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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | 17y 4d | Beckenham 1973 | |
| 2 | 17y 48d | Auckland 1977 | |
| 3 | 17y 179d | Perth 1969 | |
| 4 | 17y 200d | Queen's Club 1985 | |
| 5 | 17y 206d | Adelaide-2 1982 | |
| 6 | 17y 214d | Auckland 1974 | |
| 7 | 17y 214d | Wimbledon 1985 | |
| 8 | 17y 214d | Melbourne-2 1982 | |
| 9 | 17y 256d | Haverford 1974 | |
| 10 | 18y 93d | Manchester 1969 | |
| 11 | 18y 102d | Queen's Club 1999 | |
| 12 | 18y 124d | Wimbledon 1977 | |
| 13 | 18y 150d | Brisbane 1969 | |
| 14 | 18y 178d | Adelaide 1974 | |
| 15 | 18y 180d | Beckenham 1972 | |
| 16 | 18y 198d | Sydney-2 1983 | |
| 17 | 18y 213d | Wimbledon 1986 | |
| 18 | 18y 214d | Beckenham 1973 | |
| 19 | 18y 285d | Wimbledon 1990 | |
| 20 | 18y 287d | Halle 1993 |
