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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 | Paul Durden | 0.551 | 2015 | |
| 3 | Harold Hayne | 0.562 | 2023 | |
| 4 | Sergio Montantes# | 0.982 | 2052 | |
| 5 | Jo-hsi Sang | 1.019 | 2024 | |
| 6 | Ricky Juarez | 1.174 | 2043 | |
| 6 | Ramón Gómez | 1.174 | 2028 | |
| 6 | Lincoln Brouillette | 1.174 | 2015 | |
| 9 | Willi Kehr | 1.397 | 2030 | |
| 10 | Juan Lucero | 1.403 | 2038 | |
| 11 | Don Myers | 1.459 | 2034 | |
| 12 | Billy Kusnier# | 1.588 | 2054 | |
| 13 | Carlos Ramirez | 1.612 | 2044 | |
| 14 | Brent Welch | 1.646 | 2016 | |
| 15 | Alex Nambo | 1.714 | 2042 | |
| 16 | Paul Groulx | 1.723 | 2026 | |
| 17 | Adharma Sughavanam | 1.761 | 2027 | |
| 18 | Nate Lewis | 1.901 | 2047 | |
| 19 | Buddy Wills | 2.000 | 2016 | |
| 20 | Terumoto Yamamoto | 2.025 | 2020 | |
| 21 | Hector Martinez | 2.143 | 2043 | |
| 21 | Lance Collingridge | 2.143 | 2055 | |
| 23 | Jesús Rivera | 2.189 | 2037 | |
| 24 | Wynn Cox | 2.204 | 2029 | |
| 25 | Josh LeBlanc | 2.250 | 2039 | |
| 25 | Ashwini Sapthotharan | 2.250 | 2023 | |
| 27 | Pat Nettles | 2.288 | 2057 | |
| 28 | Jake Adkins | 2.298 | 2031 | |
| 28 | Alain Picard | 2.298 | 2036 | |
| 30 | Joel Hyle | 2.333 | 2054 | |
| 31 | James Crowe | 2.348 | 2038 | |
| 32 | Edgar Alvarez | 2.400 | 2040 | |
| 33 | Nicolas Rodrigues | 2.411 | 2019 | |
| 34 | Nate Hoffman | 2.418 | 2047 | |
| 35 | Devon Miller | 2.480 | 2047 | |
| 36 | Jun Nakayama | 2.500 | 2040 | |
| 36 | Yoshiaga Rin | 2.500 | 2027 | |
| 38 | Ramon Castillo | 2.520 | 2049 | |
| 39 | Robert McLaughlin | 2.571 | 2028 | |
| 40 | Tony Mireles# | 2.613 | 2060 | |
| 41 | Ángel Manuel | 2.700 | 2018 | |
| 41 | Pablo Cuevas | 2.700 | 2018 | |
| 41 | Will Witten# | 2.700 | 2060 | |
| 44 | Ramón Gómez | 2.746 | 2038 | |
| 45 | Perry Groenendijk | 2.755 | 2038 | |
| 46 | Ryan Eubanks | 2.805 | 2059 | |
| 47 | Juan Martínez | 2.826 | 2042 | |
| 48 | Bernard Dupuis | 2.872 | 2019 | |
| 48 | Alex Munoz | 2.872 | 2035 | |
| 50 | John Stroud | 2.880 | 2022 | |
| 51 | Tim Turner# | 2.893 | 2056 | |
| 52 | Cliff Stevens | 2.953 | 2015 | |
| 52 | Torikatzu Nishiyama | 2.953 | 2042 | |
| 54 | Alejandro Anaya# | 3.000 | 2059 | |
| 54 | Joey Cabler | 3.000 | 2045 | |
| 56 | Adam Rockwell# | 3.037 | 2050 | |
| 57 | Tu'utaki Eua | 3.115 | 2031 | |
| 57 | Cris Ayala | 3.115 | 2040 | |
| 59 | Carlos Estrada | 3.176 | 2027 | |
| 59 | Dustin Arcuri | 3.176 | 2044 | |
| 61 | Jorge Olivo | 3.203 | 2034 | |
| 62 | Steve Simons# | 3.240 | 2058 | |
| 63 | Dane Manwaring | 3.306 | 2035 | |
| 64 | Tony Dickie | 3.375 | 2058 | |
| 64 | Ramón Gómez | 3.375 | 2039 | |
| 66 | Oda Kudo | 3.418 | 2017 | |
| 67 | Carlos León | 3.436 | 2026 | |
| 68 | Franklin Rosas | 3.522 | 2056 | |
| 68 | Mauro Durango | 3.522 | 2030 | |
| 70 | Esteban Martínez | 3.553 | 2017 | |
| 71 | Emilio Peres | 3.635 | 2042 | |
| 72 | Yeong-suk Kim | 3.649 | 2032 | |
| 73 | Kagehisa Saikawa | 3.724 | 2026 | |
| 73 | Khalil Haywood# | 3.724 | 2053 | |
| 75 | António Medrano | 3.927 | 2023 | |
| 76 | Kichibei Ozawa | 3.984 | 2026 | |
| 77 | Scott Wilson | 4.021 | 2013 | |
| 77 | Ben Bower | 4.021 | 2038 | |
| 79 | Luis Padro# | 4.030 | 2053 | |
| 80 | Vincent Vickers | 4.050 | 2025 | |
| 81 | Derrick Scott | 4.109 | 2012 | |
| 82 | Jack Beard | 4.154 | 2016 | |
| 83 | Kenny Winston | 4.190 | 2017 | |
| 84 | Kody Kempa | 4.200 | 2045 | |
| 85 | Yeong-suk Kim | 4.320 | 2028 | |
| 86 | Mokichi Nishiyama | 4.433 | 2030 | |
| 87 | Bryan Stanford# | 4.443 | 2060 | |
| 88 | Ricky Juarez | 4.500 | 2041 | |
| 88 | Leonard Veeck | 4.500 | 2017 | |
| 88 | John Holmes | 4.500 | 2029 | |
| 88 | Joe Ward | 4.500 | 2014 | |
| 88 | Melvin Magdaleno | 4.500 | 2044 | |
| 93 | Alberto Dimas | 4.569 | 2045 | |
| 94 | Jesus Leon | 4.585 | 2055 | |
| 95 | Alain Picard | 4.596 | 2034 | |
| 96 | Lawrence Dugas# | 4.641 | 2060 | |
| 97 | Allen Hunt | 4.680 | 2020 | |
| 98 | Noriyuki Ikeda | 4.737 | 2025 | |
| 98 | Tommy Alexander | 4.737 | 2050 | |
| 100 | Tony Saldana | 4.860 | 2036 |
