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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mike Jacobs | 2039-2039 | 2 | 2 | .500 | 1.07 | 8 | 5 | 0 | 0 | 0 | 33.2 | 26 | 4 | 2 | 5 | 16 |
| Axel Jacoby | 2034-2037 | 16 | 15 | .516 | 2.75 | 48 | 48 | 0 | 0 | 0 | 248.1 | 195 | 76 | 17 | 83 | 247 |
| Oscar Jarrold | 2033-2035 | 4 | 3 | .571 | 3.27 | 45 | 1 | 0 | 0 | 3 | 93.2 | 77 | 34 | 9 | 19 | 93 |
| Wei-fang Jianbua | 2039-2039 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 0 | 0 | 0 | 1 | 1 |
| Zai-shuo Jin | 2038-2040 | 8 | 6 | .571 | 2.64 | 54 | 0 | 0 | 0 | 11 | 64.2 | 47 | 19 | 8 | 27 | 45 |
| Dean Johannson | 2040-2040 | 0 | 4 | .000 | 6.98 | 10 | 6 | 0 | 0 | 0 | 29.2 | 40 | 23 | 6 | 11 | 17 |
| Kyle Johnstone | 2029-2032 | 15 | 9 | .625 | 2.67 | 42 | 42 | 0 | 0 | 0 | 212.0 | 171 | 63 | 10 | 76 | 213 |
| Ryutaro Jouda | 2036-2039 | 10 | 12 | .455 | 4.93 | 47 | 12 | 0 | 0 | 0 | 129.2 | 146 | 71 | 19 | 59 | 72 |
| Sakutaro Jouda | 2037-2040 | 5 | 14 | .263 | 3.77 | 25 | 22 | 0 | 0 | 0 | 119.1 | 99 | 50 | 12 | 48 | 45 |
| Sugimoto Jouon | 2038-2040 | 5 | 3 | .625 | 3.30 | 42 | 2 | 1 | 0 | 1 | 76.1 | 66 | 28 | 5 | 26 | 37 |
| Blaine Julien | 2030-2033 | 5 | 4 | .556 | 2.81 | 38 | 5 | 0 | 0 | 17 | 57.2 | 51 | 18 | 5 | 19 | 90 |
