Hamburg - Rafael Nadal of Spain continues to top the men's ATP tennis rankings, with the leading five unchanged.

Jo-Wilfried Tsonga exchanges places six and seven with compatriot Gilles Simon in the only change in the top 10.

ATP top 10 as of January 12 (previous ranking in parenthesis):

1. (1) Rafael Nadal, Spain, 13,160 points 2. (2) Roger Federer, Switzerland, 10,700 3. (3) Novak Djokovic, Serbia, 10,590 4. (4) Andy Murray, Britain, 7,190 5. (5) Nikolay Davydenko, Russia, 5,330 6. (7) Jo-Wilfried Tsonga, France, 3,995 7. (6) Gilles Simon, France, 3,960 8. (8) Andy Roddick, US, 3,940 9. (9) Juan Martin del Potro, Argentina, 3,890 10. (10) James Blake , US, 3,550 " (dpa)