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Choi Na-Yeon rolled in a 45-foot eagle putt on 18 to cap an eight-under par 63 for a two-shot lead after the second round of the NW Arkansas Championship on Saturday.
The 27-year-old Choi heads into Sunday's final round with a slight cushion over South Korean compatriot and first-round leader Hur Mi-Jung and Sweden's Anna Nordqvist.
Choi finished two rounds at 13-under 129 which broke the tournament's 36-hole scoring record.