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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | 7y 273d | Berkeley 1968 | |
| 2 | 10y 294d | Johannesburg-2 1976 | |
| 3 | 14y 152d | San Juan 1969 | |
| 4 | 15y 137d | Los Angeles-2 1968 | |
| 5 | 15y 141d | Bloemfontein 1968 | |
| 6 | 15y 145d | Stockholm WCT 1971 | |
| 7 | 15y 151d | San Juan 1970 | |
| 8 | 15y 191d | US Open 1987 | |
| 9 | 15y 230d | Montreal 1989 | |
| 10 | 15y 301d | La Quinta 1986 | |
| 11 | 15y 358d | Memphis 1988 | |
| 12 | 15y 360d | Indianapolis 2005 | |
| 13 | 16y 6d | Indian Wells 1988 | |
| 14 | 16y 9d | US Open 1980 | |
| 15 | 16y 28d | US Open 1983 | |
| 16 | 16y 32d | Johannesburg-1 1968 | |
| 17 | 16y 44d | Stockholm 1979 | |
| 18 | 16y 51d | Indianapolis 1989 | |
| 19 | 16y 58d | Montreal 1989 | |
| 20 | 16y 89d | Australian Open 2009 |
