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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| Adrián Ibáñez | 2018-2030 | .137 | 0 | 25 | 112 | 79 | 7 | 4.12 | 1363 |
| José Ibarra | 2012-2022 | .228 | 49 | 288 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Ibarra | 2031-2031 | 1.000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| José Icaza | 2025-2031 | .280 | 3 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Yoshiteru Ichikawa | 2021-2021 | .308 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Ryutaro Iida | 2032-2033 | .000 | 0 | 0 | 10 | 6 | 4 | 4.56 | 123 |
| Munenori Ikarashi | 2015-2019 | .125 | 0 | 0 | 23 | 19 | 12 | 3.64 | 268 |
| Yasutoki Ikeda | 2023-2023 | .222 | 0 | 0 | 1 | 6 | 0 | 5.67 | 16 |
| Cheol-han Im | 2025-2033 | .119 | 0 | 6 | 30 | 43 | 41 | 6.50 | 293 |
| Hyeon-san Im | 2014-2020 | .227 | 4 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Shinsaku Ine | 2025-2029 | .000 | 0 | 0 | 1 | 1 | 0 | 13.50 | 7 |
| Shohei Ine | 2013-2013 | .250 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Kosaku Inoue | 2021-2022 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 3 |
| Satoshi Inoue | 2020-2022 | .000 | 0 | 0 | 0 | 0 | 0 | 33.00 | 0 |
| Sosuke Inoue | 2025-2025 | .238 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Paul Isham | 2015-2015 | .000 | 0 | 0 | 0 | 0 | 0 | 9.64 | 2 |
| Akinari Ishihara | 2022-2023 | .000 | 0 | 0 | 0 | 0 | 0 | 9.00 | 0 |
| Kazuhisa Ishii | 2002-2008 | .070 | 0 | 4 | 41 | 45 | 4 | 4.67 | 525 |
| Yoshitomo Ishii | 2023-2033 | .323 | 107 | 449 | 0 | 0 | 0 | 0.00 | 0 |
| Travis Ishikawa | 2008-2011 | .285 | 53 | 226 | 0 | 0 | 0 | 0.00 | 0 |
| Yukichi Ishikawa | 2013-2013 | .000 | 0 | 0 | 1 | 1 | 0 | 4.37 | 20 |
| Jason Isringhausen | 1995-2008 | .182 | 2 | 11 | 57 | 67 | 249 | 3.98 | 776 |
| Atsushi Ito | 2031-2033 | .091 | 0 | 0 | 4 | 9 | 13 | 4.24 | 94 |
| Hiroshi Ito | 2011-2014 | .176 | 1 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Okitsugu Ito | 2029-2033 | .343 | 114 | 356 | 0 | 0 | 1 | 0.00 | 0 |
| Toshikazu Ito | 2022-2022 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 1 |
| Bob Ivey | 2022-2030 | .278 | 12 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Beddis Iyapo | 2018-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 7.47 | 5 |
| Cesar Izturis | 2007-2007 | .167 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
