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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| Vesa Jaaskelainen | 1984-1984 | .000 | 0 | 0 | 0 | 0 | 0 | 2.25 | 3 |
| Henock Jabari | 1961-1981 | .241 | 2 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Wafeeq Jabir | 1964-1964 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Yowen Jabulani | 1977-1977 | .000 | 0 | 0 | 0 | 0 | 0 | 45.00 | 2 |
| Howard Jackson | 1961-1961 | .329 | 2 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Mitchell Jackson | 1970-1970 | .500 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Denzel Jacques | 1973-1988 | .000 | 0 | 0 | 7 | 2 | 0 | 2.58 | 55 |
| Alix Jacquin | 1973-1981 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Pierre Jacquot | 1981-1981 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Spartak Jafaev | 1970-1970 | .000 | 0 | 0 | 0 | 0 | 0 | 2.70 | 2 |
| Areda Jahina | 1973-1973 | .143 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Mufid Jalal | 1977-1977 | .231 | 4 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Tomi Jalkanen | 1958-1970 | .196 | 2 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Fatin Jameel | 1981-1981 | .269 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Travis James | 1988-1988 | .500 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Alexander Jancker | 1977-1977 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Vsevolod Janov | 1961-1967 | .217 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Halewijn Jansen | 1973-1973 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Domingo Jáquez | 1977-1977 | .000 | 0 | 0 | 0 | 0 | 0 | 7.94 | 6 |
| António Jaramillo | 1961-1973 | .127 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| José Jaramillo | 1967-1970 | .000 | 0 | 0 | 1 | 0 | 0 | 12.12 | 7 |
| Will Jardine | 1984-1984 | .000 | 0 | 0 | 0 | 1 | 1 | 4.11 | 16 |
| Vasily Jarovtsev | 1967-1977 | .381 | 6 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| George Jarrom | 1970-1970 | .255 | 0 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Antti-Jussi Jarvela | 1970-1984 | .335 | 4 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Nyyrikki Jarvela | 1988-1988 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jammu Jarvilehto | 1984-1988 | .000 | 0 | 0 | 1 | 1 | 1 | 2.13 | 25 |
| Gabriel Jarvis | 1958-1964 | .292 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Basel Jauhar | 1973-1973 | .000 | 0 | 0 | 2 | 0 | 0 | 4.76 | 22 |
| Abdul-Rahman Jawad | 1988-1988 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Karim Jean | 1970-1973 | .333 | 2 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Abu Jelani | 1964-1973 | .297 | 7 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Nguna Jemadari | 1988-1988 | .000 | 0 | 0 | 0 | 0 | 0 | 15.83 | 3 |
| Kyle Jenkins | 1977-1981 | .361 | 3 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Yidir Jepleting | 1988-1988 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Albert Jerram | 1970-1970 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Dale Jewell | 1988-1988 | .250 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Huai-yu Jianbua | 1984-1984 | .000 | 0 | 0 | 2 | 2 | 0 | 5.40 | 22 |
| Ingidayehu Jibade | 1988-1988 | .000 | 0 | 0 | 0 | 0 | 0 | 5.40 | 0 |
| Habib Jibril | 1973-1981 | .227 | 1 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Gamali Jihad | 1973-1973 | .049 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Esteban Jiménez | 1958-1958 | .182 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| José Antonio Jiménez | 1988-1988 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Mauro Jiménez | 1961-1961 | .000 | 0 | 0 | 0 | 0 | 0 | 13.50 | 2 |
| Raúl Jiménez | 1970-1973 | .000 | 0 | 0 | 10 | 1 | 0 | 1.51 | 89 |
| Sergio Jiménez | 1970-1970 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Immel Jitu | 1984-1988 | .173 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Imbart Jobse | 1958-1961 | .000 | 0 | 0 | 0 | 3 | 0 | 6.00 | 11 |
| Eisse Jochems | 1958-1958 | .000 | 0 | 0 | 0 | 0 | 0 | 12.00 | 5 |
| Austin Johnson | 1964-1964 | .385 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Michael Johnson | 1970-1970 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Vincent Johnson | 1970-1981 | .359 | 23 | 84 | 0 | 0 | 0 | 0.00 | 0 |
| Henry Johnston | 1977-1981 | .263 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Rod Johnston | 1964-1977 | .000 | 0 | 0 | 5 | 1 | 1 | 3.99 | 31 |
| Azmera Jojo | 1961-1970 | .187 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Philippe Joly | 1988-1988 | 1.000 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Daniel Jones | 1970-1973 | .042 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Geer Jones | 1988-1988 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Paul Jones | 1973-1984 | .328 | 8 | 57 | 0 | 0 | 0 | 0.00 | 0 |
| R.J. Jones | 1964-1964 | .364 | 2 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Spencer Jones | 1958-1958 | .333 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Qian Joo | 1970-1973 | .300 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| John Jordan | 1961-1961 | .432 | 5 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Martin Jordan | 1970-1977 | .306 | 2 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Ichiro Jouda | 1988-1988 | .232 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Juárez | 1958-1970 | .333 | 4 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Mariano Juárez | 1984-1988 | .000 | 0 | 0 | 2 | 1 | 0 | 6.85 | 26 |
| Shihab Jubair | 1988-1988 | .217 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Brandon Jubb | 1958-1958 | .311 | 3 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Frazer Jukes | 1964-1964 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Mauro Júlio | 1988-1988 | .193 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Uqessun Jumba | 1970-1988 | .000 | 0 | 0 | 5 | 3 | 0 | 3.45 | 31 |
| Kien-lung Jung | 1967-1967 | .156 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
