Lydia Ko grabs lead at U.S. Women's Open

The Kiwi teenager carded a two-under 70 in the third round at the CordeValle Golf Club in San Martin, California, to move to seven under.

Ko, a two-time major winner at the age of 19, is a shot clear on what is a congested top part of the leaderboard.

Park Sung-hyun, who held a two-shot overnight lead, struggled to a 74 to be in a tie for second with fellow South Korean Ji Eun-hee (70).

Ko holed three birdies and a bogey throughout her third round, having moved into contention with a 66 on Friday.

A birdie on the final hole helped her into the outright lead and she said the conditions were far different from the second round.

"I think the biggest difference was the wind," Ko told Fox Sports.

"It was breezy from the morning so I knew it would play a lot tougher than yesterday."

American Brittany Lang (68) and Amy Yang (73) are tied for fourth at five under, while Angela Stanford (71) is a shot further back.