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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | 20y 85d | Next Gen ATP Finals 2018 | |
| 2 | 20y 261d | Masters Cup 2001 | |
| 3 | 21y 90d | Tour Finals 2019 | |
| 4 | 21y 171d | Masters Cup 2008 | |
| 5 | 21y 205d | Tour Finals 2018 | |
| 6 | 21y 259d | Masters Cup 2002 | |
| 7 | 22y 93d | Masters Cup 2003 | |
| 8 | 23y 87d | ATP Tour Finals 2024 | |
| 9 | 23y 99d | Masters Cup 2004 | |
| 10 | 24y 78d | Tennis Masters Cup 2000 | |
| 11 | 24y 85d | ATP Finals 2025 | |
| 12 | 24y 208d | Tour Finals 2021 | |
| 13 | 24y 226d | ATP Tour World Championships 1998 | |
| 14 | 24y 279d | Tour Finals 2020 | |
| 15 | 25y 96d | Masters Cup 2006 | |
| 16 | 25y 137d | Masters 1971 | |
| 17 | 25y 167d | Tour Finals 2012 | |
| 18 | 26y 90d | ATP Tour World Championships 1997 | |
| 19 | 26y 95d | Masters Cup 2007 | |
| 20 | 26y 132d | Masters 1972 |
