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ATP is to men's tennis..
The organization releases a weekly ranking of the players's performance in the tour. This is a list of players who have achieved the number one position in singles since the rankings' inception in 1975:
| # | Player | Country | Date Reached | Weeks |
|---|---|---|---|---|
| 1 | Chris Evert | United States | 3 November 1975 | 262 |
| 2 | Martina Navratilova | United States | 10 July 1978 | 331 |
| 3 | Tracy Austin | United States | 7 April 1980 | 22 |
| 4 | Steffi Graf | Germany | 17 August 1987 | 377 |
| 5 | Monica Seles | United States | 11 March 1991 | 178 |
| 6 | Arantxa Sánchez Vicario | Spain | 6 February 1995 | 12 |
| 7 | Martina Hingis | Switzerland | 31 March 1997 | 209 |
| 8 | Lindsay Davenport | United States | 12 October 1998 | 37 |
| 9 | Jennifer Capriati | United States | 15 October 2001 | 17 |
| 10 | Venus Williams | United States | 25 February 2002 | 11 |
| 11 | Serena Williams | United States | 8 July 2002 | 57 |
| 12 | Kim Clijsters | Belgium | 11 August 2003 | 12 |
| 13 | Justine Henin Hardenne | Belgium | 20 October 2003 | 44 |
| 14 | Amelie Mauresmo | France | 13 September 2004 | present |