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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Joe Ward | 0.000 | 2013 | |
| 2 | Kang-il Hyong# | 0.529 | 2033 | |
| 3 | Takeji Ogawa# | 0.540 | 2033 | |
| 4 | Paul Durden | 0.551 | 2015 | |
| 5 | Harold Hayne# | 0.563 | 2023 | |
| 6 | Jo-hsi Sang# | 1.019 | 2024 | |
| 7 | Ramón Gómez# | 1.174 | 2028 | |
| 7 | Lincoln Brouillette | 1.174 | 2015 | |
| 9 | Orlando Marés | 1.246 | 2029 | |
| 10 | Takeji Ogawa# | 1.286 | 2026 | |
| 11 | Willi Kehr# | 1.397 | 2030 | |
| 12 | Wes Mullen | 1.620 | 2018 | |
| 13 | Brent Welch | 1.646 | 2016 | |
| 14 | Paul Groulx# | 1.723 | 2026 | |
| 15 | Adharma Sughavanam# | 1.761 | 2027 | |
| 16 | Buddy Wills | 2.000 | 2016 | |
| 16 | Paul Cochran# | 2.000 | 2029 | |
| 18 | Terumoto Yamamoto | 2.025 | 2020 | |
| 19 | Wynn Cox# | 2.204 | 2029 | |
| 20 | Ashwini Sapthotharan | 2.250 | 2023 | |
| 21 | Jake Adkins# | 2.298 | 2031 | |
| 22 | Nicolas Rodrigues | 2.411 | 2019 | |
| 23 | Yoshiaga Rin# | 2.500 | 2027 | |
| 24 | Robert McLaughlin# | 2.571 | 2028 | |
| 25 | Ángel Manuel | 2.700 | 2018 | |
| 25 | Pablo Cuevas | 2.700 | 2018 | |
| 27 | Bernard Dupuis | 2.872 | 2019 | |
| 28 | John Stroud# | 2.880 | 2022 | |
| 29 | Cliff Stevens | 2.953 | 2015 | |
| 30 | Mikey Altman# | 3.115 | 2031 | |
| 31 | Carlos Estrada# | 3.176 | 2027 | |
| 32 | Oda Kudo | 3.418 | 2017 | |
| 33 | Carlos León# | 3.436 | 2026 | |
| 34 | Badarisaila Suravinda# | 3.500 | 2029 | |
| 35 | Mauro Durango# | 3.522 | 2030 | |
| 35 | Keith Rogers | 3.522 | 2023 | |
| 37 | Esteban Martínez | 3.553 | 2017 | |
| 38 | Yeong-suk Kim# | 3.649 | 2032 | |
| 39 | Kagehisa Saikawa# | 3.724 | 2026 | |
| 40 | António Medrano# | 3.927 | 2023 | |
| 41 | Jesús López | 3.938 | 2022 | |
| 42 | Kichibei Ozawa | 3.984 | 2026 | |
| 42 | Matsuyo Koda# | 3.984 | 2031 | |
| 44 | Scott Wilson | 4.021 | 2013 | |
| 45 | Vincent Vickers# | 4.050 | 2025 | |
| 46 | Derrick Scott | 4.109 | 2012 | |
| 47 | Jack Beard | 4.154 | 2016 | |
| 48 | Yoritomo Ine | 4.190 | 2020 | |
| 48 | Kenny Winston | 4.190 | 2017 | |
| 50 | Yeong-suk Kim# | 4.320 | 2028 | |
| 51 | Evan Taylor | 4.355 | 2018 | |
| 52 | Mokichi Nishiyama# | 4.433 | 2030 | |
| 53 | John Holmes# | 4.500 | 2029 | |
| 53 | Leonard Veeck | 4.500 | 2017 | |
| 53 | Joe Ward | 4.500 | 2014 | |
| 56 | Allen Hunt | 4.680 | 2020 | |
| 57 | Noriyuki Ikeda# | 4.737 | 2025 | |
| 58 | Hikaru Sekiguchi | 4.846 | 2022 | |
| 59 | Yeijiro Ishihara# | 4.909 | 2022 | |
| 60 | Yok-sing Tann# | 5.034 | 2030 | |
| 61 | Saiyid Mashwanis# | 5.087 | 2028 | |
| 61 | Lester Bisdu# | 5.087 | 2032 | |
| 63 | Amayas Nyamu# | 5.094 | 2028 | |
| 64 | Daniel Díaz | 5.143 | 2016 | |
| 65 | Akihito Sakei | 5.211 | 2021 | |
| 66 | Alejandro García# | 5.283 | 2022 | |
| 66 | Daniel Wilson# | 5.283 | 2024 | |
| 68 | José Gallegos | 5.294 | 2015 | |
| 69 | Alejandro Lafrosia# | 5.304 | 2030 | |
| 70 | James Akehurst# | 5.400 | 2029 | |
| 71 | Alberto Ramírez | 5.492 | 2025 | |
| 72 | John Witt | 5.625 | 2027 | |
| 73 | Atsushi Iitsuka# | 5.712 | 2027 | |
| 74 | David White | 5.870 | 2018 | |
| 75 | Gabin Martin | 5.940 | 2026 | |
| 76 | Mike Sprake | 6.000 | 2020 | |
| 77 | Ted Mills | 6.113 | 2023 | |
| 78 | Mitsuhide Ono | 6.600 | 2022 | |
| 79 | Scott Gorman | 6.612 | 2012 | |
| 80 | Hiroya Yoshida | 6.750 | 2020 | |
| 80 | Lloyd Huggins# | 6.750 | 2032 | |
| 80 | John Keith | 6.750 | 2021 | |
| 83 | Jesús Díaz# | 7.163 | 2032 | |
| 84 | Paul Durden | 7.200 | 2013 | |
| 84 | Manuel Zambrano | 7.200 | 2017 | |
| 86 | Tony Green | 7.269 | 2016 | |
| 87 | Matsuyo Koda# | 7.630 | 2033 | |
| 88 | Pedro Hernández | 8.027 | 2018 | |
| 89 | Sam Moore | 8.182 | 2025 | |
| 90 | Yoshiaga Rin# | 8.438 | 2025 | |
| 91 | Gustavo Mendoza | 9.600 | 2020 | |
| 92 | Joe Hurst# | 9.900 | 2030 |
