Hamburg - 
Swiss tennis star Roger Federer is in danger of losing his his number one ranking as Spanish heir apparent Rafael Nadal continues to make up ground in the latest ATP rankings released Monday.
Federer, who has been number one since the beginning of February 2004, has seen his lead over Nadal been cut to 670 points.
The third and fourth ranked players, Novak Djokovic and Nikolay Davydenko, have also managed to close the gap.
ATP top 10 as of April 7 (previous ranking in brackets):
1. (1) Roger Federer, Switzerland, 6,600 points; 2. (2) Rafael Nadal, Spain, 5,930; 3. (3) Novak Djokovic, Serbia, 4,785; 4. (4) Nikolay Davydenko, Russia, 3,175; 5. (5) David Ferrer, Spain, 2,570; 6. (6) Andy Roddick, United States, 2,260; 7. (7) David Nalbandian, Argentina, 2,070; 8. (9) James Blake, United States, 1,920; 9. (10) Tomas Berdych, Czech Republic, 1,875; 10.
(8) Richard Gasquet, France, 1,885. (dpa)
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