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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yoshikazu Ichihara | 2033-2033 | 1 | 2 | .333 | 6.06 | 19 | 1 | 0 | 0 | 0 | 35.2 | 43 | 24 | 8 | 5 | 19 |
| Atsushi Iitsuka | 2025-2033 | 19 | 17 | .528 | 4.33 | 168 | 24 | 0 | 0 | 18 | 351.1 | 363 | 169 | 44 | 128 | 285 |
| Izumo Ikarashi | 2033-2034 | 4 | 5 | .444 | 4.28 | 57 | 7 | 0 | 0 | 0 | 136.2 | 147 | 65 | 18 | 67 | 95 |
| Eiichi Ikeda | 2030-2034 | 5 | 6 | .455 | 4.25 | 62 | 1 | 0 | 0 | 2 | 125.0 | 136 | 59 | 14 | 39 | 79 |
| Noriyuki Ikeda | 2026-2034 | 67 | 63 | .515 | 4.57 | 224 | 178 | 0 | 0 | 4 | 1096.0 | 1133 | 557 | 115 | 424 | 851 |
| Kuniaki Imai | 2018-2029 | 42 | 39 | .519 | 3.68 | 591 | 12 | 0 | 0 | 86 | 736.0 | 744 | 301 | 83 | 204 | 603 |
| Shuichi Imai | 2034-2034 | 5 | 6 | .455 | 2.53 | 14 | 13 | 2 | 1 | 0 | 85.1 | 57 | 24 | 8 | 19 | 93 |
| Artashes Injeyan | 2032-2032 | 4 | 1 | .800 | 4.59 | 37 | 0 | 0 | 0 | 0 | 49.0 | 45 | 25 | 7 | 15 | 28 |
| Dennis Inman | 2012-2022 | 56 | 39 | .589 | 3.20 | 639 | 41 | 3 | 0 | 63 | 939.1 | 801 | 334 | 78 | 348 | 985 |
| Shojiro Inoue | 2027-2034 | 2 | 3 | .400 | 4.11 | 59 | 0 | 0 | 0 | 0 | 46.0 | 46 | 21 | 4 | 13 | 40 |
| Yeijiro Ishihara | 2024-2031 | 36 | 71 | .336 | 5.36 | 168 | 130 | 15 | 4 | 1 | 839.2 | 990 | 500 | 144 | 320 | 519 |
| Osamu Ishii | 2026-2029 | 2 | 1 | .667 | 5.16 | 47 | 0 | 0 | 0 | 2 | 61.0 | 76 | 35 | 11 | 33 | 59 |
| Mito Ishikawa | 2030-2034 | 8 | 18 | .308 | 5.48 | 66 | 27 | 2 | 0 | 4 | 212.0 | 263 | 129 | 29 | 106 | 101 |
| Yasuhiko Ito | 2023-2031 | 79 | 63 | .556 | 4.81 | 247 | 229 | 3 | 0 | 1 | 1388.1 | 1530 | 742 | 231 | 324 | 1034 |
| Okakura Iwasaki | 2021-2022 | 5 | 6 | .455 | 6.08 | 23 | 13 | 0 | 0 | 1 | 80.0 | 110 | 54 | 15 | 29 | 51 |
