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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Abel Ibañez | 2021-2026 | 20 | 12 | .625 | 5.34 | 263 | 0 | 0 | 0 | 5 | 308.1 | 329 | 183 | 54 | 154 | 340 |
| Felix Ibañez | 2018-2031 | 71 | 48 | .597 | 4.04 | 916 | 0 | 0 | 0 | 18 | 1163.2 | 1389 | 522 | 124 | 177 | 488 |
| Alejandro Ibarra | 2046-2046 | 0 | 0 | .000 | 36.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 4 | 4 | 1 | 0 | 1 |
| Jesús Ibarra | 2055-2066 | 80 | 102 | .440 | 4.73 | 374 | 223 | 22 | 5 | 10 | 1666.1 | 1846 | 875 | 233 | 408 | 1165 |
| Salvador Ibarra | 2040-2058 | 364 | 109 | .770 | 2.09 | 694 | 630 | 54 | 21 | 4 | 4623.0 | 3585 | 1073 | 122 | 688 | 4664 |
| Juan Ibarria | 2058-2066 | 88 | 39 | .693 | 4.66 | 286 | 137 | 11 | 0 | 11 | 1195.0 | 1346 | 619 | 162 | 332 | 979 |
| Benny Ijzendoorn | 2047-2057 | 45 | 32 | .584 | 4.49 | 588 | 0 | 0 | 0 | 50 | 707.0 | 679 | 353 | 109 | 290 | 555 |
| Isamu Ikarashi | 2062-2063 | 9 | 10 | .474 | 5.52 | 44 | 22 | 0 | 0 | 1 | 179.1 | 197 | 110 | 30 | 107 | 148 |
| Akira Ikeda | 2063-2065 | 9 | 20 | .310 | 6.68 | 89 | 31 | 0 | 0 | 3 | 265.1 | 338 | 197 | 34 | 179 | 184 |
| Toshikuni Ine | 2055-2066 | 78 | 75 | .510 | 4.66 | 254 | 199 | 13 | 1 | 0 | 1391.2 | 1459 | 720 | 244 | 362 | 1069 |
| Leslie Ingle | 2041-2046 | 17 | 13 | .567 | 5.34 | 256 | 0 | 0 | 0 | 4 | 300.0 | 300 | 178 | 58 | 135 | 250 |
| Gilberto Iosario | 2036-2040 | 1 | 1 | .500 | 3.73 | 21 | 1 | 0 | 0 | 0 | 31.1 | 32 | 13 | 1 | 24 | 17 |
| Anthony Irwin | 2043-2059 | 168 | 164 | .506 | 4.39 | 516 | 446 | 7 | 3 | 3 | 2808.1 | 2540 | 1370 | 446 | 1061 | 2770 |
| Doug Irwin | 2064-2066 | 2 | 4 | .333 | 6.63 | 82 | 0 | 0 | 0 | 6 | 148.0 | 186 | 109 | 29 | 67 | 133 |
| Russ Irwin | 2038-2038 | 0 | 0 | .000 | 20.57 | 5 | 0 | 0 | 0 | 0 | 7.0 | 15 | 16 | 6 | 13 | 2 |
| Kurt Isenberg | 2007-2017 | 35 | 50 | .412 | 4.97 | 155 | 124 | 0 | 0 | 5 | 691.2 | 791 | 382 | 92 | 237 | 469 |
| Paul Iser | 2028-2034 | 13 | 15 | .464 | 4.63 | 354 | 0 | 0 | 0 | 7 | 371.2 | 396 | 191 | 42 | 143 | 279 |
| Tetsu Ishihara | 2062-2065 | 14 | 17 | .452 | 5.23 | 156 | 17 | 1 | 0 | 11 | 282.1 | 285 | 164 | 54 | 117 | 295 |
| Kazuhisa Ishii | 2002-2007 | 51 | 59 | .464 | 4.74 | 178 | 144 | 0 | 0 | 0 | 837.0 | 774 | 441 | 78 | 531 | 811 |
| Leon Ishmael | 2025-2030 | 35 | 42 | .455 | 4.22 | 156 | 103 | 2 | 0 | 0 | 687.0 | 765 | 322 | 85 | 182 | 475 |
| Jason Isringhausen | 1995-2011 | 64 | 54 | .542 | 3.82 | 703 | 52 | 3 | 1 | 166 | 1046.0 | 1013 | 444 | 36 | 422 | 938 |
| Michizane Ito | 2038-2041 | 50 | 49 | .505 | 3.69 | 122 | 122 | 0 | 0 | 0 | 767.1 | 767 | 315 | 92 | 137 | 668 |
| Paul Ivey | 2039-2042 | 22 | 23 | .489 | 4.39 | 67 | 63 | 1 | 0 | 0 | 392.0 | 400 | 191 | 32 | 145 | 279 |
