Berlin - Roger Federer heads the first men's tennis rankings of 2010, released Monday by the ATP.
The Swiss, who lost to Nikolay Davydenko in the semi-finals of the Qatar Open in Doha last week, has 10,550 points, followed by Spain's Rafael Nadal on 9,310 points.
The only change in the Top Ten sees Juan Martin del Potro leapfrog Great Britain's Andy Murray into fourth place.
ATP top 10 as of January 11 (previous ranking in parenthesis):
1. (1) Roger Federer, Switzerland, 10 550 points
2. (2) Rafael Nadal, Spain, 9 310
3. (3) Novak Djokovic, Serbia, 8 310
4. (5) Juan Martin del Potro, Argentina, 6 785
5. (4) Andy Murray, Great Britain, 6 780
6. (6) Nikolay Davydenko, Russia, 4 930
7. (7) Andy Roddick, United States, 4 510
8. (8) Robin Soderling, Sweden, 3 410
9. (9) Fernando Verdasco, Spain, 3 300
10. (10) Jo-Wilfried Tsonga, France, 2 875