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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tetsuzan Ichihara | 2024-2025 | 3 | 9 | .250 | 6.14 | 17 | 17 | 0 | 0 | 0 | 85.0 | 90 | 58 | 16 | 45 | 77 |
| Yoshikazu Ichihara | 2027-2027 | 3 | 3 | .500 | 3.44 | 14 | 14 | 0 | 0 | 0 | 68.0 | 61 | 26 | 5 | 30 | 77 |
| Junzo Ichikawa | 2024-2024 | 0 | 0 | .000 | 9.12 | 16 | 0 | 0 | 0 | 2 | 24.2 | 29 | 25 | 5 | 27 | 19 |
| Tsuneyo Ichikawa | 2023-2024 | 7 | 8 | .467 | 4.36 | 25 | 25 | 0 | 0 | 0 | 128.0 | 121 | 62 | 8 | 52 | 134 |
| Kei Ikarashi | 2025-2026 | 1 | 2 | .333 | 4.13 | 21 | 11 | 0 | 0 | 1 | 61.0 | 57 | 28 | 7 | 29 | 61 |
| Nobuyori Ikarashi | 2026-2026 | 1 | 0 | 1.000 | 9.31 | 10 | 0 | 0 | 0 | 0 | 9.2 | 16 | 10 | 3 | 8 | 9 |
| Shoin Ikarashi | 2025-2026 | 1 | 2 | .333 | 6.39 | 31 | 0 | 0 | 0 | 10 | 25.1 | 31 | 18 | 8 | 13 | 26 |
| Tadahisa Ikarashi | 2023-2024 | 3 | 4 | .429 | 5.58 | 27 | 13 | 0 | 0 | 0 | 69.1 | 63 | 43 | 9 | 47 | 69 |
| Eiichi Ikeda | 2025-2026 | 8 | 4 | .667 | 3.35 | 18 | 18 | 0 | 0 | 0 | 99.1 | 89 | 37 | 10 | 24 | 87 |
| Hidemichi Ikeda | 2024-2025 | 6 | 5 | .545 | 5.90 | 23 | 23 | 0 | 0 | 0 | 105.1 | 114 | 69 | 13 | 75 | 96 |
| Michihiro Ikeda | 2022-2023 | 2 | 2 | .500 | 6.66 | 31 | 1 | 0 | 0 | 0 | 50.0 | 55 | 37 | 11 | 30 | 45 |
| Morihiro Ikeda | 2024-2025 | 3 | 0 | 1.000 | 5.59 | 30 | 0 | 0 | 0 | 2 | 58.0 | 69 | 36 | 7 | 26 | 35 |
| Shoichi Ikeda | 2024-2024 | 3 | 5 | .375 | 4.55 | 11 | 11 | 0 | 0 | 0 | 57.1 | 65 | 29 | 6 | 17 | 62 |
| Shoji Ikeda | 2023-2024 | 0 | 0 | .000 | 4.22 | 11 | 2 | 0 | 0 | 1 | 21.1 | 18 | 10 | 2 | 13 | 29 |
| Takeru Ikeda | 2023-2024 | 5 | 5 | .500 | 5.92 | 40 | 5 | 0 | 0 | 2 | 89.2 | 102 | 59 | 21 | 66 | 81 |
| Kenko Ikeuchi | 2023-2024 | 2 | 6 | .250 | 4.19 | 35 | 0 | 0 | 0 | 13 | 34.1 | 32 | 16 | 5 | 22 | 38 |
| Dong-hee Im | 2023-2024 | 13 | 5 | .722 | 4.58 | 29 | 29 | 0 | 0 | 0 | 161.0 | 146 | 82 | 24 | 59 | 175 |
| In-sin Im | 2027-2027 | 3 | 2 | .600 | 4.82 | 11 | 11 | 0 | 0 | 0 | 52.1 | 60 | 28 | 5 | 33 | 55 |
| Kuniaki Imai | 2012-2012 | 6 | 1 | .857 | 1.64 | 35 | 0 | 0 | 0 | 18 | 38.1 | 21 | 7 | 4 | 7 | 59 |
| Shoichi Imai | 2022-2023 | 3 | 8 | .273 | 6.27 | 32 | 10 | 0 | 0 | 0 | 79.0 | 98 | 55 | 23 | 44 | 63 |
| Takahashi Imai | 2022-2022 | 3 | 2 | .600 | 6.00 | 9 | 9 | 0 | 0 | 0 | 42.0 | 49 | 28 | 8 | 13 | 55 |
| Kenzo Ine | 2025-2025 | 0 | 0 | .000 | 13.50 | 3 | 0 | 0 | 0 | 0 | 2.2 | 6 | 4 | 1 | 1 | 3 |
| Mabuchi Ine | 2025-2026 | 0 | 1 | .000 | 10.22 | 33 | 0 | 0 | 0 | 0 | 46.2 | 65 | 53 | 12 | 46 | 36 |
| Nobuhiko Ine | 2024-2024 | 2 | 1 | .667 | 3.38 | 10 | 0 | 0 | 0 | 0 | 18.2 | 15 | 7 | 4 | 10 | 24 |
| Noriaki Ine | 2027-2027 | 4 | 2 | .667 | 3.15 | 13 | 13 | 0 | 0 | 0 | 65.2 | 49 | 23 | 5 | 30 | 92 |
| Ryunosuke Ine | 2023-2023 | 5 | 0 | 1.000 | 3.42 | 16 | 16 | 0 | 0 | 0 | 100.0 | 82 | 38 | 10 | 28 | 99 |
| Tadamasa Ine | 2024-2025 | 5 | 4 | .556 | 6.55 | 34 | 1 | 0 | 0 | 1 | 55.0 | 55 | 40 | 12 | 40 | 47 |
| Yoichibei Ine | 2027-2027 | 1 | 3 | .250 | 6.70 | 20 | 7 | 0 | 0 | 0 | 48.1 | 56 | 36 | 10 | 43 | 57 |
| Yoritomo Ine | 2017-2017 | 6 | 3 | .667 | 3.33 | 15 | 15 | 1 | 1 | 0 | 92.0 | 98 | 34 | 2 | 25 | 80 |
| Artashes Injeyan | 2017-2018 | 3 | 2 | .600 | 4.93 | 9 | 7 | 0 | 0 | 0 | 42.0 | 49 | 23 | 8 | 15 | 45 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Josuke Inoue | 2027-2027 | 4 | 0 | 1.000 | 4.75 | 21 | 0 | 0 | 0 | 1 | 36.0 | 42 | 19 | 2 | 21 | 37 |
| Shojiro Inoue | 2023-2024 | 4 | 1 | .800 | 1.94 | 53 | 0 | 0 | 0 | 23 | 60.1 | 44 | 13 | 6 | 26 | 84 |
| Shumei Inoue | 2027-2027 | 2 | 6 | .250 | 6.18 | 14 | 14 | 0 | 0 | 0 | 67.0 | 74 | 46 | 17 | 33 | 49 |
| Toyokazu Inoue | 2025-2026 | 1 | 1 | .500 | 3.93 | 23 | 1 | 0 | 0 | 3 | 34.1 | 26 | 15 | 2 | 20 | 47 |
| Mostafa Isfahani | 2027-2027 | 3 | 4 | .429 | 3.86 | 12 | 12 | 0 | 0 | 0 | 56.0 | 49 | 24 | 3 | 37 | 40 |
| Iwane Ishida | 2024-2025 | 1 | 0 | 1.000 | 3.42 | 11 | 0 | 0 | 0 | 1 | 26.1 | 20 | 10 | 3 | 16 | 18 |
| Kazuo Ishida | 2025-2026 | 3 | 3 | .500 | 3.53 | 39 | 0 | 0 | 0 | 7 | 43.1 | 38 | 17 | 2 | 25 | 40 |
| Atsushi Ishikawa | 2027-2027 | 3 | 3 | .500 | 6.39 | 13 | 13 | 0 | 0 | 0 | 56.1 | 61 | 40 | 9 | 36 | 65 |
| Keitaro Ishikawa | 2024-2025 | 9 | 3 | .750 | 6.78 | 48 | 0 | 0 | 0 | 2 | 69.0 | 80 | 52 | 10 | 55 | 83 |
| Kikaku Ishikawa | 2024-2025 | 6 | 4 | .600 | 5.55 | 38 | 0 | 0 | 0 | 0 | 58.1 | 56 | 36 | 5 | 62 | 56 |
| Ammar Isma'il | 2017-2018 | 9 | 10 | .474 | 4.66 | 26 | 26 | 0 | 0 | 0 | 150.2 | 157 | 78 | 24 | 52 | 170 |
| Iwao Ito | 2022-2023 | 2 | 3 | .400 | 4.54 | 27 | 1 | 0 | 0 | 2 | 37.2 | 31 | 19 | 3 | 24 | 36 |
| Kenji Ito | 2027-2027 | 1 | 1 | .500 | 0.72 | 24 | 0 | 0 | 0 | 14 | 25.0 | 14 | 2 | 0 | 4 | 38 |
| Kuniaki Ito | 2024-2024 | 0 | 1 | .000 | 5.95 | 19 | 0 | 0 | 0 | 0 | 42.1 | 46 | 28 | 8 | 23 | 39 |
| Shumei Ito | 2027-2027 | 1 | 1 | .500 | 7.44 | 27 | 0 | 0 | 0 | 0 | 32.2 | 37 | 27 | 6 | 26 | 44 |
| Teinosuke Ito | 2024-2025 | 3 | 1 | .750 | 4.10 | 18 | 2 | 0 | 0 | 2 | 37.1 | 38 | 17 | 8 | 18 | 36 |
| Yorikane Ito | 2025-2026 | 3 | 1 | .750 | 7.36 | 36 | 0 | 0 | 0 | 1 | 55.0 | 72 | 45 | 11 | 43 | 46 |
| Yoriyoshi Ito | 2025-2026 | 4 | 2 | .667 | 4.50 | 47 | 0 | 0 | 0 | 2 | 82.0 | 87 | 41 | 12 | 52 | 77 |
| Yoshifumi Ito | 2016-2016 | 9 | 7 | .563 | 2.43 | 25 | 24 | 0 | 0 | 0 | 148.1 | 128 | 40 | 4 | 33 | 127 |
| Hiroharu Iwasaki | 2022-2023 | 2 | 6 | .250 | 9.71 | 40 | 0 | 0 | 0 | 0 | 38.0 | 54 | 41 | 7 | 41 | 41 |
| Kanko Iwasaki | 2024-2025 | 1 | 4 | .200 | 5.69 | 33 | 5 | 0 | 0 | 0 | 55.1 | 69 | 35 | 12 | 37 | 57 |
| Okakura Iwasaki | 2017-2017 | 8 | 2 | .800 | 3.84 | 15 | 15 | 0 | 0 | 0 | 93.2 | 86 | 40 | 9 | 24 | 83 |
| Taisuke Iwasaki | 2025-2026 | 3 | 3 | .500 | 3.11 | 39 | 0 | 0 | 0 | 4 | 37.2 | 26 | 13 | 3 | 22 | 42 |
| Takahiro Iwasaki | 2024-2025 | 3 | 8 | .273 | 7.23 | 18 | 18 | 0 | 0 | 0 | 69.2 | 81 | 56 | 13 | 46 | 74 |
| Tokuma Iwasaki | 2023-2024 | 3 | 5 | .375 | 6.78 | 17 | 17 | 0 | 0 | 0 | 75.2 | 86 | 57 | 19 | 48 | 77 |
