New Zealand teenager Lydia Ko extended her lead atop the Rolex Women's World Golf Rankings released Monday after she won the Marathon Classic for her fourth LPGA Tour victory of the season.
Ko birdied the fourth playoff hole to win a playoff Sunday at the tournament in Sylvania, Ohio.
The 19-year-old Ko won for the 14th time in her career. She has remained No. 1 for the 39th consecutive week and is currently three weeks away from tying Annika Sorenstam on the all-time career weeks list at the top of the Rolex Rankings. Ko has spent 58 total weeks at No. 1 in her career.
Ko has a 15.47-point average as the top five spots are unchanged from the previous week.
Brooke Henderson, an 18-year-old Canadian, is second at 8.37, followed by South Korea's Inbee Park (7.88). Lexi Thompson (7.76) is No. 4 as the top American, followed South Korea's Sei Young Kim (6.87.)
American Stacy Lewis is No. 8 after moving up one spot.