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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | 16y 314d | Adelaide 1998 | |
| 2 | 17y 288d | Genova 1992 | |
| 3 | 18y 14d | Bordeaux 1992 | |
| 4 | 18y 43d | Delray Beach 2008 | |
| 5 | 18y 67d | Delray Beach 1999 | |
| 6 | 18y 67d | Sopot 2004 | |
| 7 | 18y 75d | Umag 2021 | |
| 8 | 18y 173d | Buenos Aires 2025 | |
| 9 | 18y 210d | Estoril 1993 | |
| 10 | 18y 213d | Bolzano 1992 | |
| 11 | 18y 236d | Atlanta 2001 | |
| 12 | 18y 243d | Houston 2001 | |
| 13 | 18y 256d | Costa do Sauipe 2005 | |
| 14 | 18y 274d | San Jose 2006 | |
| 15 | 18y 310d | Manchester 1990 | |
| 16 | 18y 312d | Adelaide 2000 | |
| 17 | 18y 319d | Sydney 2000 | |
| 18 | 18y 334d | Sopot 2005 | |
| 19 | 18y 343d | Lyon 2023 | |
| 20 | 18y 348d | Washington 2001 |
