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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | 17y 4d | Beckenham 1973 | |
| 2 | 17y 48d | Auckland 1977 | |
| 3 | 17y 200d | Queen's Club 1985 | |
| 4 | 17y 214d | Melbourne-2 1982 | |
| 5 | 17y 214d | Wimbledon 1985 | |
| 6 | 17y 214d | Auckland 1974 | |
| 7 | 18y 178d | Adelaide 1974 | |
| 8 | 18y 180d | Beckenham 1972 | |
| 9 | 18y 213d | Wimbledon 1986 | |
| 10 | 18y 287d | Halle 1993 | |
| 11 | 18y 305d | Stuttgart 2019 | |
| 12 | 18y 310d | Manchester 1990 | |
| 13 | 18y 325d | Newport 2023 | |
| 14 | 18y 360d | Nottingham 2005 | |
| 15 | 19y 8d | Brisbane 1970 | |
| 16 | 19y 25d | Sydney-2 1978 | |
| 17 | 19y 54d | Halle 2016 | |
| 18 | 19y 98d | Australian Open 1983 | |
| 19 | 19y 108d | Queen's Club 2000 | |
| 20 | 19y 123d | Queen's Club 1978 |
