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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jesús Ibarra | 2040-2054 | 110 | 82 | .573 | 3.86 | 773 | 164 | 1 | 0 | 61 | 1608.1 | 1615 | 690 | 237 | 294 | 1364 |
| Timothy Ibarra | 2020-2033 | 57 | 55 | .509 | 4.08 | 916 | 0 | 0 | 0 | 64 | 918.1 | 903 | 416 | 129 | 299 | 850 |
| David Ibañez | 2024-2026 | 7 | 18 | .280 | 5.39 | 63 | 29 | 0 | 0 | 0 | 207.0 | 248 | 124 | 23 | 85 | 127 |
| Juan Ibáñez | 2049-2058 | 53 | 48 | .525 | 3.96 | 488 | 70 | 1 | 0 | 26 | 870.2 | 910 | 383 | 100 | 255 | 724 |
| Júlio Ibáñez | 2044-2057 | 69 | 100 | .408 | 3.91 | 606 | 167 | 1 | 1 | 94 | 1398.2 | 1407 | 607 | 143 | 490 | 990 |
| Juan Icaza | 2044-2056 | 40 | 37 | .519 | 3.77 | 689 | 0 | 0 | 0 | 67 | 720.0 | 589 | 302 | 63 | 383 | 955 |
| Koichi Ichikawa | 2027-2034 | 38 | 39 | .494 | 4.88 | 152 | 126 | 1 | 0 | 1 | 745.0 | 859 | 404 | 75 | 259 | 516 |
| Hidehira Ichisada | 2057-2059 | 5 | 4 | .556 | 4.44 | 56 | 1 | 0 | 0 | 2 | 93.1 | 85 | 46 | 16 | 36 | 75 |
| Kureigu Ichiyo | 2014-2025 | 99 | 123 | .446 | 4.39 | 402 | 307 | 3 | 1 | 3 | 1968.0 | 2131 | 960 | 299 | 348 | 1399 |
| Meiji Ikeda | 2068-2070 | 2 | 6 | .250 | 7.19 | 46 | 0 | 0 | 0 | 4 | 51.1 | 75 | 41 | 7 | 27 | 47 |
| Hun Im | 2054-2056 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 1 | 1.0 | 1 | 0 | 0 | 0 | 0 |
| Jong-beom Im | 2039-2039 | 0 | 1 | .000 | 7.50 | 25 | 0 | 0 | 0 | 0 | 30.0 | 38 | 25 | 6 | 12 | 22 |
| Larry Ingilby | 2070-2070 | 0 | 0 | .000 | 6.97 | 4 | 0 | 0 | 0 | 1 | 10.1 | 11 | 8 | 2 | 3 | 8 |
| Henry Inman | 2025-2028 | 6 | 10 | .375 | 5.12 | 46 | 13 | 0 | 0 | 0 | 135.1 | 136 | 77 | 18 | 78 | 121 |
| Takao Inoue | 2054-2056 | 4 | 5 | .444 | 6.43 | 27 | 6 | 0 | 0 | 0 | 63.0 | 77 | 45 | 12 | 39 | 47 |
| Yasushi Inoue | 2070-2070 | 1 | 0 | 1.000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 3.1 | 0 | 0 | 0 | 0 | 3 |
| Norm Irwin | 2034-2037 | 4 | 8 | .333 | 5.33 | 209 | 1 | 0 | 0 | 1 | 216.0 | 226 | 128 | 38 | 95 | 200 |
| Sotan Ishiguro | 2055-2068 | 69 | 52 | .570 | 4.64 | 278 | 170 | 2 | 1 | 8 | 1105.0 | 1197 | 570 | 180 | 309 | 980 |
| Mitsuzuka Ishihara | 2065-2070 | 34 | 38 | .472 | 4.44 | 162 | 89 | 3 | 1 | 1 | 673.2 | 586 | 332 | 66 | 345 | 811 |
| Matthew Islam | 2021-2029 | 26 | 29 | .473 | 4.11 | 559 | 0 | 0 | 0 | 9 | 641.1 | 701 | 293 | 71 | 174 | 502 |
| Felipe Izazaja | 2060-2068 | 15 | 33 | .312 | 4.75 | 154 | 69 | 0 | 0 | 1 | 530.0 | 570 | 280 | 93 | 183 | 455 |
