"The second shot, it just came a little too quick," Salas said. "Throughout the day, I was just really anxious and hit a lot of pulls today. I was just not myself today."
Salas chipped to 15 feet, watched Park hole her birdie putt, then two-putted for 6.
Park increased her lead to seven on the par-5 second, holing a 7-footer. She couldn't get birdie tries to fall on the next three holes, then dropped a stroke on the par-4 sixth after driving into the left-side water, ending her bogey-free run at 27 holes.
Park made a 22-footer for birdie on the par-3 eighth and got to 15 under with a 5-foot putt on the par-5 ninth. She made another bogey on the par-10th, leaving her four strokes ahead of Ryu.
Park made a 25-foot birdie putt on the par-4 12th and a 10-footer on the par-4 13th to push her lead back to six at 16 under. She nearly made it three straight birdies, but her 12-footer lipped out on the par-3 14th. She missed a short putt to bogey the par-3 17th, and closed with a par.
Lewis, the 2011 winner, tied for 32nd at 1 under after a 72.
After winning consecutive events in Singapore and Phoenix to take the top spot in the world from Yani Tseng, Lewis tied for ninth two weeks in Carlsbad and was never in contention at Mission Hills.
"It's been crazy," said Lewis. "I expected to get the attention at the tournaments and at the course, but I've been surprised at things off the course."
DIVOTS: Suzann Pettersen (69) and Caroline Hedwall (68) tied for third at 9 under. ... Tseng closed with a 74 to tie for 48th at 2 over. Winless in more than a year, she dropped to No. 3 in the world. ... Lydia Ko, the 15-year-old New Zealand amateur who won the Canadian Women's Open last August to become the youngest LPGA Tour champion, had a 69 to tie for 25th at 2 under.
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