MEN'S TOUR:Roger Federer has enough computer points to remain number one for many more months even if he didn't play another match until Wimbledon. But Rafael Nadal is still a strong number two who could challenge Federer's reign if he wins more titles on hardcourt, grass and indoor surfaces.
1. Roger Federer 2. Rafael Nadal 3. Andy Roddick 4. Nikolay Davydenko 5. Tommy Robredo 6. Novak Djokovic 7. Fernando Gonzalez 8. Ivan Ljubicic 9. James Blake 10. Andrew Murray
Former grand slam winners currently ranked outside the top 10:
18. Juan Carlos Fererro 20. Lleton Hewitt 26. Marat Safin 33. Carlos Moya

WOMEN'S TOUR:
Justine Henin is a worthy number one but I think the most feared woman on tour is Serena Williams. If she can stop getting injured, she can dominate anybody. She beat Henin in the Miami final and second-ranked Maria Sharapova in the Australian Open final. So really, Serena is more of an unofficial number two because she is playing far better, and far more dominating tennis than anyone ranked above her.
Here are the official WTA rankings:
1. Justine Henin 2. Maria Sharapova 3. Amelie Mauresmo 4. Kim Clijsters 5. Svetlana Kuznetsova 6. Martina Hingis 7. Jelena Jankovic 8. Nicole Vaidisova 9. Nadia Petrova 10. Dinara Safina
Former grand slam winners currently ranked outside the top 10:
12. Serena Williams 22. Venus Williams 34. Anastasia Myskina 63. Lyndsay Davenport (Davenport currently inactive).