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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 | 2025-2025 | .368 | 14 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Rodrigo Ibarra | 2022-2022 | .167 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Kuma Ichihara | 2025-2026 | .259 | 3 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Yachi Ichihara | 2025-2027 | .219 | 14 | 70 | 0 | 0 | 0 | 0.00 | 0 |
| Yoshiiku Ichihara | 2024-2025 | .000 | 0 | 0 | 1 | 2 | 0 | 8.65 | 32 |
| Yoshitoki Ichihara | 2014-2014 | .308 | 4 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Katsuhiko Ichikawa | 2020-2020 | .000 | 0 | 0 | 3 | 2 | 1 | 7.55 | 31 |
| Tsuneyo Ichikawa | 2026-2027 | .000 | 0 | 0 | 1 | 1 | 2 | 6.42 | 62 |
| Shigochiyo Iida | 2020-2022 | .209 | 1 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Tsuramatsu Iijima | 2015-2023 | .251 | 13 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Yaichiro Iijima | 2025-2027 | .193 | 2 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Atsushi Iitsuka | 2023-2025 | .000 | 0 | 0 | 10 | 11 | 2 | 6.84 | 104 |
| Yasujiro Iitsuka | 2027-2027 | .246 | 2 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Eiichi Ikeda | 2027-2027 | .000 | 0 | 0 | 0 | 2 | 0 | 4.20 | 18 |
| Isei Ikeda | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Kensaku Ikeda | 2021-2027 | .000 | 0 | 0 | 4 | 10 | 2 | 5.99 | 102 |
| Motonobu Ikeda | 2017-2018 | .304 | 27 | 79 | 0 | 0 | 0 | 0.00 | 0 |
| Natsuo Ikeda | 2025-2027 | .234 | 6 | 71 | 0 | 0 | 0 | 0.00 | 0 |
| Noriyuki Ikeda | 2024-2026 | .000 | 0 | 0 | 14 | 10 | 0 | 3.55 | 303 |
| Shoichi Ikeda | 2026-2027 | .000 | 0 | 0 | 13 | 20 | 0 | 4.51 | 230 |
| Ukessun Ilaes | 2027-2027 | .000 | 0 | 0 | 6 | 2 | 1 | 2.49 | 77 |
| Edward Ilett | 2027-2027 | .195 | 1 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Armando Ilharco | 2016-2019 | .216 | 4 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Kuniaki Imai | 2016-2017 | .000 | 0 | 0 | 7 | 8 | 47 | 3.08 | 94 |
| Takahashi Imai | 2023-2023 | .000 | 0 | 0 | 2 | 1 | 1 | 2.18 | 14 |
| Hideyoshi Ine | 2018-2024 | .272 | 100 | 406 | 0 | 0 | 0 | 0.00 | 0 |
| Junnosuke Ine | 2022-2023 | .000 | 0 | 0 | 0 | 0 | 1 | 11.25 | 15 |
| Kojuro Ine | 2024-2026 | .264 | 30 | 156 | 0 | 0 | 0 | 0.00 | 0 |
| Noriaki Ine | 2027-2027 | .000 | 0 | 0 | 1 | 5 | 16 | 3.34 | 33 |
| Ryunosuke Ine | 2025-2027 | .000 | 0 | 0 | 17 | 14 | 1 | 5.70 | 203 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Shimei Ine | 2020-2020 | .000 | 0 | 0 | 0 | 2 | 0 | 18.47 | 7 |
| Yoriie Ine | 2017-2020 | .249 | 26 | 132 | 0 | 0 | 0 | 0.00 | 0 |
| Yoritomo Ine | 2018-2019 | .000 | 0 | 0 | 20 | 12 | 0 | 3.33 | 221 |
| Artashes Injeyan | 2020-2023 | .000 | 0 | 0 | 18 | 10 | 12 | 4.33 | 291 |
| Kamatari Inoue | 2020-2026 | .349 | 7 | 63 | 0 | 0 | 0 | 0.00 | 0 |
| Ken'ichi Inoue | 2020-2022 | .282 | 1 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Kyoichi Inoue | 2019-2021 | .245 | 7 | 67 | 0 | 0 | 0 | 0.00 | 0 |
| Nakamaro Inoue | 2021-2021 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Shojiro Inoue | 2024-2027 | .000 | 0 | 0 | 7 | 2 | 25 | 2.37 | 89 |
| Ton Inoue | 2024-2027 | .264 | 23 | 157 | 0 | 0 | 0 | 0.00 | 0 |
| Yoshihiro Inoue | 2016-2016 | .266 | 7 | 50 | 0 | 0 | 0 | 40.50 | 0 |
| Justin Irvin | 2023-2025 | .000 | 0 | 0 | 0 | 6 | 1 | 6.84 | 71 |
| Monte Irvin | 2024-2026 | .282 | 38 | 178 | 0 | 0 | 0 | 0.00 | 0 |
| Kojiro Ishibashi | 2025-2027 | .263 | 0 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Makoto Ishida | 2024-2027 | .000 | 0 | 0 | 6 | 7 | 7 | 5.52 | 92 |
| Yeijiro Ishihara | 2021-2022 | .000 | 0 | 0 | 15 | 12 | 0 | 5.31 | 177 |
| Akio Ishii | 2026-2026 | .390 | 5 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Masatake Ishii | 2019-2026 | .298 | 41 | 190 | 0 | 0 | 0 | 0.00 | 0 |
| Osamu Ishii | 2023-2027 | .000 | 0 | 0 | 8 | 16 | 0 | 4.41 | 188 |
| Hoshi Ishikawa | 2027-2027 | .212 | 2 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Nobuhiko Ishikawa | 2023-2024 | .289 | 3 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Takayuki Ishikawa | 2027-2027 | .300 | 13 | 57 | 0 | 0 | 0 | 0.00 | 0 |
| Seb Ising | 2018-2020 | .000 | 0 | 0 | 3 | 3 | 0 | 4.20 | 70 |
| Ammar Isma'il | 2019-2023 | .000 | 0 | 0 | 16 | 10 | 1 | 5.32 | 251 |
| Mendel Israel | 2020-2023 | .227 | 43 | 261 | 0 | 0 | 0 | 0.00 | 0 |
| Hughie Isted | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Akira Ito | 2019-2021 | .347 | 5 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Masahiko Ito | 2025-2027 | .143 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Nobuhisa Ito | 2026-2027 | .316 | 6 | 81 | 0 | 0 | 0 | 0.00 | 0 |
| Osamu Ito | 2015-2022 | .247 | 7 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Yoshifumi Ito | 2017-2022 | .000 | 0 | 0 | 7 | 13 | 33 | 3.83 | 204 |
| Ken Ives | 2016-2020 | .000 | 0 | 0 | 9 | 6 | 5 | 4.73 | 198 |
| Kyle Ivory | 2027-2027 | .500 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Kinnojo Iwamoto | 2021-2027 | .254 | 14 | 94 | 0 | 0 | 0 | 0.00 | 0 |
| Norishige Iwamoto | 2026-2027 | .277 | 0 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Seiichi Iwamoto | 2018-2020 | .275 | 7 | 71 | 0 | 0 | 0 | 0.00 | 0 |
| Junzo Iwasaki | 2026-2027 | .240 | 0 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Okakura Iwasaki | 2018-2020 | .000 | 0 | 0 | 17 | 12 | 0 | 5.38 | 218 |
| Toin Iwata | 2016-2019 | .246 | 15 | 82 | 0 | 0 | 0 | 0.00 | 0 |
