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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | 19y 15d | US Open 1990 | |
| 2 | 19y 116d | US Open 2022 | |
| 3 | 20y 184d | US Open 2001 | |
| 4 | 20y 192d | US Open 1979 | |
| 5 | 20y 214d | US Open 2000 | |
| 6 | 20y 237d | Australian Open 2008 | |
| 7 | 20y 341d | US Open 2009 | |
| 8 | 20y 360d | US Open 2003 | |
| 9 | 21y 148d | Australian Open 1992 | |
| 10 | 21y 191d | US Open 1980 | |
| 11 | 21y 279d | US Open 1989 | |
| 12 | 22y 18d | US Open 1993 | |
| 13 | 22y 111d | US Open 2025 | |
| 14 | 22y 151d | Australian Open 2024 | |
| 15 | 22y 154d | Australian Open 1993 | |
| 16 | 22y 158d | Australian Open 1994 | |
| 17 | 22y 163d | Australian Open 2004 | |
| 18 | 22y 197d | US Open 1981 | |
| 19 | 22y 230d | Australian Open 2009 | |
| 20 | 23y 10d | US Open 2024 |
