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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 | Félix Maese | 1.519 | 2014-2027 | |
| 4 | Jonathan Francis | 1.524 | 2020-2030 | |
| 5 | Colin Hopps | 1.653 | 2031-2037 | |
| 6 | Jeffrey Mendoza# | 1.670 | 2028-2040 | |
| 7 | Juan Jose Patino | 1.742 | 2025-2036 | |
| 8 | Shawn Marshall | 1.800 | 2018-2027 | |
| 9 | Ricardo Pérez | 1.828 | 2022-2039 | |
| 10 | Eric Perkins | 1.845 | 2023-2031 | |
| 11 | Kyoichi Yoshimura | 1.890 | 2021-2025 | |
| 12 | Scotty Shorland# | 1.929 | 2030-2040 | |
| 13 | Enrico Rosado | 1.946 | 2010-2021 | |
| 14 | Joaquín Hernández | 1.948 | 2007-2016 | |
| 15 | Kiyohira Goto# | 2.006 | 2037-2040 | |
| 16 | Orlando Ramos | 2.032 | 2008-2016 | |
| 17 | Curt Turner | 2.048 | 2015-2025 | |
| 18 | Bill Gallagher | 2.109 | 2017-2033 | |
| 19 | Markus Hancock* | 2.159 | 2008-2026 | |
| 20 | Bryant Duncan | 2.168 | 2009-2024 | |
| 21 | Juan Acosta# | 2.204 | 2029-2040 | |
| 22 | Conan McCullough* | 2.210 | 2007-2018 | |
| 23 | Ogai Ono# | 2.229 | 2032-2039 | |
| 24 | Michel Provost* | 2.231 | 2016-2030 | |
| 25 | Félix Garza | 2.250 | 2019-2027 | |
| 25 | Takahiro Takaki | 2.250 | 2021-2033 | |
| 27 | Jo Takahashi# | 2.271 | 2036-2040 | |
| 28 | Michael Vincent | 2.274 | 2024-2035 | |
| 29 | Randy Smith* | 2.277 | 2016-2032 | |
| 30 | Earl Lucas# | 2.288 | 2034-2040 | |
| 31 | Shunsen Ueda | 2.291 | 2021-2029 | |
| 32 | Alfredo Aranda | 2.292 | 2016-2036 | |
| 32 | Matt Brown# | 2.292 | 2025-2040 | |
| 32 | Lúcio Rodríguez | 2.292 | 2018-2031 | |
| 35 | Jim Ratzlaff | 2.323 | 2014-2030 | |
| 36 | Felipe Lara | 2.357 | 2007-2012 | |
| 37 | Jesús López# | 2.362 | 2027-2037 | |
| 38 | Ángel Lara | 2.374 | 2007-2017 | |
| 39 | Brenden Clymo# | 2.392 | 2033-2040 | |
| 39 | Gonzalo López | 2.392 | 2017-2027 | |
| 41 | Luis Jiménez# | 2.404 | 2034-2040 | |
| 42 | Bill Bradley | 2.406 | 2011-2017 | |
| 43 | Luis Gusmán | 2.408 | 2016-2028 | |
| 44 | Atílio Gaivo | 2.430 | 2021-2033 | |
| 45 | Dave Phelps | 2.434 | 2007-2016 | |
| 46 | Greg Bowen# | 2.483 | 2029-2039 | |
| 47 | Avery Carson | 2.488 | 2016-2027 | |
| 48 | Matt Benham | 2.503 | 2018-2027 | |
| 49 | Víctor Matos | 2.508 | 2007-2016 | |
| 50 | Jhong-shun Kong | 2.514 | 2017-2029 | |
| 50 | Alberto Semblano | 2.514 | 2007-2021 | |
| 52 | Geoffrey Bowman# | 2.517 | 2036-2040 | |
| 53 | Ramón Contreras | 2.522 | 2015-2029 | |
| 54 | Félix Ortega | 2.554 | 2011-2020 | |
| 55 | Kata Nakamura | 2.571 | 2020-2031 | |
| 56 | Kenny Ashley | 2.583 | 2017-2036 | |
| 57 | George Moss# | 2.584 | 2032-2040 | |
| 58 | Edgardo Díaz | 2.585 | 2021-2031 | |
| 58 | John Matthews | 2.585 | 2014-2023 | |
| 60 | Conner Hurst | 2.687 | 2017-2033 | |
| 61 | Dave Jones | 2.700 | 2022-2032 | |
| 61 | David López | 2.700 | 2021-2032 | |
| 63 | Brian Gutiérrez# | 2.742 | 2030-2039 | |
| 64 | Tetsuo Okazaki | 2.776 | 2012-2014 | |
| 65 | Cristo Santiago | 2.800 | 2014-2033 | |
| 66 | Gunner MacGruder* | 2.807 | 2014-2029 | |
| 67 | José López# | 2.808 | 2033-2040 | |
| 68 | Yakamochi Suitani* | 2.816 | 2021-2034 | |
| 69 | Bob Burns# | 2.837 | 2023-2040 | |
| 70 | Adrian Peterson | 2.842 | 2015-2027 | |
| 71 | Simon Yates | 2.856 | 2007-2017 | |
| 72 | Edgardo Trevino# | 2.860 | 2033-2040 | |
| 73 | Anastasio López | 2.870 | 2014-2028 | |
| 74 | José Hernández | 2.872 | 2020-2033 | |
| 74 | Tsuramatsu Ito | 2.872 | 2018-2033 | |
| 76 | Leonard Carver | 2.885 | 2016-2029 | |
| 76 | Oniji Yokoyama | 2.885 | 2024-2031 | |
| 78 | Gustavo Hernández# | 2.911 | 2029-2040 | |
| 79 | Manuel Barrios# | 2.935 | 2024-2034 | |
| 80 | Javier Ferreira# | 2.956 | 2026-2035 | |
| 81 | Hamilton Cole | 2.961 | 2007-2019 | |
| 82 | Zenko Okada# | 2.970 | 2031-2040 | |
| 82 | Alfonso Ramos# | 2.970 | 2028-2039 | |
| 84 | Henry Cluett# | 2.971 | 2030-2040 | |
| 85 | Ramón Gonzáles# | 2.977 | 2029-2040 | |
| 86 | Andy Crews | 3.000 | 2026-2037 | |
| 86 | Norberto Pacheco | 3.000 | 2008-2014 | |
| 88 | Luppe van Dam# | 3.031 | 2029-2040 | |
| 89 | Nathan Dempster | 3.086 | 2028-2034 | |
| 90 | Declan Littleworth | 3.106 | 2024-2033 | |
| 91 | Francisco Encarn | 3.115 | 2014-2024 | |
| 92 | Clayton Lewis | 3.122 | 2016-2032 | |
| 93 | Toby Ayers# | 3.140 | 2027-2040 | |
| 94 | Francisco Robles* | 3.142 | 2012-2030 | |
| 95 | José Díaz | 3.143 | 2021-2032 | |
| 96 | Juan López# | 3.152 | 2027-2040 | |
| 97 | Dan Boorman | 3.160 | 2023-2038 | |
| 98 | Owen Barse# | 3.184 | 2030-2040 | |
| 99 | Alfredo Velázquez | 3.189 | 2014-2026 | |
| 100 | Eric Elliott | 3.197 | 2025-2038 |
