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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 |
|---|---|---|---|---|---|---|---|---|---|
| John Jackson | 2037-2037 | .266 | 1 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Ryung Jae-Wook | 2032-2032 | .306 | 5 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Joe James | 2032-2032 | .444 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Kenny James | 2033-2035 | .154 | 0 | 1 | 10 | 8 | 4 | 4.19 | 142 |
| Jay Jamieson | 2032-2032 | .242 | 0 | 11 | 0 | 0 | 0 | 18.00 | 1 |
| Cornelio Japón | 2032-2032 | .317 | 1 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Japón | 2035-2035 | .261 | 4 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Alberto Jaramillo | 2035-2035 | .000 | 0 | 0 | 10 | 7 | 0 | 4.47 | 134 |
| Neill Jasperse | 2034-2034 | .000 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Mauro Jasso | 2036-2036 | .282 | 18 | 63 | 0 | 0 | 0 | 0.00 | 0 |
| Adam Jensson | 2032-2032 | .261 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Tak-wai Jia | 2032-2036 | .276 | 2 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Dong-hua Jianbua | 2032-2034 | .297 | 13 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Ger Jobse | 2036-2036 | .253 | 4 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Gerald Johnston | 2036-2036 | .230 | 1 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| George Johnstone | 2032-2033 | .000 | 0 | 0 | 4 | 13 | 0 | 4.40 | 107 |
| Mike Johnstone | 2037-2037 | .249 | 3 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Jorgen Jorgenson | 2036-2037 | .301 | 1 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Manu Jortikka | 2036-2037 | .000 | 0 | 0 | 8 | 8 | 0 | 2.45 | 205 |
| Daniel Joseph | 2035-2035 | .285 | 6 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Jovellanos | 2034-2035 | .000 | 0 | 0 | 0 | 6 | 0 | 4.22 | 56 |
| Manny Juárez | 2032-2033 | .000 | 0 | 0 | 6 | 3 | 0 | 3.51 | 89 |
