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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | 17y 200d | Queen's Club 1985 | |
| 2 | 17y 214d | Auckland 1974 | |
| 3 | 17y 214d | Melbourne-2 1982 | |
| 4 | 17y 214d | Wimbledon 1985 | |
| 5 | 18y 178d | Adelaide 1974 | |
| 6 | 18y 213d | Wimbledon 1986 | |
| 7 | 18y 310d | Manchester 1990 | |
| 8 | 18y 360d | Nottingham 2005 | |
| 9 | 19y 25d | Sydney-2 1978 | |
| 10 | 19y 98d | Australian Open 1983 | |
| 11 | 19y 108d | Queen's Club 2000 | |
| 12 | 19y 198d | Queen's Club 1987 | |
| 13 | 19y 277d | Manchester 1991 | |
| 14 | 19y 290d | Queen's Club 1972 | |
| 15 | 19y 302d | Newport 1993 | |
| 16 | 19y 305d | New Delhi 1973 | |
| 17 | 19y 310d | Australian Open 1985 | |
| 18 | 19y 340d | Bristol 1988 | |
| 19 | 19y 357d | Haverford 1974 | |
| 20 | 20y 1d | Nottingham 2006 |
