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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Tokaji Goto# | 1.467 | 2015-2015 | |
| 2 | Kinnosuke Sato# | 1.708 | 2013-2013 | |
| 3 | Koji Kojima | 1.767 | 2014-2014 | |
| 4 | Tsuneyo Kakutama# | 2.135 | 2013-2013 | |
| 5 | Seinosuke Yokota | 2.186 | 2013-2013 | |
| 6 | Yoshinobu Kondo | 2.281 | 2012-2012 | |
| 7 | Yoritomo Ito | 2.334 | 2012-2012 | |
| 8 | Narahiko Miyazaki | 2.355 | 2015-2015 | |
| 9 | Tadanobu Kamida | 2.368 | 2014-2014 | |
| 10 | Yoshifumi Ito# | 2.427 | 2016-2016 | |
| 11 | Nobuhisa Yamashita# | 2.443 | 2013-2013 | |
| 12 | Nobuhisa Aoki | 2.553 | 2015-2015 | |
| 13 | Takao Onishi# | 2.690 | 2014-2014 | |
| 14 | Kosaku Sakaguchi | 2.721 | 2015-2015 | |
| 15 | Sakutaro Eida# | 2.722 | 2012-2012 | |
| 16 | Sumitomo Noda# | 2.752 | 2012-2012 | |
| 17 | Subaru Kishita# | 2.845 | 2016-2016 | |
| 18 | Tadao Suzuki | 2.909 | 2012-2012 | |
| 19 | Isei Okada | 2.953 | 2014-2014 | |
| 20 | Hiroji Kishita# | 2.976 | 2015-2015 | |
| 21 | Reijiro Yamaguchi# | 3.013 | 2013-2013 | |
| 22 | Kenzo Takashita | 3.018 | 2012-2012 | |
| 23 | Toshikasu Takahashi# | 3.060 | 2016-2016 | |
| 23 | Ikki Shiba | 3.060 | 2012-2012 | |
| 25 | Toshio Kouno# | 3.078 | 2016-2016 | |
| 26 | Hideki Ohayashi# | 3.084 | 2015-2015 | |
| 27 | Yujiro Tanaka | 3.087 | 2012-2012 | |
| 28 | Ryunosuke Takahashi | 3.094 | 2013-2013 | |
| 29 | Mushanokoji Uchida# | 3.096 | 2012-2012 | |
| 30 | Shinji Matsuoka | 3.103 | 2015-2015 | |
| 31 | Hisanobu Taniguchi# | 3.124 | 2016-2016 | |
| 32 | Yataro Kobayashi# | 3.127 | 2012-2012 | |
| 33 | Yasujiro Koda# | 3.197 | 2016-2016 | |
| 34 | Ramu Pavi# | 3.206 | 2017-2018 | |
| 35 | Kazuhiro Taguchi# | 3.212 | 2013-2013 | |
| 36 | Tadashi Sakamoto# | 3.248 | 2014-2014 | |
| 37 | Yoshiaga Ueno# | 3.260 | 2015-2015 | |
| 38 | Feng-linag Hor# | 3.300 | 2017-2018 | |
| 39 | Sadanobu Kichida | 3.333 | 2016-2016 | |
| 40 | Hirofumi Matsumoto | 3.338 | 2014-2014 | |
| 41 | Yataro Honda# | 3.342 | 2016-2016 | |
| 42 | Iemochi Kurihara | 3.360 | 2014-2014 | |
| 43 | Tsuneo Sugimoto | 3.366 | 2016-2016 | |
| 44 | Kulapati Pandian# | 3.375 | 2017-2018 | |
| 45 | Naomi Ishii# | 3.392 | 2014-2014 | |
| 46 | Atsushi Takahashi# | 3.421 | 2015-2015 | |
| 47 | Tekkan Honma | 3.435 | 2016-2016 | |
| 48 | Takashi Yamasaki# | 3.438 | 2012-2012 | |
| 49 | Qing-hua Gai# | 3.450 | 2018-2018 | |
| 50 | Kazuhiko Kanno# | 3.458 | 2012-2012 | |
| 51 | Yoshihide Takahashi | 3.465 | 2015-2015 | |
| 52 | Masahide Memoto# | 3.500 | 2013-2013 | |
| 53 | Toshiki Koda# | 3.511 | 2012-2012 | |
| 54 | Atsumori Kitano | 3.563 | 2013-2013 | |
| 55 | Tsutomu Suzuki | 3.640 | 2012-2012 | |
| 56 | Takahiro Hashimoto# | 3.667 | 2017-2017 | |
| 57 | Sakutaro Tada | 3.709 | 2016-2016 | |
| 57 | Hiroaki Ine# | 3.709 | 2012-2012 | |
| 59 | Mamoru Yamaguchi | 3.736 | 2012-2012 | |
| 60 | Olivier Martin# | 3.760 | 2017-2018 | |
| 61 | Takanobu Tanaka | 3.773 | 2015-2015 | |
| 62 | Soleh Purbacaraka# | 3.795 | 2017-2018 | |
| 63 | Xiao-mei Xuan# | 3.802 | 2017-2018 | |
| 64 | Rikyu Hara | 3.835 | 2016-2016 | |
| 65 | Oda Kudo# | 3.857 | 2016-2016 | |
| 66 | Josuke Wada# | 3.894 | 2015-2015 | |
| 67 | Fu-po Eng# | 3.898 | 2017-2018 | |
| 68 | Juichi Ichihara | 3.942 | 2013-2013 | |
| 69 | Masaki Kichida | 3.944 | 2015-2015 | |
| 70 | Terumoto Yamamoto# | 3.947 | 2014-2014 | |
| 71 | Jun'ichi Kimura# | 3.957 | 2016-2016 | |
| 72 | Mulia Kathirithamby# | 3.971 | 2017-2018 | |
| 73 | Takuji Taguchi# | 3.987 | 2015-2015 | |
| 74 | Mashashi Tanaka | 4.013 | 2015-2015 | |
| 75 | Kumanosuke Ine# | 4.017 | 2017-2017 | |
| 76 | Teika Yamada | 4.026 | 2012-2012 | |
| 77 | Oda Kondo | 4.031 | 2014-2014 | |
| 78 | Ashwini Sapthotharan# | 4.081 | 2017-2018 | |
| 79 | Haruki Ohashi | 4.127 | 2014-2014 | |
| 80 | Tadamasa Kiyomizu | 4.154 | 2012-2012 | |
| 81 | Shoin Maekawa# | 4.219 | 2012-2012 | |
| 82 | Takakazu Kichida | 4.234 | 2015-2015 | |
| 83 | Masamune Hayashi | 4.245 | 2016-2016 | |
| 84 | Shinsui Nakayama | 4.284 | 2015-2015 | |
| 85 | Jotaro Kobayashi | 4.323 | 2016-2016 | |
| 86 | Muneyaki Ichihara | 4.327 | 2014-2014 | |
| 87 | Hisamitsu Kohara | 4.328 | 2013-2013 | |
| 88 | Morihiro Miyamoto | 4.339 | 2012-2012 | |
| 89 | Senzo Heida | 4.383 | 2012-2012 | |
| 90 | Ryoma Kondo | 4.391 | 2014-2014 | |
| 91 | Danh-Canh Tru# | 4.394 | 2017-2018 | |
| 92 | Kunimatsu Taniguchi | 4.400 | 2013-2013 | |
| 93 | Jun Ono | 4.449 | 2012-2012 | |
| 94 | Takanobu Tanaka | 4.466 | 2012-2012 | |
| 95 | Sugimoto Morimoto# | 4.469 | 2013-2013 | |
| 96 | Kuniyoshi Nakanishi | 4.514 | 2015-2015 | |
| 97 | Tetsui Nishida# | 4.539 | 2014-2014 | |
| 98 | Noriaki Kichida# | 4.540 | 2014-2014 | |
| 99 | Shigeru Hiranuma | 4.546 | 2013-2013 | |
| 100 | Toshimichi Abe | 4.558 | 2015-2015 |
