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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | 18y 310d | Manchester 1990 | |
| 2 | 18y 360d | Nottingham 2005 | |
| 3 | 19y 108d | Queen's Club 2000 | |
| 4 | 19y 277d | Manchester 1991 | |
| 5 | 19y 302d | Newport 1993 | |
| 6 | 20y 1d | Nottingham 2006 | |
| 7 | 20y 107d | Queen's Club 2001 | |
| 8 | 20y 113d | 's-Hertogenbosch 2001 | |
| 9 | 20y 214d | Queen's Club 1997 | |
| 10 | 20y 266d | Queen's Club 1992 | |
| 11 | 20y 272d | Newport 2003 | |
| 12 | 20y 283d | Queen's Club 2003 | |
| 13 | 21y 74d | Newport 2002 | |
| 14 | 21y 74d | 's-Hertogenbosch 2005 | |
| 15 | 21y 99d | Rosmalen 1995 | |
| 16 | 21y 105d | Queen's Club 2002 | |
| 17 | 21y 166d | Manchester 1994 | |
| 18 | 21y 238d | Eastbourne 2019 | |
| 19 | 21y 266d | Halle 2007 | |
| 20 | 21y 281d | Queen's Club 2004 |
