Jang Ha-na held her nerve to claim a maiden LPGA Tour title at the 2016 Coates Golf Championship in Florida.
Jang came into the final round tied for the lead with Lydia Ko, but an even-par 72 saw her claim a two-stroke victory and the $225,000 prize money.
"It's amazing how I feel right now," Jang said following her victory.
The South Korean, who was runner-up at the event last year, began the tournament with a seven-under-par 65 and showed a consistent display over the next few days to finish 11-under 277.
She claimed the title with birdies on two of the last three holes, with 18-year-old Canadian Brooke Henderson eventually finishing in second after she surrendered the lead with a pair of three-putt bogeys over the final five holes.
Ko dropped off in the middle part of the round and finished equal third alongside the Korean duo of Chun In-gee and Kim Sei-young.