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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Masato Kato | 1.558 | 2025 | |
| 2 | Masuhiro Ikeda | 1.803 | 2015 | |
| 3 | Kenji Matsumoto# | 2.069 | 2032 | |
| 4 | Toyokazu Kawamura | 2.077 | 2015 | |
| 5 | Naozane Macha# | 2.177 | 2038 | |
| 6 | Tabito Matsui | 2.215 | 2020 | |
| 7 | Kenji Matsumoto# | 2.216 | 2027 | |
| 8 | Kenji Matsumoto# | 2.292 | 2033 | |
| 9 | Masuhiro Ikeda | 2.518 | 2014 | |
| 10 | Nobuyoshi Endo# | 2.522 | 2042 | |
| 11 | Takehide Heida | 2.547 | 2025 | |
| 12 | Nobuyoshi Endo# | 2.588 | 2035 | |
| 13 | Robun Kondo | 2.608 | 2018 | |
| 14 | Masato Kato | 2.610 | 2024 | |
| 15 | Tasuku Okubo# | 2.618 | 2043 | |
| 16 | Nobuyoshi Endo# | 2.623 | 2036 | |
| 17 | Robun Kondo | 2.628 | 2020 | |
| 18 | Ryu Koga | 2.637 | 2021 | |
| 19 | Kenji Matsumoto# | 2.658 | 2028 | |
| 20 | Masato Kato | 2.661 | 2023 | |
| 21 | Takiji Kawashima | 2.662 | 2015 | |
| 22 | Yoriyoshi Hayagawa | 2.666 | 2016 | |
| 23 | Kenji Matsumoto# | 2.670 | 2029 | |
| 24 | Teruo Yamamoto# | 2.680 | 2042 | |
| 25 | Hiroya Araki# | 2.700 | 2041 | |
| 26 | Dae Tam | 2.708 | 2015 | |
| 27 | Tadakuni Oshima | 2.721 | 2035 | |
| 28 | Terry Crabtree | 2.743 | 2018 | |
| 29 | Nobuyoshi Endo# | 2.768 | 2041 | |
| 30 | José Jiménez | 2.795 | 2014 | |
| 31 | Nobuyoshi Endo# | 2.816 | 2039 | |
| 32 | Masato Kato | 2.831 | 2026 | |
| 33 | Júlio Díaz | 2.839 | 2021 | |
| 34 | Naizen Takuda | 2.863 | 2016 | |
| 35 | Teruo Yamamoto# | 2.885 | 2043 | |
| 36 | Alex Henderson | 2.889 | 2032 | |
| 37 | Masato Kato | 2.898 | 2021 | |
| 38 | Tasuku Okubo# | 2.924 | 2041 | |
| 39 | Nobuyoshi Endo# | 2.933 | 2040 | |
| 40 | Davis Harrington | 2.938 | 2033 | |
| 41 | Keith Latour# | 2.945 | 2042 | |
| 42 | Matsudaira Iida | 2.972 | 2016 | |
| 43 | Dae Tam | 2.986 | 2017 | |
| 44 | Kenji Matsumoto# | 2.988 | 2025 | |
| 45 | Terry Crabtree | 3.011 | 2017 | |
| 46 | Kenji Matsumoto# | 3.017 | 2030 | |
| 46 | Ángelo Rodríguez | 3.017 | 2021 | |
| 48 | Nobuyoshi Endo# | 3.035 | 2038 | |
| 49 | Masato Kato | 3.056 | 2022 | |
| 50 | Terry Crabtree | 3.079 | 2021 | |
| 51 | Kenji Matsumoto# | 3.115 | 2034 | |
| 52 | Teruo Yamamoto# | 3.130 | 2040 | |
| 53 | Yoshihiro Murata | 3.137 | 2020 | |
| 54 | Kenji Matsumoto# | 3.143 | 2026 | |
| 55 | Masato Kato | 3.212 | 2027 | |
| 56 | Harry Duder | 3.214 | 2027 | |
| 57 | Matsudaira Iida | 3.218 | 2017 | |
| 58 | Momoru Kato | 3.244 | 2015 | |
| 59 | Matsudaira Iida | 3.246 | 2015 | |
| 60 | Masato Kato | 3.251 | 2020 | |
| 61 | Shogo Kai | 3.254 | 2014 | |
| 62 | Dae Tam | 3.262 | 2016 | |
| 63 | Azumamaro Kamimura | 3.279 | 2026 | |
| 64 | Nobuyoshi Endo# | 3.301 | 2037 | |
| 65 | Carlos Morán# | 3.306 | 2040 | |
| 65 | Ryutaro Jouda | 3.306 | 2015 | |
| 67 | Danjuro Chikafuji# | 3.313 | 2039 | |
| 68 | Moromao Fujimoto# | 3.320 | 2039 | |
| 69 | Moromao Fujimoto# | 3.325 | 2038 | |
| 70 | Tabito Matsui | 3.331 | 2022 | |
| 71 | Danjuro Chikafuji# | 3.342 | 2037 | |
| 72 | Shinichi Endo# | 3.346 | 2042 | |
| 73 | Arturo Coronado | 3.352 | 2015 | |
| 74 | Rafael Toro | 3.355 | 2015 | |
| 75 | Danjuro Chikafuji# | 3.358 | 2041 | |
| 76 | Terry Crabtree | 3.362 | 2020 | |
| 76 | Norio Tanaka | 3.362 | 2025 | |
| 78 | Yasuyuki Ishikawa | 3.367 | 2027 | |
| 79 | Akio Tanaka# | 3.375 | 2035 | |
| 80 | Stephen Bywaters | 3.380 | 2033 | |
| 81 | Beppe Tartaglia | 3.394 | 2027 | |
| 82 | Enrico Colón | 3.398 | 2025 | |
| 83 | Robun Kondo | 3.404 | 2019 | |
| 84 | Takehide Heida | 3.418 | 2027 | |
| 85 | Yoriyoshi Hayagawa | 3.421 | 2018 | |
| 86 | Sadao Kawasawa | 3.424 | 2014 | |
| 87 | Takehide Heida | 3.428 | 2026 | |
| 88 | Xavier Oliva | 3.429 | 2022 | |
| 88 | Azumamaro Kamimura | 3.429 | 2030 | |
| 90 | Naozane Macha# | 3.431 | 2032 | |
| 91 | Yoriyoshi Hayagawa | 3.446 | 2015 | |
| 91 | Yoriyoshi Hayagawa | 3.446 | 2014 | |
| 93 | Celio Lages | 3.449 | 2033 | |
| 94 | Akio Tanaka# | 3.451 | 2041 | |
| 95 | Shoyo Eda | 3.456 | 2026 | |
| 95 | Toyokazu Kawamura | 3.456 | 2016 | |
| 97 | Kazuma Nakao | 3.458 | 2021 | |
| 98 | Danjuro Chikafuji# | 3.460 | 2035 | |
| 99 | Yoshihide Koike | 3.471 | 2026 | |
| 100 | Will Davis | 3.472 | 2014 |
