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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Luis Ibarria | 2024-2024 | 0 | 0 | .000 | 39.00 | 1 | 0 | 0 | 0 | 0 | 3.0 | 9 | 13 | 3 | 6 | 0 |
| Matsudaira Iida | 2024-2024 | 9 | 5 | .643 | 5.51 | 21 | 20 | 0 | 0 | 0 | 129.0 | 162 | 79 | 22 | 41 | 58 |
| Naruhiko Iijima | 2038-2042 | 22 | 26 | .458 | 6.58 | 136 | 39 | 4 | 0 | 6 | 403.2 | 555 | 295 | 44 | 228 | 251 |
| Hideo Ikarashi | 2019-2026 | 17 | 31 | .354 | 9.53 | 324 | 5 | 3 | 0 | 51 | 395.2 | 511 | 419 | 91 | 359 | 372 |
| Matsuo Ikarashi | 2035-2035 | 5 | 6 | .455 | 5.90 | 20 | 14 | 1 | 0 | 0 | 105.1 | 126 | 69 | 30 | 43 | 86 |
| Tunay Ilker | 2039-2040 | 6 | 17 | .261 | 8.28 | 39 | 30 | 1 | 0 | 0 | 192.1 | 287 | 177 | 34 | 91 | 142 |
| Tadaaki Inagaki | 2024-2024 | 0 | 0 | .000 | 3.00 | 1 | 0 | 0 | 0 | 0 | 3.0 | 4 | 1 | 0 | 2 | 0 |
| Gabriel Ingle | 2018-2019 | 5 | 11 | .313 | 9.24 | 22 | 20 | 0 | 0 | 0 | 112.0 | 157 | 115 | 10 | 104 | 62 |
| Ienobu Inoue | 2033-2033 | 0 | 1 | .000 | 15.12 | 4 | 1 | 0 | 0 | 0 | 8.1 | 23 | 14 | 3 | 9 | 4 |
| Mito Inoue | 2019-2031 | 29 | 38 | .433 | 6.86 | 202 | 79 | 0 | 0 | 21 | 613.0 | 753 | 467 | 76 | 490 | 518 |
| Okitsugu Inoue | 2018-2018 | 0 | 2 | .000 | 2.14 | 8 | 3 | 0 | 0 | 0 | 21.0 | 26 | 5 | 1 | 5 | 10 |
| Filippo Ioli | 2028-2028 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 |
| Trent Isham | 2028-2030 | 21 | 14 | .600 | 5.35 | 76 | 39 | 9 | 2 | 3 | 340.0 | 370 | 202 | 59 | 133 | 257 |
| Kazuo Ishihara | 2036-2037 | 10 | 18 | .357 | 5.63 | 65 | 24 | 1 | 0 | 2 | 225.1 | 269 | 141 | 35 | 91 | 180 |
| Yasuyuki Ishikawa | 2033-2035 | 13 | 14 | .481 | 5.82 | 44 | 44 | 0 | 0 | 0 | 233.2 | 271 | 151 | 19 | 134 | 190 |
| Kunihiko Ito | 2022-2022 | 0 | 0 | .000 | 91.80 | 1 | 0 | 0 | 0 | 0 | 1.2 | 13 | 17 | 2 | 6 | 0 |
| Masahiro Ito | 2019-2019 | 0 | 0 | .000 | 6.75 | 2 | 0 | 0 | 0 | 0 | 1.1 | 2 | 1 | 0 | 1 | 0 |
| Shunso Ito | 2028-2029 | 1 | 3 | .250 | 7.43 | 8 | 7 | 0 | 0 | 0 | 36.1 | 55 | 30 | 7 | 23 | 19 |
| Lorenzo Iuliano | 2029-2030 | 9 | 14 | .391 | 5.04 | 32 | 30 | 3 | 0 | 0 | 185.2 | 193 | 104 | 19 | 113 | 122 |
