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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 |
|---|---|---|---|---|---|---|---|---|---|
| Kent Jackson | 2021-2021 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Corbin Jameson | 2024-2025 | .000 | 0 | 0 | 8 | 8 | 13 | 3.15 | 158 |
| An Jang-Yop | 2022-2022 | .000 | 0 | 0 | 2 | 4 | 1 | 3.23 | 42 |
| Maxime Janssens | 2025-2025 | .000 | 0 | 0 | 6 | 4 | 0 | 2.30 | 48 |
| José Jarca | 2024-2024 | .228 | 6 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Marty Jennings | 2020-2020 | .296 | 0 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Esteban Jiménez | 2024-2024 | .000 | 0 | 0 | 3 | 6 | 0 | 3.43 | 62 |
| Ji Jing | 2025-2025 | .000 | 0 | 0 | 4 | 3 | 0 | 2.06 | 84 |
| Kevin Johnson | 2023-2023 | .281 | 2 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Curt Johnston | 2021-2022 | .242 | 4 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Larry Johnston | 2020-2020 | .280 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Ron Johnston | 2021-2021 | .287 | 2 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Harrison Jones | 2020-2020 | .269 | 1 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Leon Jones | 2022-2022 | .000 | 0 | 0 | 1 | 2 | 0 | 4.68 | 14 |
| Robert Jones | 2021-2021 | .295 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Jones | 2021-2022 | .188 | 3 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Jing-sheng Joo | 2024-2025 | .234 | 1 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Ricco Jovine | 2024-2025 | .194 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Arlen Joysey | 2023-2023 | .313 | 4 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| José Juárez | 2020-2021 | .000 | 0 | 0 | 5 | 8 | 11 | 3.52 | 95 |
| Tony Justice | 2022-2022 | .419 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
