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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | -12y 20d | Kitzbuhel 1970 | |
| 2 | -11y 323d | Istanbul 1975 | |
| 3 | 8y 238d | Barcelona 1968 | |
| 4 | 9y 259d | Washington 1969 | |
| 5 | 10y 35d | Vina del Mar 1981 | |
| 6 | 10y 336d | Santiago 1981 | |
| 7 | 12y 176d | Miami 1977 | |
| 8 | 13y 276d | St. Petersburg 1968 | |
| 9 | 14y 90d | Mexico City 1968 | |
| 10 | 14y 165d | Prague 1989 | |
| 11 | 15y 45d | Buenos Aires 1985 | |
| 12 | 15y 71d | Boca Raton 1975 | |
| 13 | 15y 110d | Mexico City 1969 | |
| 14 | 15y 158d | Estoril 2006 | |
| 15 | 15y 170d | Bangalore 1976 | |
| 16 | 15y 259d | Geneva 1983 | |
| 17 | 15y 269d | Houston 2005 | |
| 18 | 15y 301d | Monte Carlo Masters 2002 | |
| 19 | 15y 308d | Madrid 1972 | |
| 20 | 15y 326d | Bastad 1980 |
