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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 |
|---|---|---|---|---|---|---|---|---|---|
| Arseny Jachikov | 1921-1923 | .343 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Giovanny Jaconelli | 1921-1925 | .320 | 0 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Jacques | 1921-1925 | .277 | 2 | 78 | 0 | 0 | 0 | 0.00 | 0 |
| Francis Jacquot | 1923-1925 | .111 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Yura Jafarov | 1922-1922 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Mikael Jalkanen | 1921-1925 | .264 | 0 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Janusz Janicki | 1921-1921 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Wyszemir Janik | 1921-1925 | .309 | 0 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Teodor Jankiewicz | 1923-1925 | .307 | 1 | 100 | 0 | 0 | 0 | 0.00 | 0 |
| Lubor Janousek | 1925-1925 | .267 | 0 | 5 | 9 | 4 | 0 | 4.41 | 7 |
| Jurg Janssen | 1926-1926 | .109 | 0 | 2 | 10 | 19 | 1 | 3.14 | 146 |
| Tolenka Jarnikov | 1921-1921 | .250 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Markus Jarvi | 1926-1926 | .265 | 2 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Albin Jaskula | 1926-1926 | .143 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Fabi Jatzuba | 1921-1921 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Niegloslaw Jaworski | 1921-1924 | .400 | 0 | 1 | 2 | 0 | 4 | 4.09 | 2 |
| Michel Jean | 1926-1926 | .165 | 1 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Joël Jeannin | 1923-1923 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Lukás Jedelsky | 1921-1925 | .286 | 0 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Micah Jenkins | 1922-1924 | .312 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Charles Jennings | 1921-1926 | .200 | 0 | 0 | 2 | 6 | 11 | 4.66 | 7 |
| Helge Jensen | 1921-1921 | .250 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Scott Jensen | 1925-1926 | .096 | 0 | 1 | 21 | 21 | 0 | 2.78 | 167 |
| Mikkel Jepsen | 1921-1925 | .248 | 0 | 42 | 67 | 83 | 2 | 4.99 | 109 |
| Mark Jivotov | 1921-1926 | .091 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Nicolai Jiznevsky | 1922-1925 | .263 | 0 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Gair Johns | 1921-1925 | .214 | 0 | 3 | 14 | 16 | 0 | 5.51 | 30 |
| Owen Johnson | 1921-1926 | .162 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Charlie Jones | 1921-1925 | .339 | 5 | 480 | 0 | 0 | 0 | 0.00 | 0 |
| Tynen Jones | 1921-1926 | .248 | 3 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Ben Joppe | 1921-1925 | .174 | 0 | 10 | 13 | 13 | 0 | 4.74 | 15 |
| Sheedy Jordan | 1926-1926 | .048 | 0 | 2 | 15 | 18 | 3 | 2.64 | 98 |
| Trym Jorgensen | 1921-1926 | .158 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Lenny Joseph | 1924-1925 | .276 | 1 | 108 | 0 | 0 | 0 | 0.00 | 0 |
| Samuel Jourdain | 1921-1921 | .571 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| César Jourdan | 1921-1922 | .000 | 0 | 0 | 0 | 2 | 2 | 2.70 | 2 |
| Zivota Jovanovic | 1926-1926 | .200 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Djodja Jovovich | 1922-1925 | .322 | 4 | 200 | 0 | 0 | 0 | 0.00 | 0 |
| Ratko Jovovich | 1921-1921 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jake Joyce | 1921-1925 | .357 | 2 | 159 | 0 | 0 | 0 | 0.00 | 0 |
| Iwo Jozwiak | 1921-1926 | .331 | 3 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Fryderyk Jozwik | 1926-1926 | .250 | 1 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Vitaly Jukhman | 1926-1926 | .417 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Feliks Jukhtanov | 1921-1925 | .311 | 0 | 5 | 10 | 4 | 1 | 2.97 | 13 |
| Mikolas Juklicek | 1926-1926 | .000 | 0 | 0 | 0 | 0 | 0 | 11.25 | 1 |
| Mandel Junker | 1926-1926 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jenda Jurcek | 1921-1925 | .303 | 0 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Maczysz Jurczynski | 1921-1926 | .269 | 4 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Into Jutila | 1926-1926 | .258 | 1 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Ambjorn Jössi | 1921-1925 | .291 | 0 | 15 | 0 | 0 | 0 | 0.00 | 0 |
