Youngest Players at Top 9
The youngest player ever to enter the ATP Top 9 is Aaron Krickstein, who first appeared at 17y 0m 11d on 1984-08-13. The second youngest is Michael Chang (17y 3m 21d on 1989-06-12). Third is Boris Becker (17y 7m 16d). 34 players in this list entered the Top 9 before their 21st birthday.
| Top | Player | Age at Top 9 | Date |
|---|---|---|---|
| 1 | 17y 0m 11d | 1984-08-13 | |
| 2 | 17y 3m 21d | 1989-06-12 | |
| 3 | 17y 7m 16d | 1985-07-08 | |
| 4 | 17y 11m 4d | 1982-07-26 | |
| 5 | 17y 11m 28d | 1974-06-03 | |
| 6 | 18y 1m 8d | 1988-06-06 | |
| 7 | 18y 9m 7d | 1993-06-07 | |
| 8 | 18y 10m 22d | 2005-04-25 | |
| 9 | 18y 11m 20d | 2022-04-25 | |
| 10 | 19y 0m 27d | 1983-09-12 | |
| 11 | 19y 0m 29d | 1990-09-10 | |
| 12 | 19y 0m 30d | 1985-02-18 | |
| 13 | 19y 1m 23d | 1990-11-05 | |
| 14 | 19y 2m 28d | 2000-05-22 | |
| 15 | 19y 3m 14d | 1984-09-10 | |
| 16 | 19y 6m 17d | 1987-07-20 | |
| 17 | 19y 7m 9d | 1978-09-25 | |
| 18 | 19y 9m 1d | 2023-01-30 | |
| 19 | 19y 10m 11d | 2007-04-02 | |
| 20 | 19y 11m 6d | 2002-08-05 |
