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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | 19y 328d | Masters 1978 | |
| 2 | 20y 85d | Next Gen ATP Finals 2018 | |
| 3 | 20y 92d | ATP Tour World Championships 1991 | |
| 4 | 20y 196d | ATP Tour World Championship 1990 | |
| 5 | 20y 261d | Masters Cup 2001 | |
| 6 | 21y 8d | Masters 1988 | |
| 7 | 21y 90d | Tour Finals 2019 | |
| 8 | 21y 171d | Masters Cup 2008 | |
| 9 | 21y 205d | Tour Finals 2018 | |
| 10 | 21y 259d | Masters Cup 2002 | |
| 11 | 21y 311d | Masters 1981 | |
| 12 | 22y 93d | Masters Cup 2003 | |
| 13 | 22y 114d | Masters 1974 | |
| 14 | 22y 316d | Masters 1982 | |
| 15 | 23y 87d | ATP Tour Finals 2024 | |
| 16 | 23y 95d | ATP Tour World Championships 1994 | |
| 17 | 23y 99d | Masters Cup 2004 | |
| 18 | 23y 216d | Masters 1979 | |
| 19 | 23y 313d | Masters 1989 | |
| 20 | 23y 317d | Masters Cup 2005 |
