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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 |
| Kostenka Jarovtsev | 2026-2030 | 3 | 12 | .200 | 4.51 | 20 | 18 | 4 | 1 | 0 | 123.2 | 122 | 62 | 7 | 61 | 77 |
| Miika Jarvi | 2029-2030 | 1 | 1 | .500 | 2.35 | 9 | 0 | 0 | 0 | 1 | 15.1 | 12 | 4 | 1 | 7 | 12 |
| 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 |
| Census Johnston | 2025-2025 | 2 | 1 | .667 | 3.00 | 9 | 0 | 0 | 0 | 3 | 18.0 | 15 | 6 | 0 | 4 | 16 |
| Otto Joseph | 2030-2030 | 8 | 1 | .889 | 1.90 | 17 | 11 | 0 | 0 | 0 | 80.2 | 54 | 17 | 5 | 21 | 76 |
| 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 | 2029-2030 | 5 | 1 | .833 | 2.28 | 29 | 0 | 0 | 0 | 1 | 27.2 | 29 | 7 | 2 | 11 | 22 |
| Behar Jusufi | 2026-2029 | 10 | 19 | .345 | 3.48 | 56 | 46 | 0 | 0 | 0 | 292.1 | 257 | 113 | 23 | 104 | 302 |
