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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 | 2031-2033 | 7 | 12 | .368 | 5.21 | 45 | 19 | 0 | 0 | 5 | 131.1 | 152 | 76 | 15 | 78 | 71 |
| Atsushi Iitsuka | 2024-2033 | 36 | 43 | .456 | 5.45 | 128 | 109 | 0 | 0 | 5 | 614.0 | 685 | 372 | 75 | 308 | 541 |
| Izumo Ikarashi | 2028-2033 | 8 | 4 | .667 | 3.37 | 124 | 2 | 0 | 0 | 10 | 168.1 | 165 | 63 | 14 | 74 | 119 |
| 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 | 2025-2033 | 8 | 5 | .615 | 3.33 | 19 | 19 | 0 | 0 | 0 | 100.0 | 89 | 37 | 6 | 47 | 125 |
| 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 | 2032-2033 | 13 | 14 | .481 | 3.19 | 61 | 61 | 0 | 0 | 0 | 304.1 | 244 | 108 | 22 | 131 | 359 |
| 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 | 2024-2033 | 35 | 31 | .530 | 4.75 | 535 | 0 | 0 | 0 | 65 | 531.0 | 558 | 280 | 47 | 249 | 520 |
| Dennis Inman | 2022-2022 | 6 | 4 | .600 | 6.13 | 72 | 0 | 0 | 0 | 2 | 69.0 | 93 | 47 | 6 | 22 | 66 |
| Shojiro Inoue | 2028-2033 | 13 | 16 | .448 | 4.07 | 141 | 11 | 0 | 0 | 9 | 185.2 | 214 | 84 | 14 | 79 | 163 |
| Makoto Ishida | 2025-2027 | 4 | 9 | .308 | 5.75 | 94 | 0 | 0 | 0 | 8 | 119.0 | 139 | 76 | 6 | 82 | 65 |
| Yeijiro Ishihara | 2022-2033 | 52 | 34 | .605 | 4.41 | 130 | 127 | 3 | 2 | 0 | 735.1 | 777 | 360 | 87 | 338 | 634 |
| Osamu Ishii | 2025-2029 | 12 | 24 | .333 | 4.90 | 99 | 77 | 0 | 0 | 0 | 295.2 | 310 | 161 | 43 | 138 | 318 |
| Mito Ishikawa | 2028-2033 | 26 | 27 | .491 | 4.80 | 82 | 82 | 1 | 0 | 0 | 436.2 | 472 | 233 | 44 | 223 | 376 |
| 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 |
| Kenji Ito | 2033-2033 | 1 | 0 | 1.000 | 9.82 | 5 | 0 | 0 | 0 | 0 | 7.1 | 11 | 8 | 0 | 4 | 3 |
| Yasuhiko Ito | 2023-2033 | 16 | 10 | .615 | 3.64 | 36 | 28 | 1 | 0 | 0 | 175.2 | 160 | 71 | 22 | 58 | 156 |
| 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 |
