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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | 16y 314d | Monte Carlo Masters 2003 | |
| 2 | 16y 342d | Hamburg Masters 2003 | |
| 3 | 17y 292d | Miami Masters 2004 | |
| 4 | 18y 84d | Indian Wells Masters 1991 | |
| 5 | 18y 114d | Canada Masters 2017 | |
| 6 | 18y 151d | Canada Masters 1990 | |
| 7 | 18y 154d | Rome Masters 1991 | |
| 8 | 18y 162d | Paris Masters 2005 | |
| 9 | 18y 165d | Cincinnati Masters 1990 | |
| 10 | 18y 173d | Indian Wells Masters 1990 |
