Ko drops down leaderboard at Swinging Skirts

Lydia Ko, of New Zealand, hands off her putter while walking off the eighth green of the Lake Merced Golf Club during the first round of the Swinging Skirts. Photo / AP.

Bogeys on 15 and 17 have seen Lydia Ko drop down the leaderboard at the Swinging Skirts in San Francisco.

Ko had a share of the lead midway through her back nine of her second round, at seven under, but has now dropped to five under par and a tie for 4th.

Japan's Haru Nomura has a three shot lead at nine under with a handful of holes to play, with Australia's Minjee Lee and Korean So Yeon Ryu tied for second.