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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | 18y 312d | Monte Carlo Masters 2005 | |
| 2 | 18y 333d | Rome Masters 2005 | |
| 3 | 18y 362d | Madrid Masters 2022 | |
| 4 | 19y 230d | Monte Carlo Masters 1994 | |
| 5 | 19y 244d | Hamburg Masters 1994 | |
| 6 | 19y 318d | Monte Carlo Masters 2006 | |
| 7 | 19y 339d | Rome Masters 2006 | |
| 8 | 19y 354d | Madrid Masters 2023 | |
| 9 | 20y 24d | Rome Masters 2017 | |
| 10 | 20y 96d | Monte Carlo Masters 1991 | |
| 11 | 20y 249d | Hamburg Masters 1995 | |
| 12 | 20y 249d | Hamburg Masters 1996 | |
| 13 | 20y 277d | Hamburg Masters 2002 | |
| 14 | 20y 315d | Monte Carlo Masters 2007 | |
| 15 | 20y 337d | Rome Masters 2007 | |
| 16 | 20y 349d | Rome Masters 2008 | |
| 17 | 21y 16d | Madrid Masters 2018 | |
| 18 | 21y 84d | Rome Masters 2001 | |
| 19 | 21y 116d | Monte Carlo Masters 1997 | |
| 20 | 21y 118d | Hamburg Masters 2003 |
