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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 |
|---|---|---|---|---|---|---|---|---|---|
| Graham Jackson | 2035-2038 | .227 | 6 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Menno Jacobse | 2037-2040 | .252 | 19 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Cade Jacobson | 2039-2042 | .000 | 0 | 0 | 3 | 4 | 33 | 2.28 | 59 |
| Jack Jacoby | 2037-2040 | .000 | 0 | 0 | 10 | 4 | 2 | 2.66 | 76 |
| Heintz Jager | 2041-2042 | .000 | 0 | 0 | 4 | 1 | 1 | 2.67 | 43 |
| Mark Jago | 2038-2041 | .000 | 0 | 0 | 8 | 2 | 0 | 4.11 | 52 |
| Mickael Jamet | 2040-2042 | .000 | 0 | 0 | 2 | 6 | 1 | 4.25 | 63 |
| Declan Jamieson | 2031-2034 | .067 | 0 | 0 | 11 | 14 | 0 | 2.69 | 219 |
| Taylor Jarrett | 2033-2036 | .100 | 0 | 0 | 9 | 13 | 0 | 3.15 | 191 |
| Oscar Jarrold | 2030-2032 | .000 | 0 | 0 | 9 | 9 | 0 | 2.86 | 121 |
| Jules Jarville | 2042-2042 | .111 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Baio Jen | 2040-2042 | .142 | 9 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Eric Jenkins | 2040-2042 | .000 | 0 | 0 | 5 | 2 | 1 | 3.51 | 28 |
| Yi-mou Jia | 2041-2042 | .220 | 3 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Wei-quo Jiao | 2042-2042 | .000 | 0 | 0 | 1 | 1 | 0 | 5.62 | 8 |
| Xi-ku Jiao | 2041-2042 | .207 | 9 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| José Jiménez | 2039-2042 | .000 | 0 | 0 | 6 | 5 | 0 | 2.39 | 56 |
| Pedro Jiménez | 2040-2042 | .000 | 0 | 0 | 5 | 11 | 0 | 3.34 | 60 |
| Yi Jiu | 2039-2042 | .215 | 10 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Andy Johannson | 2041-2042 | .151 | 4 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Art Johnson | 2039-2042 | .283 | 26 | 81 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Johnson | 2041-2042 | .000 | 0 | 0 | 3 | 8 | 0 | 3.19 | 60 |
| Phil Joiner | 2041-2042 | .184 | 1 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Harry Jollymour | 2042-2042 | .000 | 0 | 0 | 0 | 2 | 0 | 2.84 | 5 |
| Yves Joly | 2039-2040 | .200 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Adam Jones | 2042-2042 | .000 | 0 | 0 | 1 | 1 | 12 | 1.27 | 10 |
| Bryan Jones | 2036-2039 | .269 | 21 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Ken Jones | 2034-2034 | .100 | 3 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Stan Jones | 2039-2042 | .000 | 0 | 0 | 9 | 10 | 0 | 2.46 | 117 |
| Huibert Joosten | 2042-2042 | .327 | 6 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Ernie Jordan | 2034-2037 | .239 | 40 | 122 | 0 | 0 | 0 | 0.00 | 0 |
| Ronald Jordan | 2041-2042 | .283 | 7 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Darrel Josey | 2040-2042 | .000 | 0 | 0 | 4 | 4 | 0 | 2.14 | 43 |
| Akinori Jouda | 2034-2037 | .259 | 67 | 139 | 0 | 0 | 0 | 0.00 | 0 |
| Sadanobu Jouda | 2036-2039 | .255 | 13 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Shigochiyo Jouda | 2038-2041 | .294 | 21 | 88 | 0 | 0 | 0 | 0.00 | 0 |
| Yujiro Jouda | 2041-2042 | .000 | 0 | 0 | 6 | 7 | 0 | 3.30 | 68 |
| Natsume Jouon | 2042-2042 | .000 | 0 | 0 | 2 | 3 | 0 | 3.38 | 42 |
| Hsi-men Ju | 2039-2042 | .277 | 12 | 70 | 0 | 0 | 0 | 0.00 | 0 |
| Min Jue | 2041-2042 | .249 | 15 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Li-zhi Jung | 2037-2040 | .255 | 9 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| Fernando Juárez | 2041-2042 | .000 | 0 | 0 | 2 | 0 | 2 | 2.97 | 19 |
| Roberto Juárez | 2030-2031 | .000 | 0 | 0 | 3 | 4 | 6 | 2.16 | 96 |
| José Júlio | 2037-2040 | .000 | 0 | 0 | 3 | 14 | 0 | 3.69 | 94 |
