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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Vesa Jaaskelainen | 1984-1984 | 0 | 0 | .000 | 2.25 | 4 | 0 | 0 | 0 | 0 | 4.0 | 3 | 1 | 0 | 2 | 3 |
| Yowen Jabulani | 1977-1977 | 0 | 0 | .000 | 45.00 | 2 | 0 | 0 | 0 | 0 | 2.0 | 8 | 10 | 0 | 7 | 2 |
| Denzel Jacques | 1973-1988 | 7 | 2 | .778 | 2.58 | 27 | 4 | 0 | 0 | 0 | 59.1 | 58 | 17 | 2 | 24 | 55 |
| Spartak Jafaev | 1970-1970 | 0 | 0 | .000 | 2.70 | 6 | 0 | 0 | 0 | 0 | 6.2 | 8 | 2 | 0 | 4 | 2 |
| Domingo Jáquez | 1977-1977 | 0 | 0 | .000 | 7.94 | 6 | 0 | 0 | 0 | 0 | 11.1 | 15 | 10 | 3 | 7 | 6 |
| José Jaramillo | 1967-1970 | 1 | 0 | 1.000 | 12.12 | 9 | 0 | 0 | 0 | 0 | 16.1 | 35 | 22 | 3 | 17 | 7 |
| Will Jardine | 1984-1984 | 0 | 1 | .000 | 4.11 | 7 | 0 | 0 | 0 | 1 | 15.1 | 11 | 7 | 3 | 3 | 16 |
| Jammu Jarvilehto | 1984-1988 | 1 | 1 | .500 | 2.13 | 13 | 0 | 0 | 0 | 1 | 25.1 | 19 | 6 | 3 | 4 | 25 |
| Basel Jauhar | 1973-1973 | 2 | 0 | 1.000 | 4.76 | 4 | 3 | 0 | 0 | 0 | 17.0 | 20 | 9 | 1 | 12 | 22 |
| Nguna Jemadari | 1988-1988 | 0 | 0 | .000 | 15.83 | 6 | 0 | 0 | 0 | 0 | 9.2 | 21 | 17 | 3 | 14 | 3 |
| Huai-yu Jianbua | 1984-1984 | 2 | 2 | .500 | 5.40 | 5 | 3 | 0 | 0 | 0 | 23.1 | 26 | 14 | 4 | 6 | 22 |
| Ingidayehu Jibade | 1988-1988 | 0 | 0 | .000 | 5.40 | 1 | 0 | 0 | 0 | 0 | 1.2 | 2 | 1 | 0 | 2 | 0 |
| Mauro Jiménez | 1961-1961 | 0 | 0 | .000 | 13.50 | 3 | 0 | 0 | 0 | 0 | 8.2 | 14 | 13 | 2 | 12 | 2 |
| Raúl Jiménez | 1970-1973 | 10 | 1 | .909 | 1.51 | 14 | 14 | 1 | 0 | 0 | 89.2 | 60 | 15 | 3 | 9 | 89 |
| Imbart Jobse | 1958-1961 | 0 | 3 | .000 | 6.00 | 6 | 3 | 0 | 0 | 0 | 18.0 | 14 | 12 | 2 | 15 | 11 |
| Eisse Jochems | 1958-1958 | 0 | 0 | .000 | 12.00 | 3 | 0 | 0 | 0 | 0 | 6.0 | 10 | 8 | 4 | 4 | 5 |
| Rod Johnston | 1964-1977 | 5 | 1 | .833 | 3.99 | 16 | 0 | 0 | 0 | 1 | 29.1 | 32 | 13 | 2 | 13 | 31 |
| Mariano Juárez | 1984-1988 | 2 | 1 | .667 | 6.85 | 15 | 0 | 0 | 0 | 0 | 22.1 | 24 | 17 | 0 | 22 | 26 |
| Frazer Jukes | 1964-1964 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.2 | 0 | 0 | 0 | 2 | 0 |
| Uqessun Jumba | 1970-1988 | 5 | 3 | .625 | 3.45 | 14 | 8 | 1 | 0 | 0 | 62.2 | 55 | 24 | 4 | 23 | 31 |
