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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Kareem Jackson | 2025-2026 | 5 | 4 | .556 | 3.96 | 44 | 0 | 0 | 0 | 0 | 84.0 | 92 | 37 | 7 | 29 | 67 |
| Wally Jacob | 2025-2026 | 0 | 0 | .000 | 5.45 | 19 | 0 | 0 | 0 | 2 | 34.2 | 35 | 21 | 10 | 23 | 37 |
| Tim Jacobs | 2026-2026 | 1 | 1 | .500 | 6.20 | 13 | 1 | 0 | 0 | 0 | 20.1 | 32 | 14 | 3 | 11 | 10 |
| Harley Jacobsen | 2026-2026 | 0 | 1 | .000 | 6.00 | 1 | 1 | 0 | 0 | 0 | 6.0 | 11 | 4 | 0 | 2 | 6 |
| Jorge Jacome | 2024-2024 | 6 | 8 | .429 | 10.07 | 51 | 4 | 0 | 0 | 0 | 98.1 | 157 | 110 | 27 | 65 | 34 |
| Alexis Jaimes | 2025-2026 | 0 | 4 | .000 | 5.36 | 21 | 0 | 0 | 0 | 0 | 45.1 | 63 | 27 | 4 | 14 | 19 |
| Pedro Jimenez | 2026-2026 | 1 | 0 | 1.000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 3.2 | 5 | 0 | 0 | 0 | 4 |
| Adam Johnson | 2025-2025 | 2 | 2 | .500 | 5.06 | 7 | 7 | 0 | 0 | 0 | 37.1 | 40 | 21 | 5 | 12 | 24 |
| Dan Johnson | 2026-2026 | 1 | 0 | 1.000 | 1.50 | 2 | 1 | 0 | 0 | 0 | 6.0 | 5 | 1 | 0 | 0 | 3 |
| Trent Johnson | 2024-2026 | 9 | 11 | .450 | 6.23 | 57 | 23 | 0 | 0 | 2 | 176.1 | 226 | 122 | 28 | 100 | 126 |
| Bobby Jones | 2024-2024 | 7 | 1 | .875 | 1.58 | 9 | 7 | 0 | 0 | 0 | 45.2 | 41 | 8 | 3 | 10 | 29 |
| Chris Jones | 2026-2026 | 0 | 0 | .000 | 2.70 | 2 | 0 | 0 | 0 | 0 | 3.1 | 3 | 1 | 0 | 1 | 3 |
| Mitch Jones | 2025-2025 | 0 | 1 | .000 | 54.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 2 | 2 | 0 | 3 | 0 |
| Bert Juarez | 2026-2026 | 0 | 0 | .000 | 0.00 | 2 | 0 | 0 | 0 | 0 | 2.2 | 2 | 0 | 0 | 1 | 6 |
| Shane Justice | 2026-2026 | 0 | 1 | .000 | 17.36 | 2 | 0 | 0 | 0 | 0 | 4.2 | 10 | 9 | 0 | 5 | 2 |
