SAN FRANCISCO (AFP) - World number one Lydia Ko birdied the second play-off hole to beat Morgan Pressel on Sunday and win a second straight Swinging Skirts LPGA Classic title.

Ko, the New Zealand sensation who turned 18 on Friday, earned her first victory as a professional at this event last year.

With the win, she notched her seventh LPGA Tour title and fifth since the start of the 2014 season.

She fired a two-under 70 in the final round to finish 72 holes tied with Pressel at eight-under 280.

Pressel signed for a fourth-round 72.

She had birdie putts to win both in regulation and at the first play-off hole but instead remains in search of her third LPGA Tour title and a first since 2008.