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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Larry Ibarra | 2022-2025 | 9 | 6 | .600 | 4.55 | 49 | 17 | 0 | 0 | 7 | 140.1 | 147 | 71 | 24 | 61 | 106 |
| Mario Ibarra | 2019-2022 | 2 | 2 | .500 | 5.31 | 59 | 0 | 0 | 0 | 1 | 81.1 | 86 | 48 | 8 | 38 | 68 |
| Francisco Ibáñez | 2029-2030 | 1 | 0 | 1.000 | 4.91 | 2 | 0 | 0 | 0 | 0 | 3.2 | 5 | 2 | 1 | 1 | 3 |
| Katsuhito Ine | 2026-2031 | 11 | 33 | .250 | 6.65 | 79 | 66 | 0 | 0 | 0 | 349.0 | 461 | 258 | 51 | 128 | 242 |
| Roger Ingram | 2004-2004 | 0 | 4 | .000 | 6.67 | 55 | 0 | 0 | 0 | 2 | 54.0 | 68 | 40 | 16 | 30 | 51 |
| Ron Ingram | 2023-2031 | 38 | 54 | .413 | 4.92 | 278 | 102 | 1 | 0 | 5 | 916.1 | 1031 | 501 | 98 | 331 | 586 |
| Kazuhisa Ishii | 2002-2011 | 14 | 26 | .350 | 6.00 | 145 | 58 | 0 | 0 | 2 | 402.1 | 433 | 268 | 65 | 270 | 408 |
| Jason Isringhausen | 1995-2005 | 78 | 99 | .441 | 4.29 | 250 | 247 | 8 | 1 | 0 | 1451.1 | 1429 | 691 | 195 | 538 | 1171 |
| Tsuneyo Ito | 2028-2031 | 40 | 26 | .606 | 4.39 | 141 | 66 | 1 | 1 | 14 | 485.1 | 485 | 237 | 55 | 133 | 426 |
| Hisashi Iwakuma | 2015-2018 | 4 | 9 | .308 | 6.21 | 76 | 0 | 0 | 0 | 3 | 111.2 | 126 | 77 | 18 | 66 | 69 |
| Hansel Izquierdo | 2005-2012 | 12 | 6 | .667 | 4.73 | 142 | 0 | 0 | 0 | 1 | 154.0 | 148 | 81 | 23 | 68 | 99 |
