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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | 16y 261d | Prague 1996 | |
| 2 | 16y 314d | Adelaide 1998 | |
| 3 | 17y 8d | Geneva 1991 | |
| 4 | 17y 33d | Bastad 2003 | |
| 5 | 17y 47d | Umag 2003 | |
| 6 | 17y 50d | Toulouse 1998 | |
| 7 | 17y 127d | Nice 1990 | |
| 8 | 17y 145d | Moscow 2013 | |
| 9 | 17y 152d | Prague 1995 | |
| 10 | 17y 176d | Marseille 1999 | |
| 11 | 17y 205d | Indianapolis 2007 | |
| 12 | 17y 222d | Auckland 2004 | |
| 13 | 17y 237d | Bucharest 2024 | |
| 14 | 17y 239d | Munich 1992 | |
| 15 | 17y 242d | Buenos Aires 2004 | |
| 16 | 17y 248d | Umag 2014 | |
| 17 | 17y 250d | St. Petersburg 1995 | |
| 18 | 17y 251d | Stuttgart 2025 | |
| 19 | 17y 252d | Prague 1996 | |
| 20 | 17y 274d | Bordeaux 1990 |
