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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Erik Jackson | 2039-2040 | 5 | 4 | .556 | 2.67 | 51 | 10 | 0 | 0 | 23 | 104.2 | 97 | 31 | 3 | 25 | 112 |
| Kenny James | 2033-2035 | 10 | 8 | .556 | 4.19 | 52 | 15 | 2 | 0 | 4 | 141.2 | 156 | 66 | 8 | 41 | 142 |
| Jay Jamieson | 2032-2032 | 0 | 0 | .000 | 18.00 | 2 | 0 | 0 | 0 | 0 | 2.0 | 8 | 4 | 0 | 1 | 1 |
| Júlio Japón | 2039-2041 | 14 | 10 | .583 | 4.43 | 76 | 5 | 0 | 0 | 8 | 181.0 | 173 | 89 | 17 | 58 | 226 |
| Alberto Jaramillo | 2035-2035 | 10 | 7 | .588 | 4.47 | 24 | 24 | 1 | 1 | 0 | 151.0 | 177 | 75 | 18 | 30 | 134 |
| Brenton Jenkins | 2038-2040 | 2 | 1 | .667 | 3.45 | 5 | 5 | 0 | 0 | 0 | 28.2 | 25 | 11 | 2 | 6 | 34 |
| Fred Jerger | 2039-2039 | 6 | 2 | .750 | 3.34 | 12 | 12 | 0 | 0 | 0 | 64.2 | 63 | 24 | 1 | 22 | 50 |
| José Jiménez | 2039-2041 | 23 | 12 | .657 | 2.73 | 44 | 44 | 1 | 1 | 0 | 270.1 | 255 | 82 | 5 | 90 | 283 |
| Byron Joe | 2039-2040 | 9 | 4 | .692 | 4.63 | 23 | 23 | 1 | 1 | 0 | 118.2 | 137 | 61 | 3 | 28 | 96 |
| Paul Johnson | 2041-2041 | 4 | 1 | .800 | 2.16 | 20 | 0 | 0 | 0 | 3 | 33.1 | 23 | 8 | 2 | 7 | 40 |
| George Johnstone | 2032-2033 | 4 | 13 | .235 | 4.40 | 24 | 24 | 2 | 0 | 0 | 145.1 | 161 | 71 | 8 | 44 | 107 |
| Kimmo-Mikka Jokinen | 2039-2041 | 11 | 11 | .500 | 2.84 | 33 | 33 | 0 | 0 | 0 | 168.0 | 156 | 53 | 10 | 41 | 188 |
| Ralph Jones | 2040-2040 | 0 | 0 | .000 | 5.40 | 2 | 0 | 0 | 0 | 0 | 5.0 | 9 | 3 | 0 | 1 | 7 |
| Manu Jortikka | 2036-2037 | 8 | 8 | .500 | 2.45 | 31 | 31 | 1 | 0 | 0 | 173.0 | 146 | 47 | 5 | 22 | 205 |
| Jose Jovellanos | 2034-2035 | 0 | 6 | .000 | 4.22 | 16 | 14 | 0 | 0 | 0 | 49.0 | 47 | 23 | 6 | 17 | 56 |
| José Juárez | 2041-2041 | 1 | 0 | 1.000 | 0.71 | 8 | 0 | 0 | 0 | 0 | 12.2 | 5 | 1 | 1 | 1 | 20 |
| Manny Juárez | 2032-2033 | 6 | 3 | .667 | 3.51 | 32 | 12 | 0 | 0 | 0 | 112.2 | 127 | 44 | 7 | 26 | 89 |
| Markus Jutzi | 2039-2039 | 3 | 1 | .750 | 1.88 | 4 | 4 | 1 | 1 | 0 | 28.2 | 24 | 6 | 2 | 5 | 29 |
