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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | 15y 227d | Indian Wells Masters 2005 | |
| 2 | 15y 241d | Miami Masters 2005 | |
| 3 | 16y 172d | Miami Masters 2024 | |
| 4 | 16y 226d | Indian Wells Masters 2006 | |
| 5 | 16y 239d | Miami Masters 2006 | |
| 6 | 16y 264d | Miami Masters 2009 | |
| 7 | 16y 272d | Miami Masters 2003 | |
| 8 | 16y 306d | Canada Masters 2005 | |
| 9 | 17y 12d | Indian Wells Masters 1998 | |
| 10 | 17y 13d | Miami Masters 2026 |
