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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Ed Brown | 2.413 | 1950-1951 | |
| 2 | Naoto Yoshinaga# | 2.810 | 1956-1961 | |
| 3 | Morihiro Arakaki# | 2.859 | 1954-1961 | |
| 4 | Tatsuo Sato# | 2.902 | 1956-1961 | |
| 5 | Keiji Tamura# | 2.951 | 1956-1961 | |
| 6 | Masatoshi Sakai# | 2.973 | 1954-1961 | |
| 7 | Shinki Kimura# | 2.990 | 1952-1961 | |
| 8 | Teruaki Koyama# | 2.996 | 1953-1961 | |
| 9 | Arata Komatsu# | 3.057 | 1956-1961 | |
| 10 | Sadato Hayakawa# | 3.067 | 1954-1961 | |
| 11 | Steve Noel | 3.093 | 1950-1959 | |
| 12 | Yoshitora Nakagawa | 3.097 | 1953-1961 | |
| 13 | Masato Yamamoto# | 3.102 | 1952-1961 | |
| 14 | Kinzo Yoshimura# | 3.103 | 1950-1961 | |
| 15 | Shigeyasu Hirayama# | 3.197 | 1953-1961 | |
| 16 | Tadaatsu Miki# | 3.207 | 1950-1961 | |
| 17 | Tomochika Takada# | 3.225 | 1957-1961 | |
| 18 | Haruki Ogawa# | 3.262 | 1956-1961 | |
| 19 | Akimasa Murakami# | 3.269 | 1957-1961 | |
| 20 | Itsuya Takahashi | 3.314 | 1950-1959 | |
| 21 | Fumimaro Yamauchi# | 3.317 | 1958-1961 | |
| 22 | Eichiro Ueno# | 3.327 | 1950-1961 | |
| 23 | Tadaatsu Sunada# | 3.385 | 1953-1961 | |
| 24 | Kannon Kato# | 3.395 | 1952-1961 | |
| 24 | Minao Akagi# | 3.395 | 1953-1961 | |
| 26 | Takamichi Smith# | 3.413 | 1952-1961 | |
| 27 | Toshimasa Kobayashi# | 3.421 | 1958-1961 | |
| 28 | Minoru Yamamoto# | 3.432 | 1955-1961 | |
| 29 | Nobuto Sakai | 3.436 | 1952-1959 | |
| 30 | Norito Yamazaki# | 3.447 | 1950-1961 | |
| 31 | Takahiko Kurata# | 3.450 | 1954-1961 | |
| 32 | Ikuo Kanazawa# | 3.459 | 1950-1961 | |
| 33 | Seishiro Kikuchi# | 3.526 | 1957-1961 | |
| 34 | Isoroku Furuta# | 3.567 | 1955-1961 | |
| 35 | Genichi Tsukamoto# | 3.572 | 1956-1961 | |
| 36 | Seikichi Nagamatsu# | 3.582 | 1956-1961 | |
| 37 | Kyouhei Sakata | 3.628 | 1950-1961 | |
| 38 | Katsumi Sato# | 3.637 | 1950-1961 | |
| 39 | Dan Rivard | 3.642 | 1950-1956 | |
| 40 | Gene Walker# | 3.663 | 1958-1961 | |
| 41 | Tomohito Kimura | 3.684 | 1950-1960 | |
| 42 | Yoshimatsu Shiina# | 3.697 | 1958-1961 | |
| 43 | Genya Ishii# | 3.703 | 1953-1961 | |
| 44 | Kijuro Fukushima# | 3.704 | 1956-1961 | |
| 45 | Ryusuke Maeda# | 3.706 | 1953-1961 | |
| 46 | Toshio Iwamoto# | 3.728 | 1952-1961 | |
| 47 | Sumiteru Yoshida | 3.742 | 1951-1961 | |
| 48 | Takuyuki Shimizu | 3.762 | 1953-1958 | |
| 49 | Kiemon Matsuda | 3.784 | 1951-1960 | |
| 50 | Toshinori Osada# | 3.858 | 1956-1961 | |
| 51 | Benkei Nakao | 3.860 | 1952-1960 | |
| 52 | Yukiharu Goto# | 3.902 | 1954-1961 | |
| 53 | Yuushuu Nakata# | 3.951 | 1955-1961 | |
| 54 | Masakado Matsuda# | 3.985 | 1954-1961 | |
| 55 | Teizo Hasegawa# | 4.011 | 1950-1960 | |
| 56 | Teiljo Okamoto# | 4.012 | 1956-1961 | |
| 57 | Tadanori Miyata# | 4.063 | 1955-1961 | |
| 58 | Art Marx# | 4.073 | 1957-1961 | |
| 58 | Kiichi Takahashi# | 4.073 | 1953-1961 | |
| 60 | Rei Suga# | 4.081 | 1955-1961 | |
| 61 | Tatsuki Goto# | 4.083 | 1956-1961 | |
| 62 | Hirotsugu Sasaki# | 4.106 | 1954-1961 | |
| 63 | Komiya Takahashi# | 4.109 | 1956-1961 | |
| 64 | Masali Tabata# | 4.133 | 1957-1961 | |
| 65 | Tsunemori Takanezawa# | 4.158 | 1956-1961 | |
| 66 | Kiyohiro Okazaki# | 4.214 | 1952-1961 | |
| 67 | Satoshi Smith | 4.229 | 1951-1952 | |
| 68 | Yoshii Mizuno# | 4.232 | 1952-1961 | |
| 69 | Shigeto Kawakami# | 4.252 | 1957-1961 | |
| 70 | Satsuya Shindo# | 4.257 | 1950-1961 | |
| 71 | Munehiro Toyama# | 4.258 | 1952-1961 | |
| 72 | Kiyoshige Abe# | 4.277 | 1954-1961 | |
| 73 | Toshinori Nagase# | 4.332 | 1953-1961 | |
| 74 | Toshiyoshi Sakata# | 4.333 | 1952-1961 | |
| 75 | Mikiyasu Sakata# | 4.365 | 1958-1961 | |
| 76 | Katsunan Umemoto | 4.376 | 1950-1957 | |
| 77 | Josuke Fujimori# | 4.397 | 1951-1961 | |
| 78 | Kinichi Ota# | 4.406 | 1956-1961 | |
| 79 | Hod Taylor Jr.# | 4.419 | 1956-1961 | |
| 80 | Paul Baker | 4.468 | 1951-1960 | |
| 81 | Kiyomitsu Wada# | 4.473 | 1958-1961 | |
| 82 | Isato Kosaka | 4.505 | 1950-1957 | |
| 83 | Mitsukuni Yoshimura# | 4.521 | 1954-1961 | |
| 84 | Natsuhiko Sugiura# | 4.578 | 1958-1961 | |
| 85 | Ienari Takagi# | 4.642 | 1951-1961 | |
| 86 | Hisamichi Nakashima | 4.731 | 1952-1960 | |
| 87 | Itaru Takayama# | 4.735 | 1955-1961 | |
| 88 | Sadao Arai# | 4.763 | 1956-1961 | |
| 89 | Tadanao Kawai | 4.774 | 1954-1960 | |
| 90 | Ollie White | 4.805 | 1956-1961 | |
| 91 | Seiichi Matsuda | 4.977 | 1953-1960 | |
| 92 | Toshitada Masuda# | 4.993 | 1954-1961 | |
| 93 | Toshitada Morino# | 5.103 | 1956-1961 | |
| 94 | Atsuhiro Smith# | 5.139 | 1959-1961 | |
| 95 | Toshitake Ochiai | 5.161 | 1950-1959 |
