Berlin - Victoria Azarenka continues to top the women's tennis rankings, while Serena Williams of the United States moves up a place to third.
China's Li Na also improved one position to seventh in the rankings issued on Monday by the WTA.
Azarenka of Belarus has improved slightly to 10 955 points, while second-placed Maria Sharapova is up to 9 135 points.
Williams remained at 7 900 points, but Poland's Agnieszka Radwanska slipped to fourth on 7 265.
WTA Top 10:
2. Maria Sharapova (RUS) 9 135
3. Serena Williams (USA) 7 900
4. Agnieszka Radwanska (POL) 7 265
5. Petra Kvitova (CZE) 6 595
6. Angelique Kerber (GER) 5 470
7. Li Na (CHN) 5 095
8. Sara Errani (ITA) 4 855
9. Samantha Stosur (AUS) 4 400
10. Marion Bartoli (FRA) 4 010