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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| David Ibáñez | 2012-2012 | 0 | 1 | .000 | 2.37 | 19 | 0 | 0 | 0 | 0 | 19.0 | 17 | 5 | 2 | 4 | 26 |
| Muneyaki Ichihara | 2018-2018 | 12 | 6 | .667 | 5.75 | 30 | 28 | 0 | 0 | 0 | 148.2 | 181 | 95 | 19 | 69 | 136 |
| Katsuhiko Ichikawa | 2015-2019 | 17 | 12 | .586 | 4.70 | 174 | 18 | 0 | 0 | 3 | 341.0 | 362 | 178 | 35 | 159 | 328 |
| Masafumi Ichikawa | 2015-2018 | 1 | 2 | .333 | 4.30 | 51 | 0 | 0 | 0 | 0 | 104.2 | 98 | 50 | 9 | 54 | 116 |
| Yosai Ikeda | 2014-2014 | 4 | 6 | .400 | 5.79 | 37 | 10 | 0 | 0 | 0 | 77.2 | 83 | 50 | 6 | 44 | 54 |
| Kuniaki Imai | 2014-2015 | 4 | 0 | 1.000 | 2.71 | 55 | 0 | 0 | 0 | 0 | 66.1 | 42 | 20 | 4 | 31 | 77 |
| Hiroaki Ine | 2018-2018 | 1 | 0 | 1.000 | 0.55 | 6 | 0 | 0 | 0 | 0 | 16.1 | 7 | 1 | 1 | 7 | 21 |
| Mitsuo Ine | 2018-2019 | 15 | 18 | .455 | 5.87 | 53 | 46 | 0 | 0 | 0 | 260.2 | 302 | 170 | 20 | 146 | 274 |
| Yoritomo Ine | 2017-2017 | 5 | 5 | .500 | 4.39 | 17 | 17 | 0 | 0 | 0 | 94.1 | 96 | 46 | 9 | 35 | 100 |
| Benjamin Ingleby | 2019-2019 | 0 | 0 | .000 | 3.12 | 4 | 0 | 0 | 0 | 0 | 8.2 | 8 | 3 | 0 | 12 | 9 |
| Artashes Injeyan | 2019-2019 | 4 | 0 | 1.000 | 3.19 | 52 | 0 | 0 | 0 | 3 | 73.1 | 69 | 26 | 6 | 33 | 73 |
| Dennis Inman | 2018-2018 | 0 | 0 | .000 | 1.02 | 13 | 0 | 0 | 0 | 2 | 17.2 | 9 | 2 | 0 | 8 | 32 |
| Jeff Inman | 2012-2014 | 0 | 0 | .000 | 6.00 | 11 | 0 | 0 | 0 | 0 | 15.0 | 18 | 10 | 3 | 5 | 15 |
| Sen Inoue | 2016-2016 | 0 | 1 | .000 | 9.35 | 8 | 0 | 0 | 0 | 0 | 8.2 | 17 | 9 | 1 | 6 | 8 |
| Sotan Inoue | 2016-2017 | 5 | 11 | .313 | 3.62 | 25 | 25 | 0 | 0 | 0 | 144.1 | 135 | 58 | 5 | 73 | 151 |
| Mokichi Ishida | 2012-2017 | 12 | 12 | .500 | 3.14 | 188 | 6 | 0 | 0 | 25 | 209.1 | 167 | 73 | 12 | 86 | 227 |
| Naomi Ishii | 2015-2019 | 13 | 11 | .542 | 5.64 | 152 | 1 | 0 | 0 | 2 | 186.2 | 193 | 117 | 14 | 113 | 188 |
| Izumo Ishikawa | 2015-2015 | 1 | 6 | .143 | 3.04 | 42 | 2 | 0 | 0 | 3 | 50.1 | 34 | 17 | 3 | 22 | 25 |
| Seb Ising | 2014-2017 | 5 | 2 | .714 | 4.37 | 65 | 1 | 0 | 0 | 4 | 90.2 | 106 | 44 | 7 | 54 | 66 |
| Ammar Isma'il | 2018-2019 | 22 | 14 | .611 | 5.18 | 52 | 52 | 0 | 0 | 0 | 272.2 | 310 | 157 | 20 | 132 | 276 |
| Yoritomo Ito | 2013-2015 | 9 | 13 | .409 | 4.42 | 61 | 23 | 0 | 0 | 2 | 191.1 | 186 | 94 | 21 | 78 | 168 |
| Yoshifumi Ito | 2017-2017 | 5 | 2 | .714 | 2.12 | 47 | 0 | 0 | 0 | 3 | 59.1 | 41 | 14 | 2 | 27 | 59 |
| Ken Ives | 2013-2017 | 7 | 9 | .438 | 3.98 | 156 | 0 | 0 | 0 | 13 | 158.1 | 137 | 70 | 11 | 107 | 213 |
| Okakura Iwasaki | 2017-2018 | 19 | 8 | .704 | 4.15 | 43 | 43 | 0 | 0 | 0 | 236.2 | 248 | 109 | 18 | 89 | 192 |
