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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| José Ibáñez | 1973-1981 | 11 | 16 | .407 | 4.56 | 95 | 15 | 4 | 0 | 8 | 232.2 | 237 | 118 | 21 | 138 | 104 |
| Ramón Ibarra | 1948-1957 | 0 | 0 | .000 | 0.00 | 2 | 0 | 0 | 0 | 0 | 3.2 | 4 | 0 | 0 | 2 | 2 |
| Okura Ichihara | 1964-1969 | 15 | 12 | .556 | 3.32 | 63 | 28 | 4 | 1 | 1 | 222.0 | 222 | 82 | 18 | 58 | 152 |
| Naganori Ikeda | 1947-1954 | 1 | 0 | 1.000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 0 | 0 | 0 | 0 | 0 |
| Taizo Ikeda | 1986-1989 | 3 | 1 | .750 | 3.64 | 18 | 18 | 0 | 0 | 0 | 71.2 | 62 | 29 | 7 | 28 | 28 |
| Luca Iles | 1932-1937 | 12 | 12 | .500 | 3.85 | 49 | 22 | 11 | 1 | 1 | 215.0 | 237 | 92 | 10 | 73 | 51 |
| Sidney Illidge | 1983-1983 | 0 | 0 | .000 | 3.38 | 1 | 0 | 0 | 0 | 0 | 2.2 | 5 | 1 | 1 | 3 | 1 |
| Tyler Ince | 1981-1981 | 3 | 0 | 1.000 | 4.44 | 19 | 0 | 0 | 0 | 0 | 26.1 | 37 | 13 | 3 | 10 | 8 |
| Mason Ing | 1975-1978 | 4 | 1 | .800 | 4.21 | 32 | 0 | 0 | 0 | 1 | 47.0 | 55 | 22 | 5 | 32 | 29 |
| Yasuhiko Inoue | 1940-1952 | 0 | 1 | .000 | 11.00 | 4 | 2 | 0 | 0 | 0 | 9.0 | 16 | 11 | 1 | 7 | 3 |
| Masayuki Ishihara | 1973-1984 | 9 | 10 | .474 | 4.87 | 77 | 0 | 0 | 0 | 3 | 101.2 | 101 | 55 | 15 | 64 | 72 |
| Rikiya Ishikawa | 1939-1952 | 57 | 75 | .432 | 4.85 | 210 | 146 | 59 | 4 | 5 | 1210.2 | 1336 | 653 | 84 | 708 | 463 |
