Ji Eun-hee of South Korea rolled in a 20-foot birdie putt on the last hole to win the U.S. Women's golf Open in Pennsylvania for her maiden championship title.
The 23-year-old Ji's downhill putt at the 18th completed an even-par 71 for a level-par 284 total which beat Candie Kung of Taiwan by one stroke.
Kung, who began the day five strokes behind overnight leader Cristie Kerr, fired a two-under-par 69 for 285.
Kerr, the 2007 champion who had led the tournament after the second and third rounds, had trouble avoiding the rough in the final round and finally relinquished the lead when her four-foot par putt at the 13th lipped out.
The American, who held a two-shot lead over playing partner Ji at the start of the day, registered a 75 to finish on 286, tied with South Korean Kim In-kyung, who shot 70.