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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Gilberto Ibarra | 2017-2019 | 19 | 8 | .704 | 6.91 | 129 | 7 | 0 | 0 | 3 | 238.1 | 300 | 183 | 47 | 118 | 190 |
| Patrick Ibáñez | 2035-2046 | 46 | 44 | .511 | 3.96 | 152 | 116 | 1 | 0 | 3 | 743.0 | 712 | 327 | 88 | 294 | 588 |
| Katai Ichikawa | 2020-2020 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.2 | 1 | 0 | 0 | 0 | 2 |
| Yoshihide Ichikawa | 2056-2056 | 0 | 0 | .000 | 3.38 | 4 | 0 | 0 | 0 | 0 | 8.0 | 8 | 3 | 1 | 6 | 5 |
| Isaaka Ienimea | 2045-2046 | 1 | 0 | 1.000 | 3.38 | 7 | 0 | 0 | 0 | 1 | 10.2 | 12 | 4 | 1 | 4 | 9 |
| Tetsunori Ikarashi | 2035-2036 | 9 | 7 | .562 | 4.75 | 24 | 19 | 2 | 0 | 0 | 136.1 | 139 | 72 | 7 | 78 | 53 |
| Yoshii Ikeda | 2030-2043 | 1 | 5 | .167 | 4.21 | 18 | 8 | 0 | 0 | 0 | 92.0 | 93 | 43 | 5 | 21 | 55 |
| Huibert Illidge | 2045-2055 | 14 | 4 | .778 | 2.18 | 23 | 23 | 1 | 0 | 0 | 140.1 | 108 | 34 | 11 | 24 | 125 |
| Erick Indiano | 2037-2041 | 4 | 1 | .800 | 3.91 | 46 | 0 | 0 | 0 | 23 | 53.0 | 52 | 23 | 0 | 30 | 48 |
| Katsumoto Ine | 2047-2051 | 26 | 43 | .377 | 3.92 | 109 | 96 | 2 | 1 | 0 | 603.2 | 583 | 263 | 75 | 174 | 381 |
| Eugene Ingram | 2057-2058 | 5 | 2 | .714 | 1.86 | 26 | 0 | 0 | 0 | 3 | 38.2 | 32 | 8 | 4 | 7 | 29 |
| Toshio Inoue | 2050-2050 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 2.0 | 1 | 0 | 0 | 1 | 0 |
| Yuto Inugami | 2044-2044 | 1 | 1 | .500 | 4.05 | 6 | 0 | 0 | 0 | 0 | 6.2 | 4 | 3 | 0 | 5 | 1 |
| Ikaaka Iokia | 2052-2056 | 0 | 5 | .000 | 5.79 | 28 | 0 | 0 | 0 | 12 | 28.0 | 37 | 18 | 5 | 20 | 22 |
| Christian Irgoyen | 2028-2033 | 7 | 15 | .318 | 7.02 | 32 | 32 | 0 | 0 | 0 | 174.1 | 219 | 136 | 20 | 122 | 147 |
| Hengkie Iriawan | 2041-2042 | 5 | 6 | .455 | 4.43 | 22 | 22 | 0 | 0 | 0 | 126.0 | 137 | 62 | 11 | 40 | 59 |
| Caspar Irwin | 2035-2037 | 1 | 1 | .500 | 5.91 | 6 | 0 | 0 | 0 | 0 | 10.2 | 14 | 7 | 1 | 3 | 6 |
| Ron Irwin | 2019-2019 | 0 | 1 | .000 | 4.43 | 14 | 0 | 0 | 0 | 2 | 20.1 | 23 | 10 | 4 | 6 | 17 |
| Wilbert Irwin | 2058-2061 | 13 | 29 | .310 | 4.57 | 65 | 63 | 3 | 0 | 0 | 389.2 | 425 | 198 | 25 | 208 | 293 |
| Mitchell Isaacs | 2043-2049 | 12 | 17 | .414 | 4.73 | 118 | 0 | 0 | 0 | 13 | 194.0 | 179 | 102 | 19 | 112 | 209 |
| Akihito Ishikawa | 2057-2061 | 3 | 13 | .188 | 6.09 | 46 | 19 | 0 | 0 | 0 | 130.0 | 162 | 88 | 15 | 88 | 110 |
| Tadayuki Ito | 2039-2046 | 15 | 12 | .556 | 4.06 | 129 | 8 | 0 | 0 | 9 | 268.0 | 254 | 121 | 30 | 102 | 183 |
| Travis Iturburua | 2044-2045 | 2 | 0 | 1.000 | 2.86 | 29 | 0 | 0 | 0 | 1 | 50.1 | 46 | 16 | 7 | 11 | 30 |
| Anatoly Ivanovich | 2029-2029 | 2 | 2 | .500 | 3.15 | 9 | 9 | 1 | 1 | 0 | 45.2 | 32 | 16 | 5 | 33 | 44 |
| Shoichi Iwata | 2045-2049 | 13 | 24 | .351 | 5.48 | 65 | 50 | 2 | 1 | 1 | 315.1 | 321 | 192 | 49 | 170 | 212 |
