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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 | 2018-2018 | 2 | 1 | .667 | 2.63 | 11 | 0 | 0 | 0 | 0 | 13.2 | 14 | 4 | 0 | 3 | 18 |
| Mario Ibarra | 2015-2015 | 0 | 3 | .000 | 5.62 | 6 | 6 | 0 | 0 | 0 | 32.0 | 38 | 20 | 1 | 19 | 24 |
| Pedro Ibarra | 2028-2028 | 0 | 0 | .000 | 2.08 | 4 | 0 | 0 | 0 | 0 | 8.2 | 9 | 2 | 0 | 4 | 1 |
| Francisco Ibáñez | 2026-2027 | 2 | 1 | .667 | 4.97 | 37 | 0 | 0 | 0 | 2 | 70.2 | 64 | 39 | 7 | 46 | 66 |
| Ramón Icaza | 2028-2028 | 1 | 0 | 1.000 | 0.00 | 6 | 0 | 0 | 0 | 0 | 8.0 | 4 | 0 | 0 | 1 | 9 |
| Hiroshi Ichikawa | 2030-2031 | 11 | 21 | .344 | 5.09 | 56 | 56 | 0 | 0 | 0 | 252.2 | 269 | 143 | 29 | 98 | 189 |
| Bob Iddiols | 2023-2025 | 13 | 11 | .542 | 2.80 | 129 | 0 | 0 | 0 | 69 | 141.1 | 124 | 44 | 13 | 64 | 110 |
| Masamichi Iida | 2030-2031 | 8 | 7 | .533 | 5.58 | 78 | 0 | 0 | 0 | 4 | 132.1 | 142 | 82 | 18 | 92 | 98 |
| Taheiji Iida | 2028-2031 | 5 | 4 | .556 | 2.97 | 58 | 0 | 0 | 0 | 11 | 69.2 | 63 | 23 | 5 | 22 | 67 |
| Kiyonobu Iijima | 2030-2031 | 16 | 4 | .800 | 3.41 | 41 | 41 | 0 | 0 | 0 | 219.0 | 204 | 83 | 16 | 47 | 158 |
| Sumitomo Ikeda | 2031-2031 | 0 | 0 | .000 | 6.85 | 19 | 0 | 0 | 0 | 0 | 44.2 | 55 | 34 | 2 | 25 | 14 |
| Terumoto Ikeda | 2030-2031 | 9 | 5 | .643 | 3.17 | 25 | 25 | 0 | 0 | 0 | 125.0 | 114 | 44 | 9 | 29 | 111 |
| Dong-won Im | 2024-2029 | 15 | 22 | .405 | 5.01 | 119 | 29 | 0 | 0 | 9 | 233.1 | 252 | 130 | 19 | 86 | 150 |
| Min-su Im | 2031-2031 | 4 | 1 | .800 | 3.09 | 41 | 0 | 0 | 0 | 3 | 78.2 | 71 | 27 | 7 | 37 | 78 |
| Katsuhito Ine | 2023-2023 | 4 | 2 | .667 | 2.05 | 10 | 10 | 0 | 0 | 0 | 66.0 | 41 | 15 | 4 | 19 | 74 |
| Shusaku Ine | 2025-2027 | 5 | 33 | .132 | 10.34 | 97 | 39 | 0 | 0 | 0 | 215.0 | 304 | 247 | 14 | 244 | 139 |
| Yoshihito Ine | 2023-2024 | 9 | 4 | .692 | 4.30 | 40 | 6 | 0 | 0 | 0 | 81.2 | 83 | 39 | 4 | 38 | 77 |
| Ron Ingram | 2021-2021 | 3 | 2 | .600 | 3.68 | 5 | 5 | 1 | 1 | 0 | 29.1 | 26 | 12 | 2 | 12 | 26 |
| Kenkichi Inoue | 2024-2026 | 11 | 12 | .478 | 3.57 | 63 | 28 | 1 | 1 | 4 | 232.0 | 215 | 92 | 13 | 100 | 128 |
| Kiyohira Inoue | 2026-2030 | 14 | 20 | .412 | 5.19 | 56 | 56 | 0 | 0 | 0 | 308.2 | 333 | 178 | 29 | 144 | 218 |
| Kagehisa Ishikawa | 2030-2031 | 12 | 18 | .400 | 5.13 | 56 | 56 | 0 | 0 | 0 | 259.2 | 296 | 148 | 27 | 87 | 220 |
| Kuniyoshi Ishikawa | 2028-2030 | 2 | 1 | .667 | 5.55 | 48 | 1 | 0 | 0 | 1 | 97.1 | 113 | 60 | 10 | 55 | 76 |
| Atsushi Ito | 2023-2027 | 8 | 7 | .533 | 3.21 | 116 | 0 | 0 | 0 | 14 | 101.0 | 97 | 36 | 3 | 66 | 98 |
| Kata Ito | 2027-2029 | 5 | 3 | .625 | 4.04 | 72 | 0 | 0 | 0 | 3 | 156.0 | 164 | 70 | 16 | 40 | 125 |
| Shun Ito | 2031-2031 | 0 | 0 | .000 | 8.10 | 4 | 0 | 0 | 0 | 0 | 6.2 | 10 | 6 | 3 | 3 | 4 |
| Tsuneyo Ito | 2024-2026 | 7 | 25 | .219 | 3.85 | 118 | 0 | 0 | 0 | 50 | 126.1 | 152 | 54 | 6 | 66 | 75 |
| Hisashi Iwakuma | 2010-2011 | 16 | 11 | .593 | 4.82 | 38 | 38 | 0 | 0 | 0 | 194.1 | 247 | 104 | 13 | 69 | 139 |
| Felipe Izaguine | 2029-2031 | 8 | 11 | .421 | 3.83 | 107 | 0 | 0 | 0 | 60 | 112.2 | 93 | 48 | 13 | 87 | 117 |
