Association of Tennis Professionals

The Association of Tennis Professionals (ATP) was formed in 1972 in order to protect the interests of male professional tennis players. The ATP has a tour that comprises tennis tournaments with ATP Masters Series, ATP International Series Gold, ATP International Series and ATP Challenger Series. Players also participate in the 4 Grand Slams, which are organized by the ITF. The ATP tour also oversees the World Team Cup played in Düsseldorf in May and the senior's Tour of Champions.

Rankings

ATP publishes weekly rankings of professional players, ATP Entry Ranking, a 52-week rolling ranking and ATP Race, a year to date rankings. The Entry Ranking is used for determining qualification for entry and seeding in all tournaments for both singles and doubles. The Entry Ranking period is the cumulative points earned in the past 52 weeks, except for the Tennis Masters Cup, whose points are dropped following the last ATP event of the year. The player with the most points by season's end is the World Number 1 of the year.

Number ones

23 players have held the number 1 ranking since the official rankings were released in 1973. Listed are their names and the number of weeks they have held the ranking:

• 1. Pete Sampras 286
• 2. Ivan Lendl 270
• 3. Jimmy Connors 268
• 4. Roger Federer 219
• 5. John McEnroe 170
• 6. Björn Borg 109
• 7. Andre Agassi 101
• 8. Lleyton Hewitt 80
• 9. Stefan Edberg 72
• 10. Jim Courier 58
• 11. Gustavo Kuerten 43
• 12. Ilie Năstase 40
• 13. Mats Wilander 20
• 14. Andy Roddick 13
• 15. Boris Becker 12
• 16. Marat Safin 9
• 17. John Newcombe 8
• 18. Juan Carlos Ferrero 8
• 19. Thomas Muster 6
• 20. Marcelo Ríos 6
• 21. Yevgeny Kafelnikov 6
• 22. Carlos Moyà 2
• 23. Patrick Rafter 1

• 1. Roger Federer 219
• 2. Jimmy Connors 160
• 3. Ivan Lendl 157
• 4. Pete Sampras 102
• 5. Jimmy Connors (2) 84
• 6. Pete Sampras (2) 82
• 7. Ivan Lendl (2) 80
• 8. Lleyton Hewitt 75
• 9. John McEnroe 58
• 10. John McEnroe (2) 53
• 11. Andre Agassi 52
• 12. Björn Borg 46
• 13. Ilie Năstase 40
• 14. Björn Borg (2) 34
• 15. Gustavo Kuerten 30
• 16. Andre Agassi (2) 30
• 17. Pete Sampras (3) 29
• 18. Jim Courier 27
• 19. Stefan Edberg 24
• 20. Jim Courier (2) 22
• 21. Stefan Edberg (2) 22
• 22. Mats Wilander 20

• If Federer stays ranked #1, he will break Jimmy Connors' record on 23 March 2009, Ivan Lendl's record on 6 April 2009 and Pete Sampras' record on 27 July 2009.
• Rafael Nadal has held the number 2 ranking for a record 141 weeks.

Last updated: 7 April 2008