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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | 16y 216d | San Francisco 1988 | |
| 2 | 17y 85d | Bangkok 1981 | |
| 3 | 17y 197d | Brussels 1982 | |
| 4 | 17y 253d | London WCT 1974 | |
| 5 | 17y 258d | Wembley 1989 | |
| 6 | 17y 263d | Barcelona WCT 1974 | |
| 7 | 17y 277d | Sao Paulo WCT 1974 | |
| 8 | 17y 335d | WCT Finals 1974 | |
| 9 | 17y 354d | Wembley 1985 | |
| 10 | 18y 25d | Birmingham 1975 | |
| 11 | 18y 53d | Masters 1985 | |
| 12 | 18y 59d | Milan 1984 | |
| 13 | 18y 122d | Chicago 1986 | |
| 14 | 18y 128d | Brisbane 1983 | |
| 15 | 18y 136d | WCT Finals 1986 | |
| 16 | 18y 144d | World Invitational Tennis Classic 1974 | |
| 17 | 18y 191d | Philadelphia 1990 | |
| 18 | 18y 192d | Calcutta 1978 | |
| 19 | 18y 213d | Bolzano 1992 | |
| 20 | 18y 234d | Richmond WCT 1975 |
