Lydia Ko fired a 3-wood to three feet for eagle at the first extra hole to end a 22-month winless streak at the LPGA Mediheal Championship.
The victory marks the 21-year-old's 15th LPGA title and first since July 2016, a 43-event stretch marked by changes in instructors, caddies and equipment and a large weight loss.
Ko led by one heading into the final round and got off to a slow start with three bogeys, but she responded on the back nine and went on to defeat Minjee Lee with the shot of the tournament at the first extra hole.
"My whole team and my family, they've worked really hard for this moment,'' said Ko. ''I'm happy that a few of them are here and we can celebrate together.''
''It's crazy because I was 3-over for the day at one stage and I said, 'Hey, you've just got to focus and you never know what's going to happen,.
"'I was able to kind of put my game together on the back nine. When that putt dropped, I was like, 'Oh, my God.'"