Hamburg - American Serena Williams remains top of a virtually unchanged women's tennis rankings issued Monday by the WTA ruling body.

Williams leads the rankings with 9,982 points followed by Russia's Dinara Safina on 9,021.

Sister Venus Williams moves up one place to fifth, leapfrogging Russian Vera Zvonareva while Ana Ivanovic of Serbia is also up one spot to seventh.

WTA top 10 as of February 23 (previous ranking in parenthesis):

"#" 1. (1) Serena Williams, US, 9,982 2. (2) Dinara Safina, Russia, 9,021 3. (3) Jelena Jankovic, Serbia, 8,460 4. (4) Elena Dementieva, Russia, 8,266 5. (6) Venus Williams, US, 6,814 6. (5) Vera Zvonareva, Russia, 6,320 7. (8) Ana Ivanovic, Serbia, 5,562 8. (7) Svetlana Kuznetsova, Russia, 5,381 9. (9) Nadia Petrova, Russia, 3,882 10.(10) Agnieszka Radwanska, Poland, 3,448 "#" (dpa)