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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 |
|---|---|---|---|---|---|---|---|---|---|
| Chris Jackman | 2024-2024 | .228 | 7 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Jules Jacquemin | 2026-2026 | .000 | 0 | 0 | 3 | 3 | 0 | 4.41 | 52 |
| Cédric Janvier | 2025-2025 | .279 | 3 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Aaron Jarville | 2024-2024 | .200 | 7 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Stéphane Jeanne | 2024-2024 | .143 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Alain Jeannin | 2028-2028 | .000 | 0 | 0 | 2 | 4 | 0 | 6.71 | 54 |
| Ai-de Jen | 2018-2018 | .000 | 0 | 0 | 0 | 2 | 2 | 4.84 | 36 |
| Stephen Jerram | 2021-2021 | .245 | 11 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Lawrence Jewers | 2016-2016 | .339 | 18 | 66 | 0 | 0 | 0 | 0.00 | 0 |
| José Jiménez | 2021-2021 | .358 | 5 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Rafael Jiménez | 2022-2022 | .000 | 0 | 0 | 1 | 2 | 7 | 4.03 | 35 |
| Hai-dong Joe | 2016-2016 | .366 | 21 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Zheng-ze Joe | 2026-2026 | .268 | 15 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Kennan Johannson | 2017-2017 | .000 | 0 | 0 | 5 | 2 | 0 | 3.27 | 68 |
| Ronnie Johnson | 2019-2019 | .354 | 10 | 64 | 0 | 0 | 0 | 0.00 | 0 |
| John Johnston | 2027-2027 | .303 | 2 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Mark Johnston | 2028-2028 | .248 | 8 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| John Johnstone | 2023-2023 | .000 | 0 | 0 | 1 | 0 | 0 | 4.76 | 11 |
| Jordan Johnstone | 2012-2012 | .000 | 0 | 0 | 6 | 3 | 0 | 2.91 | 81 |
| Gilles Joly | 2028-2028 | .000 | 0 | 0 | 2 | 1 | 0 | 6.67 | 76 |
| Kevin Joly | 2026-2026 | .000 | 0 | 0 | 1 | 4 | 0 | 8.67 | 40 |
| Oscar Jones | 2019-2019 | .335 | 13 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Nicolas Joubert | 2028-2028 | .000 | 0 | 0 | 3 | 1 | 0 | 4.44 | 62 |
| Dimitri Jourdan | 2025-2025 | .000 | 0 | 0 | 3 | 1 | 0 | 4.40 | 24 |
| George Joy | 2028-2028 | .288 | 3 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Conner Juan | 2025-2025 | .000 | 0 | 0 | 2 | 1 | 0 | 7.82 | 32 |
| Wen-huan Juan | 2023-2023 | .000 | 0 | 0 | 1 | 5 | 0 | 6.39 | 49 |
