San Francisco: World No. 1 Lydia Ko, seeking to add a third major title to her resume, birdied the 18th to take a one-shot lead after three rounds of the US Women’s Open on Saturday.

The 19-year-old New Zealander had three birdies and one bogey on a blustery day on the CordeValle course in San Martin, California, her two-under 70 giving her a seven-under par total of 209 and a one-stroke lead over South Koreans Park Sung-Hyun and Ji Eun-Hee.

Park, a five-time winner on the Korean LPGA Tour who is playing in her first US Open, held a two-stroke overnight lead. She carded a two-over par 74 to join Ji, who signed for a 70, on 210.