Inbee Park picked up her fourth LPGA Tour title on Sunday in Thailand, but remained No. 4 in this week's women's world rankings.

In fact, the top 11 in the rankings were unchanged from last week. World No. 1 Yani Tseng was again followed by Na Yeon Choi, Stacy Lewis, Park, Shanshan Feng, Jiyai Shin, Suzann Pettersen, So Yeon Ryu, Ai Miyazato, Mika Miyazato and Cristie Kerr.

Catriona Matthew improved two to No. 12 and Paula Creamer held steady in 13th. Karrie Webb dipped a pair to 14, while Amy Yang and Azahara Munoz inched up one apiece to 15th and 16th.

Sun Ju Ahn slid two notches to No. 17 and she was again followed by Brittany Lincicome, Angela Stanford and Chie Arimura, who remained Nos. 18-20.

Lydia Ko, a 15-year-old amateur, shared 14th in Thailand and improved one to No. 25. Ariya Jutanugarn, who triple-bogeyed the final hole to lose a near- certain victory in Thailand, soared 109 places to 62nd this week.