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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 | 2031-2032 | 2 | 6 | .250 | 5.95 | 18 | 14 | 0 | 0 | 0 | 75.2 | 99 | 50 | 10 | 45 | 30 |
| Atsushi Iitsuka | 2024-2032 | 36 | 43 | .456 | 5.46 | 127 | 109 | 0 | 0 | 5 | 613.1 | 684 | 372 | 75 | 308 | 539 |
| Izumo Ikarashi | 2028-2032 | 5 | 2 | .714 | 4.08 | 78 | 0 | 0 | 0 | 8 | 92.2 | 96 | 42 | 8 | 49 | 62 |
| Eiichi Ikeda | 2030-2032 | 5 | 10 | .333 | 5.74 | 96 | 22 | 0 | 0 | 10 | 194.1 | 255 | 124 | 24 | 52 | 128 |
| Kensaku Ikeda | 2022-2028 | 4 | 9 | .308 | 5.50 | 112 | 5 | 0 | 0 | 0 | 106.1 | 113 | 65 | 15 | 82 | 106 |
| Noriyuki Ikeda | 2025-2026 | 6 | 5 | .545 | 3.64 | 16 | 16 | 0 | 0 | 0 | 81.2 | 76 | 33 | 3 | 42 | 105 |
| Shoichi Ikeda | 2027-2032 | 10 | 16 | .385 | 6.74 | 78 | 30 | 0 | 0 | 3 | 239.0 | 306 | 179 | 45 | 109 | 197 |
| Kuniaki Imai | 2022-2027 | 4 | 3 | .571 | 2.76 | 72 | 0 | 0 | 0 | 14 | 62.0 | 50 | 19 | 8 | 16 | 61 |
| Shuichi Imai | 2032-2032 | 4 | 9 | .308 | 3.68 | 33 | 33 | 0 | 0 | 0 | 156.2 | 133 | 64 | 12 | 67 | 173 |
| Noriaki Ine | 2030-2031 | 5 | 3 | .625 | 9.82 | 47 | 0 | 0 | 0 | 0 | 91.2 | 138 | 100 | 12 | 86 | 71 |
| Ryunosuke Ine | 2025-2031 | 4 | 4 | .500 | 6.11 | 95 | 6 | 0 | 0 | 1 | 95.2 | 115 | 65 | 13 | 54 | 84 |
| Yoritomo Ine | 2019-2025 | 53 | 46 | .535 | 4.74 | 178 | 141 | 5 | 3 | 3 | 904.2 | 944 | 476 | 68 | 435 | 600 |
| Artashes Injeyan | 2024-2032 | 28 | 27 | .509 | 4.53 | 458 | 0 | 0 | 0 | 65 | 459.0 | 470 | 231 | 41 | 218 | 467 |
| Dennis Inman | 2022-2022 | 6 | 4 | .600 | 6.13 | 72 | 0 | 0 | 0 | 2 | 69.0 | 93 | 47 | 6 | 22 | 66 |
| Shojiro Inoue | 2028-2032 | 10 | 9 | .526 | 4.25 | 117 | 0 | 0 | 0 | 8 | 106.0 | 120 | 50 | 8 | 53 | 100 |
| Makoto Ishida | 2025-2027 | 4 | 9 | .308 | 5.75 | 94 | 0 | 0 | 0 | 8 | 119.0 | 139 | 76 | 6 | 82 | 65 |
| Yeijiro Ishihara | 2022-2032 | 48 | 26 | .649 | 4.33 | 107 | 104 | 2 | 1 | 0 | 629.1 | 635 | 303 | 76 | 297 | 555 |
| Osamu Ishii | 2025-2029 | 12 | 24 | .333 | 4.90 | 99 | 77 | 0 | 0 | 0 | 295.2 | 310 | 161 | 43 | 138 | 318 |
| Mito Ishikawa | 2028-2031 | 26 | 26 | .500 | 4.73 | 80 | 80 | 1 | 0 | 0 | 429.2 | 461 | 226 | 43 | 220 | 373 |
| 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 | 2023-2032 | 15 | 7 | .682 | 3.23 | 29 | 28 | 1 | 0 | 0 | 167.0 | 145 | 60 | 18 | 50 | 153 |
| 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 |
