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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | 15y 45d | Buenos Aires 1985 | |
| 2 | 15y 71d | Boca Raton 1975 | |
| 3 | 15y 110d | Mexico City 1969 | |
| 4 | 15y 308d | Madrid 1972 | |
| 5 | 15y 326d | Bastad 1980 | |
| 6 | 15y 342d | Boca Raton 1975 | |
| 7 | 16y 33d | Bastad 1972 | |
| 8 | 16y 70d | Forest Hills 1988 | |
| 9 | 16y 78d | Buenos Aires-2 1968 | |
| 10 | 16y 124d | Florence 1984 |
