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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tetsuzan Ichihara | 2026-2027 | 0 | 1 | .000 | 2.82 | 16 | 0 | 0 | 0 | 3 | 22.1 | 20 | 7 | 0 | 5 | 22 |
| Yoshiiku Ichihara | 2023-2024 | 4 | 13 | .235 | 5.79 | 44 | 27 | 0 | 0 | 8 | 146.0 | 171 | 94 | 10 | 87 | 130 |
| Yoshikazu Ichihara | 2027-2027 | 3 | 2 | .600 | 1.83 | 39 | 0 | 0 | 0 | 20 | 39.1 | 26 | 8 | 3 | 19 | 37 |
| Katsuhiko Ichikawa | 2015-2019 | 17 | 12 | .586 | 4.70 | 174 | 18 | 0 | 0 | 3 | 341.0 | 362 | 178 | 35 | 159 | 328 |
| Tsuneyo Ichikawa | 2025-2026 | 1 | 0 | 1.000 | 3.29 | 50 | 0 | 0 | 0 | 0 | 82.0 | 76 | 30 | 3 | 38 | 96 |
| Atsushi Iitsuka | 2022-2022 | 6 | 6 | .500 | 6.03 | 21 | 21 | 0 | 0 | 0 | 118.0 | 138 | 79 | 13 | 55 | 99 |
| Eiichi Ikeda | 2026-2027 | 14 | 10 | .583 | 3.07 | 78 | 26 | 1 | 1 | 20 | 199.2 | 170 | 68 | 9 | 64 | 225 |
| Hidemichi Ikeda | 2025-2027 | 0 | 1 | .000 | 6.20 | 37 | 0 | 0 | 0 | 4 | 61.0 | 55 | 42 | 10 | 44 | 64 |
| Kensaku Ikeda | 2020-2027 | 7 | 6 | .538 | 4.57 | 176 | 6 | 0 | 0 | 1 | 134.0 | 138 | 68 | 6 | 75 | 164 |
| Noriyuki Ikeda | 2021-2024 | 7 | 2 | .778 | 3.26 | 32 | 12 | 0 | 0 | 0 | 105.0 | 81 | 38 | 7 | 54 | 156 |
| Shoichi Ikeda | 2025-2025 | 6 | 10 | .375 | 4.31 | 24 | 24 | 1 | 1 | 0 | 129.1 | 148 | 62 | 11 | 39 | 133 |
| Ukessun Ilaes | 2026-2026 | 7 | 3 | .700 | 2.60 | 18 | 18 | 0 | 0 | 0 | 97.0 | 76 | 28 | 6 | 39 | 136 |
| Dong-hee Im | 2024-2024 | 1 | 0 | 1.000 | 3.51 | 12 | 0 | 0 | 0 | 1 | 25.2 | 23 | 10 | 2 | 19 | 22 |
| Kuniaki Imai | 2014-2027 | 4 | 0 | 1.000 | 2.69 | 56 | 0 | 0 | 0 | 0 | 67.0 | 42 | 20 | 4 | 31 | 78 |
| Takahashi Imai | 2023-2024 | 8 | 7 | .533 | 4.06 | 35 | 35 | 0 | 0 | 0 | 179.2 | 172 | 81 | 16 | 80 | 204 |
| Yorikane Imamura | 2024-2024 | 0 | 0 | .000 | 7.00 | 10 | 0 | 0 | 0 | 0 | 18.0 | 21 | 14 | 2 | 14 | 18 |
| Junnosuke Ine | 2021-2023 | 8 | 30 | .211 | 8.31 | 86 | 43 | 0 | 0 | 0 | 268.2 | 367 | 248 | 34 | 200 | 216 |
| Mitsuo Ine | 2018-2021 | 20 | 27 | .426 | 6.26 | 91 | 73 | 0 | 0 | 2 | 408.1 | 479 | 284 | 41 | 236 | 427 |
| Ryunosuke Ine | 2024-2027 | 18 | 16 | .529 | 3.32 | 64 | 50 | 0 | 0 | 0 | 300.2 | 271 | 111 | 29 | 89 | 325 |
| Sekien Ine | 2026-2026 | 0 | 0 | .000 | 11.25 | 2 | 0 | 0 | 0 | 0 | 4.0 | 7 | 5 | 0 | 4 | 6 |
| Shimei Ine | 2020-2022 | 1 | 3 | .250 | 5.84 | 23 | 10 | 0 | 0 | 0 | 69.1 | 82 | 45 | 10 | 38 | 93 |
| Yoritomo Ine | 2017-2017 | 5 | 5 | .500 | 4.39 | 17 | 17 | 0 | 0 | 0 | 94.1 | 96 | 46 | 9 | 35 | 100 |
| Artashes Injeyan | 2019-2025 | 10 | 4 | .714 | 2.80 | 105 | 0 | 0 | 0 | 19 | 132.0 | 116 | 41 | 10 | 45 | 155 |
| Dennis Inman | 2018-2018 | 0 | 0 | .000 | 1.02 | 13 | 0 | 0 | 0 | 2 | 17.2 | 9 | 2 | 0 | 8 | 32 |
| Shojiro Inoue | 2024-2026 | 10 | 12 | .455 | 3.42 | 169 | 0 | 0 | 0 | 90 | 168.1 | 134 | 64 | 19 | 75 | 211 |
| Takahiro Inoue | 2023-2024 | 4 | 34 | .105 | 8.65 | 49 | 49 | 0 | 0 | 0 | 204.0 | 309 | 196 | 20 | 145 | 164 |
| Justin Irvin | 2021-2023 | 7 | 10 | .412 | 4.84 | 44 | 26 | 0 | 0 | 2 | 178.2 | 190 | 96 | 15 | 78 | 180 |
| Kotaro Ishida | 2021-2021 | 1 | 0 | 1.000 | 6.62 | 22 | 0 | 0 | 0 | 1 | 34.0 | 47 | 25 | 4 | 22 | 26 |
| Makoto Ishida | 2023-2025 | 7 | 5 | .583 | 4.11 | 65 | 17 | 0 | 0 | 4 | 170.2 | 158 | 78 | 13 | 83 | 162 |
| Yeijiro Ishihara | 2020-2021 | 7 | 9 | .438 | 4.23 | 29 | 28 | 0 | 0 | 0 | 153.1 | 153 | 72 | 10 | 80 | 171 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Osamu Ishii | 2023-2027 | 3 | 23 | .115 | 5.85 | 37 | 30 | 1 | 0 | 0 | 161.2 | 186 | 105 | 16 | 102 | 149 |
| Mito Ishikawa | 2026-2027 | 16 | 18 | .471 | 4.31 | 45 | 44 | 0 | 0 | 0 | 217.0 | 197 | 104 | 21 | 99 | 247 |
| Yoshiyuki Ishikawa | 2025-2026 | 2 | 10 | .167 | 6.96 | 28 | 18 | 0 | 0 | 0 | 98.1 | 126 | 76 | 8 | 61 | 98 |
| Seb Ising | 2014-2017 | 5 | 2 | .714 | 4.37 | 65 | 1 | 0 | 0 | 4 | 90.2 | 106 | 44 | 7 | 54 | 66 |
| Ammar Isma'il | 2018-2020 | 24 | 14 | .632 | 4.92 | 61 | 61 | 0 | 0 | 0 | 316.2 | 353 | 173 | 21 | 155 | 334 |
| Josuke Ito | 2024-2024 | 3 | 2 | .600 | 4.75 | 20 | 0 | 0 | 0 | 0 | 36.0 | 40 | 19 | 4 | 25 | 25 |
| Kenji Ito | 2027-2027 | 0 | 0 | .000 | 6.00 | 4 | 1 | 0 | 0 | 0 | 6.0 | 7 | 4 | 1 | 2 | 6 |
| Kuniyuki Ito | 2027-2027 | 0 | 0 | .000 | 1.23 | 4 | 0 | 0 | 0 | 1 | 7.1 | 4 | 1 | 1 | 4 | 8 |
| Takahiro Ito | 2022-2022 | 1 | 0 | 1.000 | 6.23 | 12 | 0 | 0 | 0 | 0 | 26.0 | 34 | 18 | 1 | 25 | 20 |
| Yoshifumi Ito | 2017-2017 | 5 | 2 | .714 | 2.12 | 47 | 0 | 0 | 0 | 3 | 59.1 | 41 | 14 | 2 | 27 | 59 |
| Yvan Iuliano | 2020-2020 | 0 | 0 | .000 | 5.50 | 8 | 0 | 0 | 0 | 0 | 18.0 | 20 | 11 | 3 | 8 | 15 |
| Ken Ives | 2013-2017 | 7 | 9 | .438 | 3.98 | 156 | 0 | 0 | 0 | 13 | 158.1 | 137 | 70 | 11 | 107 | 213 |
| Ethan Ivory | 2027-2027 | 5 | 3 | .625 | 4.40 | 50 | 0 | 0 | 0 | 4 | 73.2 | 65 | 36 | 6 | 48 | 86 |
| Okakura Iwasaki | 2017-2018 | 19 | 8 | .704 | 4.15 | 43 | 43 | 0 | 0 | 0 | 236.2 | 248 | 109 | 18 | 89 | 192 |
