Shin moved up one spot and pushed Lorena Ochoa, who recently announced her retirement, to No. 2. Shin is the third woman to be ranked No. 1 in the world. Annika Sorenstam led the list from its February 2006 inception until Ochoa took over in April 2007. Ochoa had been No. 1 for 158 weeks.
Ochoa, who has asked the ranking group to withdraw her name as soon as possible, said she was retiring as an active tour member following last week's Tres Marias Championship. She came in sixth at the event.
With Shin's new spot the highlight, only two of the Top 13 places were unchanged this week with Cristie Kerr keeping the No. 6 place and Anna Nordqvist in seventh.
Ai Miyazato, who won the Tres Marias, jumped from fifth to third, forcing Yani Tseng to fourth and Suzann Pettersen to fifth.
Michelle Wie improved one spot to eighth, switching places with Karrie Webb. Choi No-yoen and Kim In-kyung each moved up two spots, with Choi in 10th and Kim in 11th, that forced Angela Stanford down two to 12th and Paula Creamer from 11th to 13th.