Youngest Players to Reach No. 4
The youngest player ever to reach ATP No. 4 is Mats Wilander, who achieved this milestone at 19y 4m 4d on 1983-12-26. The second youngest is Andre Agassi (20y 8m 2d on 1990-12-31). Third is Alexander Zverev (20y 8m 5d). A total of 38 players have ever reached No. 4. 3 of them did so before turning 21.
| Rank | Player | Age at No. 4 | Date |
|---|---|---|---|
| 1 | 19y 4m 4d | 1983-12-26 | |
| 2 | 20y 8m 2d | 1990-12-31 | |
| 3 | 20y 8m 5d | 2017-12-25 | |
| 4 | 21y 1m 4d | 1988-12-26 | |
| 5 | 21y 3m 15d | 1992-12-28 | |
| 6 | 21y 7m 14d | 2008-12-29 | |
| 7 | 22y 4m 9d | 2023-12-25 | |
| 8 | 22y 10m 18d | 2002-12-30 | |
| 9 | 22y 11m 11d | 1993-12-27 | |
| 10 | 23y 2m 12d | 1991-12-30 | |
| 11 | 23y 4m 15d | 2021-12-27 | |
| 12 | 24y 4m 29d | 1978-12-25 | |
| 13 | 24y 6m 25d | 2000-12-25 | |
| 14 | 24y 8m 18d | 1980-12-29 | |
| 15 | 24y 10m 2d | 2005-12-26 | |
| 16 | 24y 10m 17d | 2020-12-28 | |
| 17 | 24y 11m 0d | 2004-12-27 | |
| 18 | 25y 6m 22d | 1981-12-28 | |
| 19 | 25y 9m 6d | 1997-12-29 | |
| 20 | 25y 9m 14d | 1999-12-27 |
