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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | 16y 69d | Tel Aviv 1983 | |
| 2 | 17y 39d | Tel Aviv 1984 | |
| 3 | 17y 207d | Itaparica 1987 | |
| 4 | 17y 270d | Cincinnati 1985 | |
| 5 | 17y 291d | Memphis 1988 | |
| 6 | 17y 364d | Napa 1981 | |
| 7 | 18y 39d | Little Rock 1975 | |
| 8 | 18y 79d | Next Gen Finals 2019 | |
| 9 | 18y 87d | Stratton Mountain 1988 | |
| 10 | 18y 108d | Livingston 1988 | |
| 11 | 18y 119d | Next Gen Finals 2024 | |
| 12 | 18y 187d | NextGen Finals 2021 | |
| 13 | 18y 262d | Toronto-2 1986 | |
| 14 | 18y 304d | Nancy 1979 | |
| 15 | 18y 325d | Sydney 1986 | |
| 16 | 18y 357d | Cincinnati 1983 | |
| 17 | 19y 40d | Auckland 1979 | |
| 18 | 19y 47d | Basel 1989 | |
| 19 | 19y 69d | Stockholm 1983 | |
| 20 | 19y 86d | Indian Wells 1987 |
