Hamburg - Dinara Safina continues to lead while Jelena Jankovic improves to fourth in the women's tennis rankings issued on Monday by the WTA.

Russia's Safina has improved to 9,810 points, with Wimbledon champion Serena Williams and sister Venus remaining second and third ahead of Serbia's Jankovic.

Italy's Flavia Pennetta moves up two places to 10th, while Nadia Petrova of Russia slips out of the leading 10.

WTA top 10 as of August 17 (previous ranking in parenthesis): <# 1. (1) Dinara Safina, Russia, 9,810 2. (2) Serena Williams, United States, 8,558 3. (3) Venus Williams, United States, 6,865 4. (5) Jelena Jankovic, Serbia, 6,620 5. (4) Elena Dementieva, Russia, 6,235 6. (6) Svetlana Kuznetsova, Russia, 5,960 7. (7) Vera Zvonareva, Russia,
5,300 8. (8) Caroline Wozniacki, Denmark, 4,810 9. (9) Victoria Azarenka, Belarus, 4,553 10. (12) Flavia Pennetta, Italy, 3420 <# (dpa)