
The Swiss player has 6,330 points to rank ahead of Spain's Rafael Nadal (5,930) and Australian Open champion Novak Djokovic of Serbia (5,130).
Nikolay Davydenko of Russia moves up one place to fourth, with David Ferrer of Spain slips to fifth.
ATP top 10 as of March 10 (previous ranking in parenthesis):
1. (1) Roger Federer, Switzerland, 6,330 points
2. (2) Rafael Nadal, Spain, 5,930
3. (3) Novak Djokovic, Serbia, 5,130
4. (5) Nikolay Davydenko, Russia, 2,750
5. (4) David Ferrer, Spain, 2,730
6. (6) Andy Roddick, United States, 2,380
7. (7) David Nalbandian, Argentina, 2,050
8. (8) Richard Gasquet, France, 1,885
9. (9) James Blake, United States, 1,710
10. (10) Tomas Berdych, Czech Republic, 1,685.