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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | 20y 261d | Masters Cup 2001 | |
| 2 | 21y 59d | Tour Finals 2009 | |
| 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 87d | ATP Tour World Championships 1998 | |
| 8 | 22y 88d | Tour Finals 2023 | |
| 9 | 22y 93d | Masters Cup 2003 | |
| 10 | 22y 189d | ATP Finals 2025 |
