Park takes lead into last round
A round of 66 saw Park Inbee open up a two-shot lead at the end of day three in the Lorena Ochoa Invitational.
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The South Korean carded six birdies in a flawless display to move to 15 under for the tournament, clear of Cristie Kerr.
American Kerr scored six birdies to one bogey to improve her overnight position by one place with a round of five-under 67.
Park's compatriot Ryu So Yeon picked up five shots to also post a round of 67 which took her to 12 under overall.
However, overnight leader Angela Stanford could only manage a level-par 72 and had slipped to fourth by the end of the third round, four shots off the pace.
Frenchwoman Karine Icher occupied fifth spot on nine under, one shot ahead of a group of four players including Michelle Wie and Candy Kung of Chinese Taipei.
Defending champion Catriona Matthew of Scotland recovered from an average first two days to go round the course in Guadalajara in four under, although she was 10 shots off the lead.