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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| Abraham Jacobs | 2020-2021 | .247 | 12 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| An Jang-Yop | 2024-2024 | .000 | 0 | 0 | 2 | 1 | 14 | 2.06 | 68 |
| Scott Janousek | 2024-2024 | .261 | 8 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Maxime Janssens | 2025-2025 | .000 | 0 | 0 | 1 | 2 | 0 | 5.85 | 12 |
| Kostenka Jarovtsev | 2026-2026 | .000 | 0 | 0 | 3 | 10 | 0 | 4.42 | 67 |
| Raúl Javier Jr. | 2020-2022 | .247 | 13 | 91 | 0 | 0 | 0 | 0.00 | 0 |
| Everette Jeffers | 2022-2022 | .211 | 0 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Jelarde | 2020-2020 | .500 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Jerry Jensen | 2026-2026 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| António Jiménez | 2022-2022 | .265 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Aurelio Jiménez | 2026-2026 | .189 | 1 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Esteban Jiménez | 2026-2026 | .000 | 0 | 0 | 5 | 0 | 26 | 0.93 | 68 |
| Felipe Jiménez | 2021-2021 | .207 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Fernando Jiménez | 2022-2023 | .244 | 1 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Jiménez | 2024-2026 | .000 | 0 | 0 | 9 | 2 | 2 | 2.24 | 102 |
| Gilberto Jiménez | 2025-2025 | .242 | 1 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| José Jiménez | 2026-2026 | .155 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Jiménez | 2021-2024 | .000 | 0 | 0 | 17 | 8 | 7 | 3.79 | 124 |
| Pedro Jiménez | 2020-2021 | .225 | 1 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Franklin Johnson | 2021-2024 | .000 | 0 | 0 | 0 | 0 | 0 | 6.00 | 2 |
| Stephen Johnson | 2021-2022 | .222 | 0 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Census Johnston | 2025-2025 | .000 | 0 | 0 | 2 | 1 | 3 | 3.00 | 16 |
| Jeffrey Jones | 2021-2025 | .191 | 2 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Obi Jones | 2026-2026 | .165 | 0 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Robert Jones | 2020-2020 | .500 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Jones | 2022-2022 | .389 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Timothy Jones | 2022-2022 | .193 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Gabriel Juárez | 2020-2021 | .261 | 2 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| José Juárez | 2023-2023 | .000 | 0 | 0 | 2 | 1 | 2 | 2.57 | 33 |
| Orlando Juárez | 2022-2022 | .000 | 0 | 0 | 0 | 0 | 0 | 2.25 | 5 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Behar Jusufi | 2026-2026 | .000 | 0 | 0 | 3 | 7 | 0 | 4.15 | 80 |
