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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | -26y 313d | Dublin 1968 | |
| 2 | -14y 113d | Manchester 1968 | |
| 3 | 0y 23d | Sydney-2 1975 | |
| 4 | 0y 211d | US Open 1969 | |
| 5 | 7y 312d | Auckland 1971 | |
| 6 | 9y 101d | Australian Open 1972 | |
| 7 | 10y 101d | Australian Open 1973 | |
| 8 | 11y 101d | Australian Open 1974 | |
| 9 | 14y 201d | Brisbane 1970 | |
| 10 | 15y 51d | Queen's Club 1970 | |
| 11 | 15y 157d | Newport 2013 | |
| 12 | 15y 220d | Manchester 1969 | |
| 13 | 15y 223d | Adelaide 1981 | |
| 14 | 15y 227d | Beckenham 1969 | |
| 15 | 15y 234d | Queen's Club 1969 | |
| 16 | 15y 248d | US Open 1972 | |
| 17 | 15y 357d | Queen's Club 2002 | |
| 18 | 16y 5d | Beckenham 1972 | |
| 19 | 16y 13d | Eastbourne 1972 | |
| 20 | 16y 47d | Brisbane 1970 |
