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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jamie Jackson | 2026-2026 | 0 | 0 | .000 | 13.50 | 1 | 0 | 0 | 0 | 0 | 2.2 | 6 | 4 | 1 | 2 | 3 |
| Kareem Jackson | 2025-2026 | 8 | 7 | .533 | 4.09 | 58 | 0 | 0 | 0 | 1 | 114.1 | 127 | 52 | 10 | 36 | 79 |
| Wally Jacob | 2025-2026 | 3 | 1 | .750 | 5.92 | 32 | 0 | 0 | 0 | 3 | 62.1 | 68 | 41 | 15 | 37 | 51 |
| Tim Jacobs | 2026-2026 | 4 | 2 | .667 | 5.05 | 40 | 1 | 0 | 0 | 1 | 71.1 | 98 | 40 | 7 | 30 | 59 |
| Harley Jacobsen | 2026-2026 | 1 | 3 | .250 | 5.84 | 5 | 5 | 0 | 0 | 0 | 24.2 | 38 | 16 | 2 | 3 | 15 |
| 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 | 2 | 7 | .222 | 6.01 | 35 | 5 | 0 | 0 | 1 | 91.1 | 119 | 61 | 11 | 41 | 41 |
| Pedro Jimenez | 2026-2026 | 2 | 0 | 1.000 | 2.08 | 16 | 0 | 0 | 0 | 2 | 39.0 | 41 | 9 | 4 | 7 | 34 |
| 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 | 3 | 2 | .600 | 1.59 | 13 | 6 | 0 | 0 | 1 | 28.1 | 20 | 5 | 0 | 5 | 20 |
| Trent Johnson | 2024-2026 | 11 | 12 | .478 | 5.55 | 72 | 26 | 0 | 0 | 3 | 223.2 | 284 | 138 | 30 | 115 | 158 |
| 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 | 1 | 0 | 1.000 | 1.50 | 6 | 0 | 0 | 0 | 0 | 12.0 | 7 | 2 | 1 | 3 | 7 |
| 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 | 3 | 3 | .500 | 3.25 | 17 | 3 | 0 | 0 | 4 | 36.0 | 33 | 13 | 4 | 11 | 29 |
| Shane Justice | 2026-2026 | 0 | 1 | .000 | 17.36 | 2 | 0 | 0 | 0 | 0 | 4.2 | 10 | 9 | 0 | 5 | 2 |
