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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| José Ibarra | 2021-2024 | .316 | 44 | 130 | 0 | 0 | 0 | 0.00 | 0 |
| Kuma Ichihara | 2025-2027 | .245 | 7 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Yoshitoki Ichihara | 2015-2020 | .271 | 26 | 262 | 0 | 0 | 0 | 0.00 | 0 |
| Tsuramatsu Iijima | 2016-2026 | .291 | 16 | 165 | 0 | 0 | 0 | 0.00 | 0 |
| Yaichiro Iijima | 2027-2027 | .154 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Atsushi Iitsuka | 2024-2027 | .000 | 0 | 0 | 32 | 36 | 0 | 5.72 | 439 |
| Yasujiro Iitsuka | 2027-2027 | .269 | 8 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Kensaku Ikeda | 2022-2024 | .000 | 0 | 0 | 3 | 7 | 0 | 5.59 | 97 |
| Motonobu Ikeda | 2018-2021 | .262 | 32 | 116 | 0 | 0 | 0 | 0.00 | 0 |
| Noriyuki Ikeda | 2025-2026 | .000 | 0 | 0 | 6 | 5 | 0 | 3.64 | 105 |
| Shoichi Ikeda | 2027-2027 | .000 | 0 | 0 | 2 | 2 | 2 | 6.94 | 42 |
| Armando Ilharco | 2014-2015 | .277 | 9 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Kuniaki Imai | 2022-2027 | .000 | 0 | 0 | 4 | 3 | 14 | 2.76 | 61 |
| Kojuro Ine | 2026-2027 | .279 | 30 | 107 | 0 | 0 | 0 | 0.00 | 0 |
| Ryunosuke Ine | 2025-2027 | .000 | 0 | 0 | 2 | 0 | 0 | 8.57 | 35 |
| Yoriie Ine | 2018-2020 | .218 | 4 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Yoritomo Ine | 2019-2025 | .000 | 0 | 0 | 53 | 46 | 3 | 4.74 | 600 |
| Artashes Injeyan | 2024-2027 | .000 | 0 | 0 | 9 | 9 | 5 | 4.73 | 177 |
| Dennis Inman | 2022-2022 | .000 | 0 | 0 | 6 | 4 | 2 | 6.13 | 66 |
| Kamatari Inoue | 2018-2024 | .295 | 9 | 164 | 0 | 0 | 0 | 0.00 | 0 |
| Kyoichi Inoue | 2019-2021 | .667 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Ton Inoue | 2027-2027 | .333 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Yoshihiro Inoue | 2013-2020 | .309 | 31 | 201 | 0 | 0 | 0 | 0.00 | 0 |
| Monte Irvin | 2026-2027 | .261 | 17 | 94 | 0 | 0 | 0 | 0.00 | 0 |
| Makoto Ishida | 2025-2027 | .000 | 0 | 0 | 4 | 9 | 8 | 5.75 | 65 |
| Yeijiro Ishihara | 2022-2024 | .000 | 0 | 0 | 32 | 19 | 0 | 4.56 | 408 |
| Akio Ishii | 2025-2026 | .341 | 37 | 156 | 0 | 0 | 0 | 0.00 | 0 |
| Masatake Ishii | 2021-2027 | .291 | 71 | 309 | 0 | 0 | 0 | 0.00 | 0 |
| Osamu Ishii | 2025-2027 | .000 | 0 | 0 | 11 | 18 | 0 | 4.98 | 249 |
| Nobuhiko Ishikawa | 2024-2025 | .372 | 2 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Seb Ising | 2018-2018 | .000 | 0 | 0 | 0 | 0 | 0 | 1.04 | 5 |
| Ammar Isma'il | 2021-2024 | .000 | 0 | 0 | 11 | 5 | 1 | 5.52 | 187 |
| Mendel Israel | 2023-2027 | .285 | 49 | 182 | 0 | 0 | 0 | 0.00 | 0 |
| Akira Ito | 2019-2021 | .271 | 27 | 98 | 0 | 0 | 0 | 0.00 | 0 |
| Masahiko Ito | 2026-2026 | .188 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Nobuhisa Ito | 2026-2027 | .205 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Osamu Ito | 2015-2024 | .258 | 41 | 138 | 0 | 0 | 0 | 0.00 | 0 |
| Yasuhiko Ito | 2023-2027 | .000 | 0 | 0 | 11 | 4 | 0 | 3.85 | 109 |
| Yoshifumi Ito | 2020-2022 | .000 | 0 | 0 | 0 | 0 | 0 | 6.45 | 23 |
| Ken Ives | 2018-2020 | .000 | 0 | 0 | 1 | 0 | 0 | 5.59 | 77 |
| Kinnojo Iwamoto | 2023-2027 | .277 | 15 | 95 | 0 | 0 | 0 | 0.00 | 0 |
| Seiichi Iwamoto | 2020-2021 | .265 | 3 | 75 | 0 | 0 | 0 | 0.00 | 0 |
| Okakura Iwasaki | 2020-2022 | .000 | 0 | 0 | 11 | 13 | 0 | 4.83 | 188 |
| Toin Iwata | 2019-2027 | .257 | 73 | 256 | 0 | 0 | 0 | 0.00 | 0 |
