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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | 7y 273d | Berkeley 1968 | |
| 2 | 15y 306d | Fort Lauderdale 1971 | |
| 3 | 16y 108d | Cincinnati 1969 | |
| 4 | 16y 146d | Johannesburg 1971 | |
| 5 | 16y 154d | Johannesburg 1969 | |
| 6 | 16y 195d | Johannesburg 1971 | |
| 7 | 16y 253d | Boca Raton 1986 | |
| 8 | 16y 276d | Manchester 1971 | |
| 9 | 16y 276d | Rome 1968 | |
| 10 | 16y 299d | Key Biscayne 1987 |
