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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jules Jacquemin | 2026-2026 | 3 | 3 | .500 | 4.41 | 13 | 13 | 0 | 0 | 0 | 63.1 | 77 | 31 | 10 | 25 | 52 |
| Ai-de Jen | 2018-2018 | 0 | 2 | .000 | 4.84 | 36 | 0 | 0 | 0 | 2 | 35.1 | 46 | 19 | 6 | 9 | 36 |
| Rafael Jiménez | 2022-2022 | 1 | 2 | .333 | 4.03 | 20 | 0 | 0 | 0 | 7 | 22.1 | 15 | 10 | 1 | 14 | 35 |
| Kennan Johannson | 2017-2017 | 5 | 2 | .714 | 3.27 | 11 | 11 | 0 | 0 | 0 | 66.0 | 59 | 24 | 3 | 23 | 68 |
| John Johnstone | 2023-2023 | 1 | 0 | 1.000 | 4.76 | 8 | 0 | 0 | 0 | 0 | 11.1 | 7 | 6 | 4 | 6 | 11 |
| Jordan Johnstone | 2012-2012 | 6 | 3 | .667 | 2.91 | 13 | 13 | 1 | 0 | 0 | 80.1 | 73 | 26 | 5 | 29 | 81 |
| Kevin Joly | 2026-2026 | 1 | 4 | .200 | 8.67 | 32 | 0 | 0 | 0 | 0 | 45.2 | 66 | 44 | 8 | 42 | 40 |
| Dimitri Jourdan | 2025-2025 | 3 | 1 | .750 | 4.40 | 23 | 0 | 0 | 0 | 0 | 28.2 | 22 | 14 | 2 | 33 | 24 |
| Conner Juan | 2025-2025 | 2 | 1 | .667 | 7.82 | 27 | 0 | 0 | 0 | 0 | 35.2 | 40 | 31 | 8 | 32 | 32 |
| Wen-huan Juan | 2023-2023 | 1 | 5 | .167 | 6.39 | 11 | 11 | 0 | 0 | 0 | 49.1 | 56 | 35 | 9 | 42 | 49 |
