Youngest Players to Reach No. 9
The youngest player ever to reach ATP No. 9 is Goran Ivanisevic, who achieved this milestone at 19y 3m 18d on 1990-12-31. The second youngest is Juan Martin del Potro (20y 3m 6d on 2008-12-29). Third is Alberto Mancini (20y 7m 5d). A total of 44 players have ever reached No. 9. 3 of them did so before turning 21.
| Rank | Player | Age at No. 9 | Date |
|---|---|---|---|
| 1 | 19y 3m 18d | 1990-12-31 | |
| 2 | 20y 3m 6d | 2008-12-29 | |
| 3 | 20y 7m 5d | 1989-12-25 | |
| 4 | 21y 7m 11d | 1985-12-30 | |
| 5 | 22y 7m 9d | 1982-12-27 | |
| 6 | 22y 7m 29d | 1992-12-28 | |
| 7 | 22y 8m 25d | 2006-12-25 | |
| 8 | 22y 9m 17d | 1996-12-30 | |
| 9 | 22y 11m 26d | 2004-12-27 | |
| 10 | 23y 2m 20d | 2025-12-29 | |
| 11 | 23y 11m 7d | 1991-12-30 | |
| 12 | 24y 0m 1d | 1999-12-27 | |
| 13 | 24y 2m 14d | 1975-12-29 | |
| 14 | 24y 3m 10d | 1976-12-27 | |
| 15 | 24y 3m 10d | 1995-12-25 | |
| 16 | 24y 10m 16d | 2021-12-27 | |
| 17 | 25y 1m 28d | 2022-12-26 | |
| 18 | 25y 3m 22d | 1998-12-28 | |
| 19 | 25y 5m 22d | 1988-12-26 | |
| 20 | 25y 9m 16d | 1984-12-31 |
