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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nate Jackson | 2031-2032 | 21 | 11 | .656 | 2.66 | 38 | 38 | 7 | 5 | 0 | 277.2 | 229 | 82 | 9 | 75 | 309 |
| Kenny James | 2035-2037 | 24 | 15 | .615 | 3.29 | 48 | 47 | 2 | 1 | 0 | 300.2 | 273 | 110 | 15 | 76 | 308 |
| Andrew Jamison | 2029-2029 | 2 | 0 | 1.000 | 3.91 | 7 | 0 | 0 | 0 | 1 | 25.1 | 26 | 11 | 2 | 8 | 19 |
| An Jang-Yop | 2024-2024 | 2 | 1 | .667 | 2.06 | 32 | 0 | 0 | 0 | 14 | 43.2 | 24 | 10 | 1 | 15 | 68 |
| Maxime Janssens | 2025-2025 | 1 | 2 | .333 | 5.85 | 5 | 5 | 0 | 0 | 0 | 20.0 | 28 | 13 | 1 | 9 | 12 |
| Alberto Jaramillo | 2036-2036 | 0 | 0 | .000 | 2.25 | 11 | 0 | 0 | 0 | 1 | 24.0 | 20 | 6 | 2 | 12 | 24 |
| Kostenka Jarovtsev | 2026-2030 | 3 | 12 | .200 | 4.51 | 20 | 18 | 4 | 1 | 0 | 123.2 | 122 | 62 | 7 | 61 | 77 |
| Miika Jarvi | 2029-2033 | 6 | 10 | .375 | 3.06 | 61 | 7 | 0 | 0 | 8 | 138.1 | 120 | 47 | 11 | 58 | 163 |
| Esteban Jiménez | 2026-2026 | 5 | 0 | 1.000 | 0.93 | 43 | 0 | 0 | 0 | 26 | 48.1 | 15 | 5 | 1 | 15 | 68 |
| Francisco Jiménez | 2024-2026 | 9 | 2 | .818 | 2.24 | 46 | 5 | 0 | 0 | 2 | 100.2 | 68 | 25 | 3 | 30 | 102 |
| Miguel Jiménez | 2021-2024 | 17 | 8 | .680 | 3.79 | 66 | 13 | 0 | 0 | 7 | 178.0 | 159 | 75 | 13 | 66 | 124 |
| Franklin Johnson | 2021-2024 | 0 | 0 | .000 | 6.00 | 3 | 0 | 0 | 0 | 0 | 6.0 | 8 | 4 | 0 | 2 | 2 |
| Mike Johnson | 2038-2038 | 2 | 5 | .286 | 5.68 | 34 | 0 | 0 | 0 | 0 | 52.1 | 55 | 33 | 3 | 21 | 49 |
| Census Johnston | 2025-2025 | 2 | 1 | .667 | 3.00 | 9 | 0 | 0 | 0 | 3 | 18.0 | 15 | 6 | 0 | 4 | 16 |
| Jeffery Johnston | 2038-2038 | 2 | 3 | .400 | 0.82 | 34 | 0 | 0 | 0 | 21 | 43.2 | 26 | 4 | 1 | 8 | 51 |
| Sam Johnston | 2036-2036 | 5 | 9 | .357 | 4.28 | 17 | 17 | 0 | 0 | 0 | 88.1 | 94 | 42 | 6 | 30 | 79 |
| George Johnstone | 2033-2034 | 5 | 7 | .417 | 4.18 | 29 | 10 | 1 | 1 | 2 | 99.0 | 105 | 46 | 4 | 31 | 58 |
| Nate Johnstone | 2034-2036 | 10 | 22 | .312 | 4.41 | 58 | 50 | 0 | 0 | 0 | 253.0 | 261 | 124 | 15 | 100 | 236 |
| Clarence Jones | 2035-2036 | 2 | 22 | .083 | 6.31 | 33 | 33 | 1 | 0 | 0 | 178.1 | 238 | 125 | 5 | 90 | 160 |
| Derek Jones | 2035-2035 | 7 | 11 | .389 | 5.88 | 24 | 24 | 0 | 0 | 0 | 145.1 | 180 | 95 | 8 | 71 | 114 |
| Vaughan Jones | 2036-2037 | 0 | 2 | .000 | 4.45 | 22 | 0 | 0 | 0 | 0 | 32.1 | 29 | 16 | 2 | 11 | 37 |
| Chris Jordan | 2036-2037 | 3 | 4 | .429 | 5.05 | 42 | 0 | 0 | 0 | 2 | 82.0 | 77 | 46 | 11 | 43 | 78 |
| Manu Jortikka | 2037-2037 | 2 | 1 | .667 | 2.66 | 9 | 9 | 0 | 0 | 0 | 44.0 | 36 | 13 | 3 | 9 | 62 |
| Otto Joseph | 2030-2030 | 8 | 1 | .889 | 1.90 | 17 | 11 | 0 | 0 | 0 | 80.2 | 54 | 17 | 5 | 21 | 76 |
| Jose Jovellanos | 2034-2037 | 7 | 11 | .389 | 3.93 | 52 | 31 | 0 | 0 | 1 | 194.2 | 194 | 85 | 14 | 59 | 188 |
| Jack Joyner | 2032-2032 | 7 | 0 | 1.000 | 1.38 | 9 | 9 | 0 | 0 | 0 | 65.1 | 52 | 10 | 1 | 18 | 52 |
| José Juárez | 2023-2023 | 2 | 1 | .667 | 2.57 | 28 | 0 | 0 | 0 | 2 | 35.0 | 29 | 10 | 0 | 13 | 33 |
| Orlando Juárez | 2022-2022 | 0 | 0 | .000 | 2.25 | 1 | 0 | 0 | 0 | 0 | 4.0 | 5 | 1 | 1 | 0 | 5 |
| Fernando Júlio | 2027-2028 | 4 | 6 | .400 | 3.75 | 15 | 9 | 2 | 0 | 0 | 74.1 | 75 | 31 | 2 | 23 | 63 |
| Júlio Justiniano | 2029-2033 | 11 | 16 | .407 | 4.01 | 98 | 0 | 0 | 0 | 16 | 114.1 | 127 | 51 | 4 | 51 | 124 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Behar Jusufi | 2026-2029 | 10 | 19 | .345 | 3.48 | 56 | 46 | 0 | 0 | 0 | 292.1 | 257 | 113 | 23 | 104 | 302 |
