Park shattered the former 54-hole scoring record at the event, finishing three rounds at 15-under-par 201. Her performance bested Suzann Pettersen's 2010 mark by three strokes.
Moving into sole possession of second place at 13-under was Cristie Kerr, who carded a 5-under 67.
Third place went to So Yeon Ryu, who also registered a 67 to end one shot further back at 12-under 204.
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