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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | -26y 313d | Dublin 1968 | |
| 2 | 7y 312d | Auckland 1971 | |
| 3 | 14y 201d | Brisbane 1970 | |
| 4 | 15y 157d | Newport 2013 | |
| 5 | 15y 223d | Adelaide 1981 | |
| 6 | 15y 227d | Beckenham 1969 | |
| 7 | 16y 13d | Eastbourne 1972 | |
| 8 | 16y 47d | Brisbane 1970 | |
| 9 | 16y 50d | Queen's Club 1971 | |
| 10 | 16y 55d | Adelaide 1985 | |
| 11 | 16y 62d | Melbourne-2 1985 | |
| 12 | 16y 78d | Australian Championships 1968 | |
| 13 | 16y 97d | Sydney-1 1988 | |
| 14 | 16y 112d | Hobart 1969 | |
| 15 | 16y 131d | Brisbane 1981 | |
| 16 | 16y 200d | 's-Hertogenbosch 2009 | |
| 17 | 16y 215d | Brisbane 1969 | |
| 18 | 16y 215d | Wimbledon 1984 | |
| 19 | 16y 219d | Brisbane 1972 | |
| 20 | 16y 222d | Adelaide 1982 |
