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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 | 2039-2039 | 2 | 4 | .333 | 4.94 | 10 | 10 | 0 | 0 | 0 | 58.1 | 63 | 32 | 0 | 21 | 51 |
| Craig Jacobs | 2040-2040 | 0 | 0 | .000 | 3.16 | 18 | 0 | 0 | 0 | 1 | 51.1 | 45 | 18 | 3 | 12 | 54 |
| Jessie James | 2037-2037 | 0 | 1 | .000 | 3.68 | 1 | 1 | 0 | 0 | 0 | 7.1 | 10 | 3 | 0 | 1 | 6 |
| Rodger James | 2035-2036 | 8 | 8 | .500 | 5.28 | 39 | 10 | 2 | 0 | 1 | 131.1 | 159 | 77 | 9 | 39 | 111 |
| Dane Jane | 2035-2035 | 1 | 1 | .500 | 4.72 | 6 | 0 | 0 | 0 | 0 | 13.1 | 11 | 7 | 1 | 4 | 9 |
| Job Janssen | 2036-2036 | 1 | 0 | 1.000 | 3.68 | 4 | 0 | 0 | 0 | 0 | 7.1 | 8 | 3 | 0 | 3 | 10 |
| Lex Janssen | 2034-2035 | 12 | 5 | .706 | 3.50 | 40 | 15 | 2 | 0 | 1 | 138.2 | 119 | 54 | 10 | 42 | 173 |
| John Jennings | 2038-2039 | 2 | 0 | 1.000 | 2.27 | 19 | 1 | 0 | 0 | 1 | 39.2 | 29 | 10 | 2 | 9 | 45 |
| António Jiménez | 2032-2032 | 1 | 0 | 1.000 | 3.94 | 11 | 0 | 0 | 0 | 0 | 32.0 | 41 | 14 | 2 | 7 | 32 |
| Jesús Jiménez | 2037-2037 | 1 | 2 | .333 | 5.68 | 11 | 0 | 0 | 0 | 2 | 19.0 | 16 | 12 | 2 | 8 | 12 |
| Rodney Johnson | 2040-2040 | 9 | 5 | .643 | 2.72 | 15 | 15 | 0 | 0 | 0 | 86.0 | 71 | 26 | 2 | 18 | 90 |
| Stephen Johnson | 2039-2039 | 3 | 4 | .429 | 6.80 | 31 | 0 | 0 | 0 | 4 | 42.1 | 64 | 32 | 6 | 23 | 27 |
| Albert Johnston | 2033-2033 | 0 | 2 | .000 | 1.69 | 20 | 0 | 0 | 0 | 3 | 42.2 | 30 | 8 | 2 | 17 | 45 |
| Jacob Johnston | 2032-2032 | 0 | 3 | .000 | 5.55 | 19 | 2 | 1 | 0 | 1 | 47.0 | 63 | 29 | 4 | 11 | 49 |
| Nate Johnstone | 2033-2033 | 1 | 6 | .143 | 4.92 | 19 | 14 | 0 | 0 | 0 | 60.1 | 83 | 33 | 11 | 18 | 50 |
| Domingo Jones | 2040-2041 | 5 | 5 | .500 | 3.03 | 55 | 0 | 0 | 0 | 25 | 74.1 | 72 | 25 | 2 | 28 | 85 |
| Ralph Jones | 2041-2041 | 0 | 0 | .000 | 1.42 | 2 | 0 | 0 | 0 | 1 | 6.1 | 2 | 1 | 1 | 0 | 11 |
| Vaughan Jones | 2034-2034 | 1 | 0 | 1.000 | 3.10 | 18 | 0 | 0 | 0 | 10 | 20.1 | 22 | 7 | 0 | 5 | 28 |
| Francisco Josafat | 2033-2033 | 3 | 4 | .429 | 6.42 | 17 | 0 | 0 | 0 | 1 | 33.2 | 44 | 24 | 9 | 8 | 20 |
| King Joseph | 2041-2041 | 0 | 1 | .000 | 7.71 | 1 | 1 | 0 | 0 | 0 | 4.2 | 8 | 4 | 0 | 0 | 5 |
| Rob Joseph | 2037-2037 | 0 | 0 | .000 | 21.00 | 2 | 0 | 0 | 0 | 0 | 3.0 | 10 | 7 | 0 | 1 | 3 |
| Jose Jovellanos | 2033-2033 | 1 | 0 | 1.000 | 2.16 | 6 | 3 | 0 | 0 | 0 | 16.2 | 15 | 4 | 0 | 1 | 20 |
| Markus Jutzi | 2038-2038 | 13 | 7 | .650 | 3.57 | 22 | 22 | 1 | 0 | 0 | 136.0 | 142 | 54 | 6 | 38 | 121 |
