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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 | 18y 178d | Adelaide 1974 | |
| 5 | 19y 25d | Sydney-2 1978 | |
| 6 | 19y 198d | Queen's Club 1987 | |
| 7 | 19y 290d | Queen's Club 1972 | |
| 8 | 19y 305d | New Delhi 1973 | |
| 9 | 19y 340d | Bristol 1988 | |
| 10 | 19y 357d | Haverford 1974 | |
| 11 | 20y 115d | Queen's Club 1979 | |
| 12 | 20y 177d | Beckenham 1974 | |
| 13 | 20y 196d | Queen's Club 1988 | |
| 14 | 20y 201d | Melbourne-2 1985 | |
| 15 | 20y 284d | Sydney-2 1980 | |
| 16 | 20y 295d | Sydney-2 1983 | |
| 17 | 20y 330d | Sydney 1971 | |
| 18 | 21y 113d | Queen's Club 1980 | |
| 19 | 21y 215d | Brisbane 1970 | |
| 20 | 21y 232d | Brisbane 1980 |
