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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | -14y 113d | Manchester 1968 | |
| 2 | -12y 20d | Kitzbuhel 1970 | |
| 3 | -6y 360d | Madrid-1 1975 | |
| 4 | 0y 23d | Sydney-2 1975 | |
| 5 | 3y 198d | Madrid 1979 | |
| 6 | 7y 273d | Berkeley 1968 | |
| 7 | 8y 238d | Barcelona 1968 | |
| 8 | 9y 101d | Australian Open 1972 | |
| 9 | 9y 259d | Washington 1969 | |
| 10 | 10y 101d | Australian Open 1973 |
