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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tadaaki Ichikawa | 2010-2013 | 0 | 0 | .000 | 5.03 | 9 | 0 | 0 | 0 | 2 | 19.2 | 15 | 11 | 3 | 8 | 17 |
| Eiichi Iida | 2050-2050 | 0 | 0 | .000 | 10.12 | 3 | 1 | 0 | 0 | 0 | 8.0 | 15 | 9 | 2 | 1 | 5 |
| Tadataka Iijima | 2016-2018 | 0 | 1 | .000 | 1.80 | 8 | 0 | 0 | 0 | 0 | 15.0 | 15 | 3 | 2 | 7 | 16 |
| Takeji Iijima | 2015-2015 | 1 | 7 | .125 | 10.76 | 21 | 6 | 0 | 0 | 0 | 49.1 | 88 | 59 | 12 | 26 | 7 |
| Isoruko Iitsuka | 2051-2051 | 4 | 15 | .211 | 5.48 | 23 | 23 | 0 | 0 | 0 | 138.0 | 153 | 84 | 16 | 57 | 90 |
| Masaaki Iitsuka | 2038-2045 | 60 | 47 | .561 | 2.76 | 507 | 0 | 0 | 0 | 145 | 1040.1 | 798 | 319 | 102 | 376 | 1279 |
| Yosai Ikeda | 2013-2013 | 1 | 1 | .500 | 4.75 | 5 | 5 | 0 | 0 | 0 | 30.1 | 35 | 16 | 4 | 11 | 17 |
| Yoshinobu Ikeda | 2042-2042 | 0 | 0 | .000 | 6.75 | 4 | 0 | 0 | 0 | 0 | 1.1 | 3 | 1 | 1 | 0 | 1 |
| António Infante | 2034-2034 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.2 | 1 | 0 | 0 | 1 | 1 |
| Henry Ingles | 2007-2009 | 11 | 14 | .440 | 4.65 | 65 | 34 | 3 | 1 | 3 | 269.0 | 304 | 139 | 32 | 61 | 119 |
| Harold Ingram | 2036-2048 | 59 | 92 | .391 | 5.73 | 345 | 150 | 21 | 5 | 30 | 1129.0 | 1250 | 719 | 224 | 392 | 960 |
| Bill Inman | 2007-2013 | 52 | 96 | .351 | 4.92 | 219 | 191 | 15 | 4 | 2 | 1186.0 | 1409 | 648 | 121 | 309 | 509 |
| Naomi Ishikawa | 2020-2027 | 12 | 28 | .300 | 4.32 | 300 | 0 | 0 | 0 | 104 | 310.2 | 270 | 149 | 43 | 145 | 350 |
| Iwane Ito | 2050-2050 | 2 | 2 | .500 | 4.23 | 15 | 6 | 0 | 0 | 1 | 55.1 | 52 | 26 | 9 | 19 | 44 |
| Naoki Ito | 2017-2021 | 1 | 0 | 1.000 | 7.16 | 50 | 0 | 0 | 0 | 1 | 76.2 | 99 | 61 | 17 | 34 | 65 |
| Teika Ito | 2040-2044 | 4 | 2 | .667 | 3.61 | 26 | 0 | 0 | 0 | 0 | 42.1 | 35 | 17 | 5 | 15 | 29 |
| Ron Ivey | 2042-2046 | 5 | 5 | .500 | 4.63 | 67 | 0 | 0 | 0 | 2 | 91.1 | 106 | 47 | 6 | 41 | 57 |
| Sotan Iwasaki | 2024-2034 | 40 | 50 | .444 | 3.51 | 682 | 0 | 0 | 0 | 304 | 672.1 | 533 | 262 | 48 | 422 | 856 |
