World No. 1 Lorena Ochoa moved into the lead with a five-under 67.
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Ochoa made birdies on 17 and 18 for a three-under 34 on the back nine.
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Cristie Kerr finished four shots back after a two-under 70.
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In-Kyung Kim shot a one-under 71 and trails Ochoa by one stroke.
5 of 5Don Heupel/AP
Mi Hyun Kim finished with a 75 to drop five behind the lead.
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