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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | 16y 284d | Rome 1984 | |
| 2 | 16y 292d | Naples 1968 | |
| 3 | 16y 295d | St. Vincent 1986 | |
| 4 | 16y 303d | Buenos Aires 1986 | |
| 5 | 16y 314d | Monte-Carlo 1973 | |
| 6 | 16y 349d | Boston 1984 | |
| 7 | 16y 356d | Washington 1984 | |
| 8 | 17y 8d | Geneva 1991 | |
| 9 | 17y 20d | Buenos Aires 1986 | |
| 10 | 17y 32d | Bastad 1973 | |
| 11 | 17y 39d | Venice 1982 | |
| 12 | 17y 46d | Geneva 1984 | |
| 13 | 17y 47d | Umag 2003 | |
| 14 | 17y 68d | Forest Hills 1989 | |
| 15 | 17y 84d | Hamburg 2014 | |
| 16 | 17y 88d | Bournemouth 1983 | |
| 17 | 17y 96d | Roland Garros 1989 | |
| 18 | 17y 123d | Barcelona-2 1973 | |
| 19 | 17y 137d | Palermo 1982 | |
| 20 | 17y 165d | Buenos Aires 1973 |
