Carlota Ciganda beat Alison Lee with a birdie on the first hole of a playoff in the rainy LPGA Championship in Incheon, Korea after each player lost big leads.
The 26-year-old Spaniard won with a six-foot putt after Lee's birdie chip from the rough off the back edge of the green missed a half-inch to the right.
Ciganda overcame a five-stroke deficit to Lee on the front nine, then blew a five-stroke lead on the final five holes - getting into the playoff when Lee bogeyed the par-5 18th after hitting her third shot into the water.
Ciganda played the final five holes in four over - making a double bogey on 14 and bogeys on 16 and 18 - for a two-over 70 at Sky 72 in the event that had an emotional start with Se Ri Pak ending her Hall of Fame career Thursday in front of her home fans.
Three-strokes ahead of US Women's Open champion Brittany Lang entering the day, Lee had a 75 to match Ciganda at 10-under 278 on the Ocean Course. The 21-year-old American, still a student at UCLA, is in her second season on the tour.
Ciganda won her first LPGA Tour title and became the third European winner this year, joining Sweden's Anna Nordqvist and Germany's Caroline Masson.
China's Shanshan Feng (70) and South Korea's Min-Sun Kim (71) tied for third at eight under.
Lexi Thompson, the winner last year, had a 73 to tie for 13th at four under. Second-ranked Ariya Jutanugarn (69) and No. 3 Gee Chun (71) also were four under.
Su Oh was the best placed Australian at one-under in a tie for 29th.
Top-ranked Lydia Ko closed with a 74 to tie for 51st at three over.