Ko extends lead atop world ranking

Philadelphia, PA ( - Lydia Ko won for the second straight week and she extended her lead atop the women's world rankings.

Ko, who won the Ladies European Tour event in her homeland of New Zealand, pushed her lead atop the rankings from 1.33 average points to 1.41 average points.

She was again followed by Inbee Park, Stacy Lewis and Shanshan Feng. Michelle Wie and Suzann Pettersen exchanged places for the second week in row. Pettersen moved back to fifth as Wie dipped to sixth.

Hyo-Joo Kim inched up one to seventh as So Yeon Ryu fell one to No. 8. Karrie Webb remained No. 9.

Amy Yang earned her second LPGA Tour title on Sunday at the Honda LPGA Thailand. That helped Yang jumped six spots to No. 10. She was followed by Lexi Thompson, Q Baek, Anna Nordqvist, Na Yeon Choi and Azahara Munoz, who all dropped one spot.

Mirim Lee jumped a pair to 16th, while Brittany Lincicome tumbled a pair to 17th. Cristie Kerr dipped one to 18th. Jessica Korda moved up one spot to 19th and that knocked Sun Ju Ahn down one to 20th.