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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | 19y 262d | Next Gen ATP Finals 2018 | |
| 2 | 19y 276d | Tennis Masters Cup 2000 | |
| 3 | 20y 47d | Masters Cup 2008 | |
| 4 | 20y 85d | Next Gen ATP Finals 2018 | |
| 5 | 20y 86d | Masters 1972 | |
| 6 | 20y 90d | Tour Finals 2021 | |
| 7 | 20y 162d | Masters Cup 2006 | |
| 8 | 20y 173d | Masters Cup 2007 | |
| 9 | 20y 192d | Tour Finals 2023 | |
| 10 | 20y 197d | Tour Finals 2023 | |
| 11 | 20y 206d | ATP Finals 2017 | |
| 12 | 20y 261d | Masters Cup 2001 | |
| 13 | 20y 288d | Next Gen ATP Finals 2018 | |
| 14 | 20y 290d | Next Gen ATP Finals 2018 | |
| 15 | 20y 304d | Tennis Masters Cup 2000 | |
| 16 | 21y 8d | Next Gen ATP Finals 2018 | |
| 17 | 21y 16d | Next Gen ATP Finals 2018 | |
| 18 | 21y 59d | Tour Finals 2009 | |
| 19 | 21y 71d | Masters Cup 2003 | |
| 20 | 21y 74d | ATP Tour World Championships 1997 |
