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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 |
|---|---|---|---|---|---|---|---|---|---|
| Dave Jackson | 2034-2037 | .200 | 0 | 0 | 10 | 10 | 3 | 4.60 | 75 |
| Dennis Jackson | 2032-2035 | .053 | 0 | 0 | 12 | 5 | 0 | 3.10 | 140 |
| 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 | 2039-2040 | .000 | 0 | 0 | 1 | 2 | 25 | 0.98 | 34 |
| Jack Jacoby | 2037-2040 | .000 | 0 | 0 | 10 | 4 | 2 | 2.66 | 76 |
| Mark Jago | 2038-2040 | .000 | 0 | 0 | 4 | 2 | 0 | 5.40 | 39 |
| Mickael Jamet | 2040-2040 | .000 | 0 | 0 | 0 | 1 | 0 | 3.60 | 23 |
| 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 |
| Baio Jen | 2040-2040 | .121 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Eric Jenkins | 2040-2040 | .000 | 0 | 0 | 0 | 1 | 1 | 7.20 | 6 |
| John Jenkins | 2026-2029 | .000 | 0 | 0 | 7 | 10 | 0 | 2.70 | 143 |
| José Jiménez | 2039-2040 | .000 | 0 | 0 | 3 | 4 | 0 | 2.74 | 30 |
| Pedro Jiménez | 2040-2040 | .000 | 0 | 0 | 2 | 4 | 0 | 3.75 | 27 |
| Yi Jiu | 2039-2040 | .216 | 5 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Art Johnson | 2039-2040 | .260 | 8 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Rory Johnstone | 2035-2038 | .217 | 8 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Justin Jolliffe | 2038-2040 | .000 | 0 | 0 | 4 | 3 | 2 | 2.85 | 35 |
| Yves Joly | 2039-2040 | .200 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Bryan Jones | 2036-2039 | .269 | 21 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Clive Jones | 2035-2038 | .206 | 21 | 67 | 0 | 0 | 0 | 0.00 | 0 |
| Ken Jones | 2034-2034 | .100 | 3 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Stan Jones | 2039-2040 | .000 | 0 | 0 | 5 | 5 | 0 | 2.21 | 52 |
| Ernie Jordan | 2034-2037 | .239 | 40 | 122 | 0 | 0 | 0 | 0.00 | 0 |
| Darrel Josey | 2040-2040 | .000 | 0 | 0 | 3 | 1 | 0 | 0.59 | 17 |
| 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 | 2038-2040 | .308 | 17 | 72 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Hsi-men Ju | 2039-2040 | .286 | 8 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Li-zhi Jung | 2037-2040 | .255 | 9 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| 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 |
