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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Howard Jamerson | 2027-2028 | 1 | 2 | .333 | 5.34 | 10 | 3 | 0 | 0 | 0 | 28.2 | 32 | 17 | 3 | 15 | 27 |
| Corbin Jameson | 2024-2025 | 8 | 8 | .500 | 3.15 | 88 | 0 | 0 | 0 | 13 | 125.2 | 110 | 44 | 11 | 50 | 158 |
| An Jang-Yop | 2022-2022 | 2 | 4 | .333 | 3.23 | 17 | 10 | 0 | 0 | 1 | 78.0 | 73 | 28 | 4 | 38 | 42 |
| Maxime Janssens | 2025-2025 | 6 | 4 | .600 | 2.30 | 12 | 11 | 1 | 0 | 0 | 74.1 | 72 | 19 | 3 | 16 | 48 |
| Guomez Jardim | 2026-2026 | 1 | 0 | 1.000 | 1.17 | 3 | 0 | 0 | 0 | 0 | 7.2 | 6 | 1 | 0 | 2 | 5 |
| Esteban Jiménez | 2024-2024 | 3 | 6 | .333 | 3.43 | 12 | 12 | 1 | 0 | 0 | 76.0 | 81 | 29 | 0 | 38 | 62 |
| Ji Jing | 2025-2025 | 4 | 3 | .571 | 2.06 | 10 | 10 | 1 | 0 | 0 | 70.0 | 61 | 16 | 1 | 19 | 84 |
| Ton Jobse | 2028-2028 | 6 | 5 | .545 | 3.12 | 16 | 16 | 0 | 0 | 0 | 115.1 | 109 | 40 | 2 | 39 | 136 |
| Leon Jones | 2022-2022 | 1 | 2 | .333 | 4.68 | 4 | 4 | 0 | 0 | 0 | 25.0 | 29 | 13 | 1 | 10 | 14 |
| José Juárez | 2020-2021 | 5 | 8 | .385 | 3.52 | 38 | 10 | 1 | 0 | 11 | 102.1 | 102 | 40 | 5 | 46 | 95 |
