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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | -26y 313d | Dublin 1968 | |
| 2 | 14y 201d | Brisbane 1970 | |
| 3 | 15y 227d | Beckenham 1969 | |
| 4 | 16y 50d | Queen's Club 1971 | |
| 5 | 16y 62d | Melbourne-2 1985 | |
| 6 | 16y 78d | Australian Championships 1968 | |
| 7 | 16y 131d | Brisbane 1981 | |
| 8 | 16y 222d | Adelaide 1982 | |
| 9 | 16y 253d | Newport-1 1970 | |
| 10 | 16y 296d | Sydney-1 1987 | |
| 11 | 17y 4d | Australian Open 1984 | |
| 12 | 17y 4d | Beckenham 1973 | |
| 13 | 17y 18d | Wimbledon 1973 | |
| 14 | 17y 48d | Auckland 1977 | |
| 15 | 17y 59d | Hobart 1969 | |
| 16 | 17y 74d | Brisbane 1971 | |
| 17 | 17y 83d | US Open 1973 | |
| 18 | 17y 124d | Wimbledon 1989 | |
| 19 | 17y 131d | Newport 1998 | |
| 20 | 17y 142d | Adelaide 1968 |
