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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 SelesMonica Seles (born December 2, 1973), originally Monika Sele is an accomplished female tennis player winner of many competitions including nine Grand Slam titles. Seles was born in Novi Sad, Yugoslavia (now Vojvodina, Serbia and Montenegro). She is an eth | United States | 11 March 19911991 like 2002, is a palindromic year. It also has the same calendar as 2002, including Easter on March 31. It is a common year starting on Tuesday. Events January January 2 Sharon Pratt Dixon is sworn in as mayor of Washington, DC becoming the first blac | 178 |
| 6 | Arantxa Sánchez VicarioArantxa Sanchez Vicario 1 (born June 18, 1971) is a former tennis player from Barcelona, Spain. She is the sister of Javier and Emilio Sanchez, also professional tennis players. In 1989, the then virtually unknown Sanchez Vicario joined Michael Chang of t | SpainThe Kingdom of Spain is a country located in the southwest of Europe. It shares the Iberian Peninsula with Portugal, Gibraltar and Andorra. To the northeast, along the Pyrenees mountain range, it borders France and the tiny principality of Andorra. It inc | 6 February 1995 | 12 |
| 7 | Martina Hingis | Switzerland | 31 March 1997 | 209 |
| 8 | Lindsay Davenport | United States | 12 October 1998 | present |
| 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 | 5 |