Park Sung-hyun is headed back to the world number one spot after a birdie at the first playoff hole lifted her to a US LPGA victory over Lizette Salas in Indianapolis.
South Korean Park’s third victory of the season sees her vault from fourth in the rankings to supplant Thailand’s Ariya Jutanugarn at the top.
Ariya, who needed a top-five finish to stay at the summit if Park won, finished tied for seventh.
Both Park and Salas finished 72 holes at the Brickyard Crossing Golf Course on 23-under par 265.
Salas started the day with a two-shot lead and was up by one until a bogey at the 17th. The American had a chance to close out the victory in regulation but missed a birdie attempt at the 72nd hole.
She carded a final-round 70 while Park, who also had a chance to seal the win at the last hole in regulation, posted a 68.
South Korean Amy Yang was third after a 69 for 266, and South Korean Ko Jin-young was fourth, posting a 67 for 268.