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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ash Ibarra | 2022-2024 | 22 | 16 | .579 | 2.88 | 59 | 59 | 1 | 0 | 0 | 365.0 | 312 | 117 | 13 | 132 | 364 |
| Javier Ibarra | 2031-2031 | 1 | 2 | .333 | 3.57 | 10 | 0 | 0 | 0 | 0 | 17.2 | 19 | 7 | 4 | 4 | 14 |
| Juan Ibarra | 2032-2034 | 5 | 2 | .714 | 4.32 | 31 | 0 | 0 | 0 | 1 | 50.0 | 54 | 24 | 2 | 34 | 50 |
| Isaaka Ienimea | 2032-2032 | 12 | 5 | .706 | 2.68 | 22 | 22 | 4 | 2 | 0 | 154.1 | 107 | 46 | 13 | 33 | 176 |
| Johnny Ijzendoorn | 2040-2040 | 1 | 4 | .200 | 4.88 | 24 | 6 | 1 | 0 | 1 | 62.2 | 83 | 34 | 8 | 19 | 57 |
| Erik Illescas | 2029-2030 | 6 | 3 | .667 | 2.61 | 32 | 4 | 0 | 0 | 5 | 72.1 | 64 | 21 | 3 | 24 | 78 |
| Leo Ingelbrigtsen | 2028-2030 | 9 | 5 | .643 | 3.56 | 45 | 0 | 0 | 0 | 7 | 86.0 | 72 | 34 | 7 | 30 | 81 |
| Yeijiro Inoue | 2040-2040 | 0 | 7 | .000 | 7.19 | 27 | 0 | 0 | 0 | 0 | 41.1 | 64 | 33 | 6 | 20 | 38 |
| Bobby Irvine | 2025-2026 | 0 | 3 | .000 | 4.39 | 9 | 8 | 0 | 0 | 0 | 26.2 | 31 | 13 | 2 | 10 | 23 |
| Mitchell Isaacs | 2041-2041 | 0 | 4 | .000 | 3.41 | 22 | 0 | 0 | 0 | 5 | 29.0 | 38 | 11 | 2 | 13 | 34 |
| Tadao Ishihara | 2042-2042 | 6 | 7 | .462 | 4.61 | 15 | 15 | 1 | 1 | 0 | 95.2 | 115 | 49 | 5 | 31 | 52 |
| Masaki Ito | 2037-2040 | 19 | 12 | .613 | 2.28 | 95 | 39 | 0 | 0 | 9 | 335.2 | 254 | 85 | 15 | 118 | 500 |
| Motoyuki Ito | 2032-2032 | 4 | 0 | 1.000 | 5.40 | 16 | 0 | 0 | 0 | 0 | 48.1 | 56 | 29 | 6 | 32 | 38 |
| Travis Iturburua | 2039-2040 | 6 | 6 | .500 | 3.54 | 71 | 0 | 0 | 0 | 11 | 76.1 | 69 | 30 | 6 | 20 | 78 |
| Anatoly Ivanovich | 2025-2026 | 10 | 9 | .526 | 2.73 | 27 | 27 | 0 | 0 | 0 | 175.0 | 147 | 53 | 4 | 56 | 168 |
| Naoaki Iwasaki | 2034-2034 | 0 | 0 | .000 | 5.14 | 3 | 0 | 0 | 0 | 0 | 7.0 | 7 | 4 | 1 | 3 | 10 |
| Shoichi Iwata | 2041-2042 | 4 | 2 | .667 | 2.80 | 26 | 0 | 0 | 0 | 2 | 64.1 | 40 | 20 | 4 | 28 | 82 |
| Emesto Izquierdo | 2026-2026 | 0 | 0 | .000 | 54.00 | 3 | 0 | 0 | 0 | 0 | 0.2 | 4 | 4 | 0 | 0 | 2 |
