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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Atsushi Iitsuka | 2024-2027 | 32 | 36 | .471 | 5.72 | 97 | 96 | 0 | 0 | 0 | 520.2 | 606 | 331 | 68 | 279 | 439 |
| Kensaku Ikeda | 2022-2024 | 3 | 7 | .300 | 5.59 | 75 | 5 | 0 | 0 | 0 | 95.0 | 100 | 59 | 12 | 75 | 97 |
| Noriyuki Ikeda | 2025-2026 | 6 | 5 | .545 | 3.64 | 16 | 16 | 0 | 0 | 0 | 81.2 | 76 | 33 | 3 | 42 | 105 |
| Shoichi Ikeda | 2027-2027 | 2 | 2 | .500 | 6.94 | 28 | 0 | 0 | 0 | 2 | 48.0 | 56 | 37 | 7 | 25 | 42 |
| Kuniaki Imai | 2022-2027 | 4 | 3 | .571 | 2.76 | 72 | 0 | 0 | 0 | 14 | 62.0 | 50 | 19 | 8 | 16 | 61 |
| Ryunosuke Ine | 2025-2027 | 2 | 0 | 1.000 | 8.57 | 12 | 6 | 0 | 0 | 0 | 42.0 | 59 | 40 | 9 | 34 | 35 |
| Yoritomo Ine | 2019-2025 | 53 | 46 | .535 | 4.74 | 178 | 141 | 5 | 3 | 3 | 904.2 | 944 | 476 | 68 | 435 | 600 |
| Artashes Injeyan | 2024-2027 | 9 | 9 | .500 | 4.73 | 159 | 0 | 0 | 0 | 5 | 177.0 | 190 | 93 | 16 | 86 | 177 |
| Dennis Inman | 2022-2022 | 6 | 4 | .600 | 6.13 | 72 | 0 | 0 | 0 | 2 | 69.0 | 93 | 47 | 6 | 22 | 66 |
| Makoto Ishida | 2025-2027 | 4 | 9 | .308 | 5.75 | 94 | 0 | 0 | 0 | 8 | 119.0 | 139 | 76 | 6 | 82 | 65 |
| Yeijiro Ishihara | 2022-2024 | 32 | 19 | .627 | 4.56 | 72 | 72 | 2 | 1 | 0 | 438.1 | 446 | 222 | 57 | 218 | 408 |
| Osamu Ishii | 2025-2027 | 11 | 18 | .379 | 4.98 | 65 | 43 | 0 | 0 | 0 | 224.0 | 237 | 124 | 30 | 111 | 249 |
| Seb Ising | 2018-2018 | 0 | 0 | .000 | 1.04 | 3 | 0 | 0 | 0 | 0 | 8.2 | 3 | 1 | 0 | 5 | 5 |
| Ammar Isma'il | 2021-2024 | 11 | 5 | .688 | 5.52 | 91 | 13 | 1 | 0 | 1 | 189.0 | 203 | 116 | 30 | 119 | 187 |
| Yasuhiko Ito | 2023-2027 | 11 | 4 | .733 | 3.85 | 21 | 20 | 1 | 0 | 0 | 117.0 | 108 | 50 | 16 | 35 | 109 |
| Yoshifumi Ito | 2020-2022 | 0 | 0 | .000 | 6.45 | 26 | 0 | 0 | 0 | 0 | 37.2 | 49 | 27 | 6 | 23 | 23 |
| Ken Ives | 2018-2020 | 1 | 0 | 1.000 | 5.59 | 37 | 0 | 0 | 0 | 0 | 66.0 | 75 | 41 | 8 | 42 | 77 |
| Okakura Iwasaki | 2020-2022 | 11 | 13 | .458 | 4.83 | 49 | 42 | 1 | 0 | 0 | 253.2 | 275 | 136 | 34 | 104 | 188 |
