Oldest Players to Reach No. 1
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| Rank | Player | Age at No. 1 | Date |
|---|---|---|---|
| 21 |  Boris Becker | 23y 9m 11d | 1991-09-02 |
| 22 |  Juan Carlos Ferrero | 23y 8m 15d | 2003-10-27 |
| 23 |  Guillermo Vilas | 23y 4m 26d | 1976-01-12 |
| 24 |  Jim Courier | 23y 0m 20d | 1993-09-06 |
| 25 | Carlos Alcaraz | 22y 8m 14d | 2026-01-19 |
| 26 |  Marcelo Rios | 22y 7m 22d | 1998-08-17 |
| 27 | Carlos Moya | 22y 6m 23d | 1999-03-22 |
| 28 |  Lleyton Hewitt | 22y 3m 16d | 2003-06-09 |
| 29 | Andy Roddick | 21y 4m 27d | 2004-01-26 |
| 30 |  Marat Safin | 21y 2m 20d | 2001-04-16 |