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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Shichiro Iba | 2037-2047 | 64 | 52 | .552 | 4.08 | 521 | 1 | 1 | 0 | 102 | 851.2 | 766 | 386 | 137 | 326 | 1037 |
| Yoshikazu Ichihara | 2033-2033 | 1 | 2 | .333 | 6.06 | 19 | 1 | 0 | 0 | 0 | 35.2 | 43 | 24 | 8 | 5 | 19 |
| Colt Idler | 2046-2047 | 4 | 7 | .364 | 5.08 | 27 | 9 | 2 | 1 | 0 | 102.2 | 108 | 58 | 21 | 37 | 72 |
| Atsushi Iitsuka | 2025-2033 | 19 | 17 | .528 | 4.33 | 168 | 24 | 0 | 0 | 18 | 351.1 | 363 | 169 | 44 | 128 | 285 |
| Izumo Ikarashi | 2033-2041 | 40 | 41 | .494 | 5.38 | 219 | 80 | 8 | 0 | 9 | 820.2 | 1011 | 491 | 131 | 271 | 484 |
| Eiichi Ikeda | 2030-2035 | 6 | 7 | .462 | 4.88 | 100 | 1 | 0 | 0 | 2 | 186.1 | 207 | 101 | 23 | 57 | 120 |
| Noriyuki Ikeda | 2026-2034 | 67 | 63 | .515 | 4.57 | 224 | 178 | 0 | 0 | 4 | 1096.0 | 1133 | 557 | 115 | 424 | 851 |
| Mitsuya Ikuta | 2049-2050 | 0 | 1 | .000 | 3.99 | 23 | 0 | 0 | 0 | 0 | 38.1 | 27 | 17 | 5 | 24 | 36 |
| Kuniaki Imai | 2018-2029 | 42 | 39 | .519 | 3.68 | 591 | 12 | 0 | 0 | 86 | 736.0 | 744 | 301 | 83 | 204 | 603 |
| Shuichi Imai | 2034-2044 | 125 | 77 | .619 | 3.79 | 301 | 290 | 14 | 9 | 0 | 1805.2 | 1578 | 761 | 280 | 386 | 1880 |
| 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 |
| Gabe Inoa | 2038-2042 | 10 | 16 | .385 | 5.32 | 147 | 2 | 0 | 0 | 10 | 255.2 | 269 | 151 | 58 | 155 | 283 |
| Shojiro Inoue | 2027-2036 | 2 | 4 | .333 | 4.53 | 63 | 0 | 0 | 0 | 0 | 47.2 | 47 | 24 | 5 | 15 | 43 |
| Edward Irizarry | 2052-2057 | 26 | 31 | .456 | 3.95 | 176 | 46 | 1 | 1 | 4 | 531.0 | 447 | 233 | 88 | 169 | 649 |
| Akanori Ishida | 2053-2053 | 0 | 0 | .000 | 2.02 | 5 | 0 | 0 | 0 | 0 | 13.1 | 8 | 3 | 2 | 5 | 23 |
| 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 |
| Tyler Ison | 2047-2048 | 4 | 4 | .500 | 3.78 | 40 | 0 | 0 | 0 | 3 | 64.1 | 55 | 27 | 8 | 26 | 66 |
| 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 |
