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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Adrián Ibáñez | 2018-2030 | 112 | 79 | .586 | 4.12 | 384 | 311 | 3 | 1 | 7 | 1868.0 | 1902 | 856 | 171 | 730 | 1363 |
| Ryutaro Iida | 2032-2033 | 10 | 6 | .625 | 4.56 | 127 | 0 | 0 | 0 | 4 | 142.0 | 165 | 72 | 16 | 42 | 123 |
| Munenori Ikarashi | 2015-2019 | 23 | 19 | .548 | 3.64 | 311 | 0 | 0 | 0 | 12 | 363.1 | 343 | 147 | 42 | 97 | 268 |
| Yasutoki Ikeda | 2023-2023 | 1 | 6 | .143 | 5.67 | 11 | 11 | 0 | 0 | 0 | 60.1 | 86 | 38 | 13 | 18 | 16 |
| Cheol-han Im | 2025-2033 | 30 | 43 | .411 | 6.50 | 461 | 21 | 0 | 0 | 41 | 531.2 | 713 | 384 | 74 | 272 | 293 |
| Shinsaku Ine | 2025-2029 | 1 | 1 | .500 | 13.50 | 16 | 0 | 0 | 0 | 0 | 17.1 | 36 | 26 | 1 | 11 | 7 |
| Kosaku Inoue | 2021-2022 | 0 | 0 | .000 | 0.00 | 3 | 0 | 0 | 0 | 0 | 3.1 | 3 | 0 | 0 | 1 | 3 |
| Satoshi Inoue | 2020-2022 | 0 | 0 | .000 | 33.00 | 5 | 0 | 0 | 0 | 0 | 3.0 | 14 | 11 | 0 | 4 | 0 |
| Paul Isham | 2015-2015 | 0 | 0 | .000 | 9.64 | 2 | 0 | 0 | 0 | 0 | 4.2 | 8 | 5 | 3 | 1 | 2 |
| Akinari Ishihara | 2022-2023 | 0 | 0 | .000 | 9.00 | 2 | 0 | 0 | 0 | 0 | 2.0 | 2 | 2 | 0 | 3 | 0 |
| Kazuhisa Ishii | 2002-2008 | 41 | 45 | .477 | 4.67 | 313 | 75 | 0 | 0 | 4 | 601.0 | 573 | 312 | 36 | 379 | 525 |
| Yukichi Ishikawa | 2013-2013 | 1 | 1 | .500 | 4.37 | 28 | 0 | 0 | 0 | 0 | 45.1 | 50 | 22 | 6 | 20 | 20 |
| Jason Isringhausen | 1995-2008 | 57 | 67 | .460 | 3.98 | 640 | 52 | 3 | 1 | 249 | 950.1 | 926 | 420 | 24 | 410 | 776 |
| Atsushi Ito | 2031-2033 | 4 | 9 | .308 | 4.24 | 170 | 2 | 0 | 0 | 13 | 187.0 | 185 | 88 | 27 | 80 | 94 |
| Okitsugu Ito | 2029-2033 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 1 | 0.2 | 0 | 0 | 0 | 0 | 0 |
| Toshikazu Ito | 2022-2022 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 2.0 | 1 | 0 | 0 | 2 | 1 |
| Beddis Iyapo | 2018-2020 | 0 | 0 | .000 | 7.47 | 8 | 0 | 0 | 0 | 0 | 15.2 | 23 | 13 | 3 | 22 | 5 |
