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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | 17y 159d | Masters 1984 | |
| 2 | 17y 279d | Masters 1989 | |
| 3 | 18y 53d | Masters 1985 | |
| 4 | 18y 148d | Masters 1982 | |
| 5 | 18y 186d | Masters 1974 | |
| 6 | 18y 215d | Masters 1988 | |
| 7 | 19y 9d | Masters 1986 | |
| 8 | 19y 76d | ATP Tour World Championships 1993 | |
| 9 | 19y 92d | ATP Tour World Championship 1990 | |
| 10 | 19y 140d | Masters 1983 | |
| 11 | 19y 146d | Masters 1983 | |
| 12 | 19y 176d | Masters 1975 | |
| 13 | 19y 213d | Masters 1989 | |
| 14 | 19y 262d | Next Gen ATP Finals 2018 | |
| 15 | 19y 276d | Tennis Masters Cup 2000 | |
| 16 | 19y 328d | Masters 1978 | |
| 17 | 19y 360d | Masters 1985 | |
| 18 | 20y 9d | Masters 1987 | |
| 19 | 20y 47d | Masters Cup 2008 | |
| 20 | 20y 85d | Next Gen ATP Finals 2018 |
