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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Oscar Villalpando | 1.603 | 2014 | |
| 2 | Jack Knapp | 1.885 | 2028 | |
| 3 | Buster Ducharme | 1.890 | 2015 | |
| 4 | Waldo Solleveld | 2.150 | 2026 | |
| 5 | David Alcala | 2.210 | 2014 | |
| 6 | James Ferguson# | 2.240 | 2034 | |
| 7 | Pancho López | 2.338 | 2018 | |
| 8 | Samuel Rodledo# | 2.433 | 2025 | |
| 9 | Alfredo Herrero | 2.439 | 2014 | |
| 10 | Rafael Pamblanco | 2.507 | 2019 | |
| 11 | Jay Runner | 2.515 | 2013 | |
| 12 | David Clark | 2.535 | 2023 | |
| 13 | Rodrigo Padilla# | 2.542 | 2033 | |
| 14 | Jermaine Earp | 2.563 | 2015 | |
| 15 | José Sánchez# | 2.568 | 2033 | |
| 16 | Einar Gaona | 2.601 | 2014 | |
| 17 | Michael Montgomery | 2.607 | 2015 | |
| 18 | Gastone Capasso# | 2.616 | 2032 | |
| 19 | Thomas Moore | 2.649 | 2019 | |
| 20 | Jeffrey Brunton | 2.661 | 2017 | |
| 21 | Seiji Masuda | 2.670 | 2021 | |
| 22 | Woodrow Claytor | 2.691 | 2021 | |
| 23 | Salomon Candelas | 2.700 | 2021 | |
| 23 | Einar Gaona | 2.700 | 2016 | |
| 25 | Pete Boyle# | 2.705 | 2035 | |
| 26 | António Cerda | 2.706 | 2021 | |
| 27 | Benicio Castro | 2.713 | 2016 | |
| 28 | Charles Olaughlin | 2.739 | 2016 | |
| 29 | Shawn MacNeill | 2.754 | 2031 | |
| 30 | Robert Mumford | 2.767 | 2017 | |
| 31 | José Rivera# | 2.773 | 2035 | |
| 32 | Jose Feijoo | 2.796 | 2013 | |
| 33 | Carl Shepherd | 2.810 | 2015 | |
| 34 | Claudio Guillén | 2.815 | 2022 | |
| 35 | Fred Jones | 2.816 | 2014 | |
| 36 | Juan Guzman | 2.819 | 2018 | |
| 37 | Joseph Brown | 2.829 | 2022 | |
| 38 | Bill Critch | 2.832 | 2022 | |
| 39 | Bartolo Olivarez | 2.835 | 2019 | |
| 40 | David Rutledge | 2.842 | 2016 | |
| 41 | Glen Mitchell | 2.851 | 2018 | |
| 41 | Clarence Craig | 2.851 | 2020 | |
| 43 | Juan Guzman | 2.853 | 2017 | |
| 44 | Rogelio Castro | 2.856 | 2016 | |
| 45 | Claudio Sánchez | 2.872 | 2023 | |
| 46 | Hai Elbert | 2.883 | 2013 | |
| 47 | Alfredo Hernández | 2.887 | 2028 | |
| 47 | Vicente Gallegos# | 2.887 | 2031 | |
| 49 | Alan Blessing | 2.906 | 2017 | |
| 50 | Kendrick Kaler | 2.914 | 2014 | |
| 51 | Carlos Morales# | 2.921 | 2032 | |
| 52 | José Rodríguez# | 2.929 | 2032 | |
| 53 | Jesús González# | 2.940 | 2033 | |
| 54 | William Haner | 2.947 | 2017 | |
| 55 | Juan Morrales | 2.957 | 2017 | |
| 56 | Gastone Capasso# | 2.964 | 2034 | |
| 57 | Sherman Powers# | 2.967 | 2031 | |
| 58 | Bruce Roughley | 2.969 | 2022 | |
| 59 | Clayton Robison | 2.980 | 2022 | |
| 60 | Agustin Vasco | 2.988 | 2015 | |
| 61 | Gordon Gaddy | 2.995 | 2020 | |
| 62 | Rogelio Castro | 3.015 | 2021 | |
| 63 | Chris Taylor | 3.017 | 2020 | |
| 64 | Fred Jones | 3.021 | 2019 | |
| 65 | John Hoffman | 3.022 | 2015 | |
| 66 | Eric Hopper | 3.030 | 2018 | |
| 67 | Alan Blessing | 3.034 | 2019 | |
| 68 | Milton Rael | 3.054 | 2014 | |
| 69 | Will Walker | 3.060 | 2032 | |
| 70 | Armando Sánchez | 3.068 | 2028 | |
| 71 | Gil Moore | 3.074 | 2023 | |
| 72 | David Alcala | 3.075 | 2013 | |
| 73 | Brian Pearson | 3.077 | 2016 | |
| 74 | William Brooks# | 3.082 | 2027 | |
| 75 | Claudio Flores# | 3.098 | 2024 | |
| 76 | Bruno Talamantez | 3.115 | 2014 | |
| 77 | Buster Ducharme | 3.119 | 2017 | |
| 78 | David Reimers | 3.122 | 2020 | |
| 79 | Luis Salazar# | 3.124 | 2022 | |
| 80 | Floyd Crown | 3.127 | 2016 | |
| 81 | Glenn Harvell | 3.135 | 2015 | |
| 82 | Roland Bucholtz# | 3.141 | 2032 | |
| 83 | Marvin Chavarria | 3.148 | 2017 | |
| 84 | Charles Olaughlin | 3.149 | 2014 | |
| 85 | Shawn Henry# | 3.154 | 2029 | |
| 86 | Carlos Salazar# | 3.164 | 2035 | |
| 87 | Shawn Schneider | 3.173 | 2029 | |
| 88 | Floyd Crown | 3.176 | 2018 | |
| 89 | Stephen Tedford | 3.180 | 2013 | |
| 90 | John Hoffman | 3.182 | 2018 | |
| 91 | Willian Stewart | 3.199 | 2019 | |
| 92 | Tony Zavala | 3.200 | 2015 | |
| 93 | Yunosuke Jouon# | 3.207 | 2034 | |
| 94 | Kenneth Hanson | 3.214 | 2021 | |
| 95 | Carl Shepherd | 3.216 | 2014 | |
| 95 | Paul Reed# | 3.216 | 2034 | |
| 97 | Tony Zavala | 3.217 | 2021 | |
| 98 | Guillermo Romero# | 3.219 | 2032 | |
| 99 | Matthew Cassity | 3.225 | 2014 | |
| 100 | Júlio Acosta# | 3.238 | 2023 |
