South Korea's Choi wins US Women's Open
Choi, 24, fired a one-over 73 at Blackwolf Run for a seven-under total of 281 and a four-shot victory over another South Korean, Amy Yang.
Choi had gone into the final round with a six-shot lead thanks to a remarkable 65 in Saturday's wind-whipped third round.
Yang carded a one-under 71 for a three-under total of 285, with no other players finishing under par for the event.
Choi's triumph came on the same course where Se Ri Pak won the 1998 US Women's Open, a victory Choi recalls watching on television as a girl.