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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | 18y 102d | Queen's Club 1999 | |
| 2 | 18y 287d | Halle 1993 | |
| 3 | 18y 292d | Nottingham 2001 | |
| 4 | 18y 305d | Stuttgart 2019 | |
| 5 | 18y 310d | Manchester 1990 | |
| 6 | 18y 325d | Newport 2023 | |
| 7 | 18y 360d | Nottingham 2005 | |
| 8 | 19y 48d | 's-Hertogenbosch 2001 | |
| 9 | 19y 56d | Newport 2006 | |
| 10 | 19y 108d | Queen's Club 2000 |
