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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | 15y 301d | Monte Carlo Masters 2002 | |
| 2 | 16y 207d | Madrid Masters 2024 | |
| 3 | 16y 299d | Monte Carlo Masters 2003 | |
| 4 | 16y 314d | Monte Carlo Masters 2003 | |
| 5 | 16y 342d | Hamburg Masters 2003 | |
| 6 | 17y 9d | Monte Carlo Masters 1991 | |
| 7 | 17y 105d | Madrid Masters 2023 | |
| 8 | 17y 134d | Monte Carlo Masters 1990 | |
| 9 | 17y 148d | Hamburg Masters 1990 | |
| 10 | 17y 171d | Monte Carlo Masters 2010 | |
| 11 | 17y 244d | Madrid Masters 2024 | |
| 12 | 17y 250d | Monte Carlo Masters 2018 | |
| 13 | 17y 253d | Monte Carlo Masters 1999 | |
| 14 | 17y 269d | Rome Masters 2019 | |
| 15 | 17y 348d | Monte Carlo Masters 2021 | |
| 16 | 17y 361d | Madrid Masters 2021 | |
| 17 | 18y 22d | Madrid Masters 2025 | |
| 18 | 18y 23d | Hamburg Masters 1992 | |
| 19 | 18y 30d | Rome Masters 1992 | |
| 20 | 18y 36d | Rome Masters 2025 |
