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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 |
|---|---|---|---|---|---|---|---|---|---|
| Erik Jackson | 2039-2040 | .000 | 0 | 0 | 5 | 4 | 23 | 2.67 | 112 |
| John Jackson | 2037-2038 | .267 | 1 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Ken Jackson | 2041-2041 | .254 | 7 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Ryung Jae-Wook | 2032-2032 | .306 | 5 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Jacob James | 2038-2038 | .185 | 1 | 17 | 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 |
| Reginald James | 2039-2041 | .270 | 2 | 45 | 0 | 0 | 0 | 0.00 | 0 |
| Stan James | 2041-2041 | .148 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jay Jamieson | 2032-2032 | .242 | 0 | 11 | 0 | 0 | 0 | 18.00 | 1 |
| Steef Janse | 2040-2041 | .247 | 2 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| 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 |
| Júlio Japón | 2039-2041 | .000 | 0 | 0 | 14 | 10 | 8 | 4.43 | 226 |
| 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 |
| Brenton Jenkins | 2038-2040 | .000 | 0 | 0 | 2 | 1 | 0 | 3.45 | 34 |
| Adam Jensson | 2032-2032 | .261 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Fred Jerger | 2039-2039 | .000 | 0 | 0 | 6 | 2 | 0 | 3.34 | 50 |
| 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 |
| José Jiménez | 2039-2041 | .000 | 0 | 0 | 23 | 12 | 0 | 2.73 | 283 |
| Ger Jobse | 2036-2036 | .253 | 4 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Byron Joe | 2039-2040 | .000 | 0 | 0 | 9 | 4 | 0 | 4.63 | 96 |
| Eli Johnson | 2041-2041 | .225 | 4 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Paul Johnson | 2041-2041 | .000 | 0 | 0 | 4 | 1 | 3 | 2.16 | 40 |
| Ben Johnston | 2041-2041 | .143 | 0 | 2 | 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 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Mike Johnstone | 2037-2038 | .264 | 8 | 66 | 0 | 0 | 0 | 0.00 | 0 |
| Kimmo-Mikka Jokinen | 2039-2041 | .000 | 0 | 0 | 11 | 11 | 0 | 2.84 | 188 |
| Ralph Jones | 2040-2040 | .000 | 0 | 0 | 0 | 0 | 0 | 5.40 | 7 |
| Sam Jones | 2040-2041 | .260 | 8 | 47 | 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 |
| Emílio Jover | 2040-2041 | .373 | 1 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Ken Joyner | 2038-2038 | .375 | 0 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Rich Joyner | 2041-2041 | .219 | 3 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Jaime Juárez | 2039-2041 | .282 | 14 | 74 | 0 | 0 | 0 | 0.00 | 0 |
| José Juárez | 2041-2041 | .000 | 0 | 0 | 1 | 0 | 0 | 0.71 | 20 |
| Manny Juárez | 2032-2033 | .000 | 0 | 0 | 6 | 3 | 0 | 3.51 | 89 |
| Markus Jutzi | 2039-2039 | .000 | 0 | 0 | 3 | 1 | 0 | 1.88 | 29 |
