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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | 16y 314d | Adelaide 1998 | |
| 2 | 17y 8d | Geneva 1991 | |
| 3 | 17y 47d | Umag 2003 | |
| 4 | 17y 222d | Auckland 2004 | |
| 5 | 17y 242d | Buenos Aires 2004 | |
| 6 | 17y 284d | Gstaad 2006 | |
| 7 | 17y 288d | Genova 1992 | |
| 8 | 17y 295d | Toulouse 1990 | |
| 9 | 17y 313d | Adelaide 1999 | |
| 10 | 17y 335d | Marbella 2021 | |
| 11 | 18y 4d | Scottsdale 1999 | |
| 12 | 18y 14d | Bordeaux 1992 | |
| 13 | 18y 43d | Delray Beach 2008 | |
| 14 | 18y 46d | Bermuda 1996 | |
| 15 | 18y 53d | St. Petersburg 2006 | |
| 16 | 18y 58d | Antwerp 2019 | |
| 17 | 18y 65d | Belgrade 2010 | |
| 18 | 18y 67d | Delray Beach 1999 | |
| 19 | 18y 67d | Sopot 2004 | |
| 20 | 18y 75d | Umag 2021 |
