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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | António López | 0.488 | 2016-2026 | |
| 2 | Héctor Rodríguez | 0.853 | 2007-2017 | |
| 3 | Ding-bong Zhu# | 1.174 | 2038-2042 | |
| 4 | Félix Maese | 1.519 | 2014-2027 | |
| 5 | Jonathan Francis | 1.524 | 2020-2030 | |
| 6 | Colin Hopps | 1.653 | 2031-2037 | |
| 7 | Jeffrey Mendoza# | 1.670 | 2028-2042 | |
| 8 | Juan Jose Patino | 1.742 | 2025-2036 | |
| 9 | Shawn Marshall | 1.800 | 2018-2027 | |
| 10 | Ricardo Pérez* | 1.828 | 2022-2039 | |
| 11 | Eric Perkins | 1.845 | 2023-2031 | |
| 12 | Kyoichi Yoshimura | 1.890 | 2021-2025 | |
| 13 | Scotty Shorland# | 1.929 | 2030-2040 | |
| 13 | Brock Southey# | 1.929 | 2039-2042 | |
| 15 | Enrico Rosado | 1.946 | 2010-2021 | |
| 16 | Joaquín Hernández | 1.948 | 2007-2016 | |
| 17 | Orlando Ramos | 2.032 | 2008-2016 | |
| 18 | Curt Turner | 2.048 | 2015-2025 | |
| 19 | Bill Gallagher | 2.109 | 2017-2033 | |
| 20 | Markus Hancock* | 2.159 | 2008-2026 | |
| 21 | Jo Takahashi# | 2.160 | 2036-2042 | |
| 22 | Bryant Duncan | 2.168 | 2009-2024 | |
| 23 | Conan McCullough* | 2.210 | 2007-2018 | |
| 24 | Geoffrey Bowman# | 2.219 | 2036-2042 | |
| 25 | Ogai Ono# | 2.229 | 2032-2039 | |
| 26 | Michel Provost* | 2.231 | 2016-2030 | |
| 27 | Félix Garza | 2.250 | 2019-2027 | |
| 27 | Takahiro Takaki | 2.250 | 2021-2033 | |
| 29 | Michael Vincent | 2.274 | 2024-2035 | |
| 30 | Juan Acosta# | 2.276 | 2029-2042 | |
| 31 | Randy Smith* | 2.277 | 2016-2032 | |
| 32 | Shunsen Ueda | 2.291 | 2021-2029 | |
| 33 | Alfredo Aranda | 2.292 | 2016-2036 | |
| 33 | Matt Brown | 2.292 | 2025-2040 | |
| 33 | Lúcio Rodríguez | 2.292 | 2018-2031 | |
| 36 | Nelson Alvarado# | 2.323 | 2031-2042 | |
| 36 | Jim Ratzlaff | 2.323 | 2014-2030 | |
| 38 | Felipe Lara | 2.357 | 2007-2012 | |
| 39 | Jesús López | 2.362 | 2027-2037 | |
| 40 | Ángel Lara | 2.374 | 2007-2017 | |
| 41 | Gonzalo López | 2.392 | 2017-2027 | |
| 42 | Luis Jiménez# | 2.404 | 2034-2040 | |
| 43 | Bill Bradley | 2.406 | 2011-2017 | |
| 44 | Luis Gusmán | 2.408 | 2016-2028 | |
| 45 | Atílio Gaivo | 2.430 | 2021-2033 | |
| 46 | Dave Phelps | 2.434 | 2007-2016 | |
| 47 | Greg Bowen# | 2.483 | 2029-2039 | |
| 48 | Avery Carson | 2.488 | 2016-2027 | |
| 49 | Matt Benham | 2.503 | 2018-2027 | |
| 50 | Dave López# | 2.507 | 2038-2042 | |
| 51 | Víctor Matos | 2.508 | 2007-2016 | |
| 52 | Jhong-shun Kong | 2.514 | 2017-2029 | |
| 52 | Alberto Semblano | 2.514 | 2007-2021 | |
| 54 | Ramón Contreras | 2.522 | 2015-2029 | |
| 55 | Félix Ortega | 2.554 | 2011-2020 | |
| 56 | Kata Nakamura | 2.571 | 2020-2031 | |
| 57 | Kenny Ashley | 2.583 | 2017-2036 | |
| 58 | George Moss# | 2.584 | 2032-2042 | |
| 59 | Edgardo Díaz | 2.585 | 2021-2031 | |
| 59 | John Matthews | 2.585 | 2014-2023 | |
| 61 | Miguel Boroa# | 2.650 | 2037-2042 | |
| 62 | Brenden Clymo# | 2.680 | 2033-2042 | |
| 63 | Conner Hurst | 2.687 | 2017-2033 | |
| 64 | Dave Jones | 2.700 | 2022-2032 | |
| 64 | David López | 2.700 | 2021-2032 | |
| 66 | Brian Gutiérrez# | 2.742 | 2030-2039 | |
| 67 | Martín Hernández# | 2.746 | 2036-2042 | |
| 68 | Tetsuo Okazaki | 2.776 | 2012-2014 | |
| 69 | Cristo Santiago | 2.800 | 2014-2033 | |
| 70 | Gunner MacGruder* | 2.807 | 2014-2029 | |
| 71 | José López# | 2.808 | 2033-2042 | |
| 72 | Yakamochi Suitani* | 2.816 | 2021-2034 | |
| 73 | Adrian Peterson | 2.842 | 2015-2027 | |
| 74 | Edgardo Trevino# | 2.848 | 2033-2042 | |
| 75 | Simon Yates | 2.856 | 2007-2017 | |
| 76 | Anastasio López | 2.870 | 2014-2028 | |
| 77 | José Hernández | 2.872 | 2020-2033 | |
| 77 | Tsuramatsu Ito | 2.872 | 2018-2033 | |
| 79 | Leonard Carver | 2.885 | 2016-2029 | |
| 79 | Oniji Yokoyama | 2.885 | 2024-2031 | |
| 79 | Kiyohira Goto# | 2.885 | 2037-2042 | |
| 82 | René Padilla# | 2.888 | 2035-2042 | |
| 83 | Gustavo Hernández# | 2.911 | 2029-2042 | |
| 84 | Earl Lucas# | 2.914 | 2034-2042 | |
| 85 | Manuel Barrios | 2.935 | 2024-2034 | |
| 86 | Juan López# | 2.943 | 2027-2042 | |
| 87 | Javier Ferreira# | 2.956 | 2026-2035 | |
| 88 | Hamilton Cole | 2.961 | 2007-2019 | |
| 89 | Zenko Okada# | 2.970 | 2031-2042 | |
| 89 | Alfonso Ramos# | 2.970 | 2028-2039 | |
| 91 | Ramón Gonzáles | 2.977 | 2029-2040 | |
| 92 | Andy Crews | 3.000 | 2026-2037 | |
| 92 | Norberto Pacheco | 3.000 | 2008-2014 | |
| 94 | Bob Burns# | 3.022 | 2023-2042 | |
| 95 | Owen Barse# | 3.044 | 2030-2042 | |
| 96 | Henry Cluett# | 3.082 | 2030-2041 | |
| 97 | Nathan Dempster | 3.086 | 2028-2034 | |
| 98 | Declan Littleworth | 3.106 | 2024-2033 | |
| 99 | Francisco Encarn | 3.115 | 2014-2024 | |
| 100 | Clayton Lewis | 3.122 | 2016-2032 |
