Suzann Pettersen shot a 78. Her playing partner, Michelle Wie, matched Pettersen's six-over-par total. And Yani Tseng, the No. 1 player in the world, fell out of contention with her own 78.
World No. 2 Stacy Lewis had an 80. And former U.S. Women's Open champion Karrie Webb stumbled to an 81.
You get the picture. The golf course was playing with the degree of difficulty expected from a U.S. Open track and most of the tournament's participants suffered the consequences of windy conditions on top of firm and fast terrain.
It will take a monumental collapse for Choi to surrender her six-shot lead, but there is a group of capable contenders waiting in the wings for her to do just that.
It's Na Yeon Choi's tournament to lose, but here are six players who could walk away with the 2012 U.S. Women's Open Championship.