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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Manuel Ruíz# | 0.736 | 2043-2046 | |
| 2 | Gavin Blackburn | 0.925 | 2017-2032 | |
| 3 | Anthony Ledesma | 1.113 | 2031-2041 | |
| 4 | Ambrose Randall | 1.144 | 2027-2041 | |
| 5 | Jesús Franco | 1.180 | 2028-2034 | |
| 6 | Jesús Vidro# | 1.413 | 2033-2045 | |
| 7 | Noe Toepfer | 1.467 | 2035-2040 | |
| 8 | Ron Manning | 1.500 | 2029-2040 | |
| 9 | Leroy Moody | 1.512 | 2025-2033 | |
| 10 | John Woods | 1.552 | 2024-2033 | |
| 11 | Tom Reynolds* | 1.588 | 2015-2027 | |
| 12 | John Dempsey | 1.723 | 2022-2036 | |
| 13 | Juan Guillén* | 1.742 | 2027-2039 | |
| 14 | Luis Peña | 1.747 | 2025-2031 | |
| 15 | Roderick Rhodes | 1.752 | 2017-2028 | |
| 16 | Júlio Palma | 1.849 | 2023-2031 | |
| 17 | Lynwood Matos | 1.929 | 2021-2031 | |
| 18 | Won-sup Yang | 1.969 | 2036-2038 | |
| 19 | Rusty Swanson | 2.038 | 2025-2037 | |
| 20 | Víctor García | 2.077 | 2023-2036 | |
| 21 | Dave Dunn# | 2.097 | 2038-2043 | |
| 22 | Bradley Roth | 2.132 | 2032-2042 | |
| 23 | Juan Torres | 2.172 | 2021-2032 | |
| 24 | Dorian Daly | 2.204 | 2028-2036 | |
| 25 | Javier Mora | 2.215 | 2020-2034 | |
| 26 | Marcos Oquendo | 2.250 | 2030-2041 | |
| 27 | Ramón Ortega* | 2.269 | 2015-2024 | |
| 28 | Myles Wilkerson | 2.274 | 2028-2034 | |
| 29 | Austin Stewart | 2.302 | 2021-2030 | |
| 30 | Gustavo Tobías | 2.363 | 2032-2044 | |
| 31 | Pedro Valdéz | 2.394 | 2020-2040 | |
| 32 | Cole Hall | 2.423 | 2016-2027 | |
| 33 | Eric Matson | 2.455 | 2027-2041 | |
| 33 | Gerardo Pagán | 2.455 | 2027-2036 | |
| 35 | Cory Sanders | 2.467 | 2021-2036 | |
| 36 | Reid Garner | 2.469 | 2015-2022 | |
| 37 | Jesús Gonzáles* | 2.477 | 2020-2031 | |
| 38 | John Kaufman* | 2.523 | 2015-2032 | |
| 38 | Leroy Picot | 2.523 | 2021-2027 | |
| 40 | Craig Fitzgerald# | 2.528 | 2036-2046 | |
| 41 | Rook Ellington | 2.538 | 2037-2042 | |
| 42 | Rhys Maskell# | 2.551 | 2035-2045 | |
| 43 | Shigochiyo Tanaka# | 2.558 | 2039-2046 | |
| 44 | Fernando Rivero | 2.571 | 2018-2020 | |
| 45 | Alfonso Zapata | 2.577 | 2020-2032 | |
| 46 | Bobby Swain | 2.586 | 2020-2031 | |
| 47 | Ramón Molina | 2.592 | 2026-2035 | |
| 48 | Jesús Tejeda | 2.613 | 2023-2035 | |
| 49 | Quentin Bowers | 2.647 | 2028-2038 | |
| 50 | Ernest Torres | 2.652 | 2025-2031 | |
| 51 | Eijiro Takahashi | 2.684 | 2028-2034 | |
| 52 | Rex Hood | 2.700 | 2022-2027 | |
| 53 | Lou Meadows | 2.713 | 2016-2027 | |
| 54 | Billy Crawford | 2.716 | 2017-2025 | |
| 55 | Júlio Rodríguez | 2.718 | 2023-2041 | |
| 56 | Eddie Kop | 2.744 | 2023-2042 | |
| 57 | Onson Sweemey | 2.764 | 2033-2045 | |
| 58 | Sylvain Richard# | 2.779 | 2042-2045 | |
| 59 | Jay Newton# | 2.785 | 2042-2046 | |
| 60 | Shuntavyious Primes-Willes | 2.793 | 2025-2035 | |
| 61 | Truman Valentine | 2.821 | 2022-2031 | |
| 62 | Wes Hamm* | 2.828 | 2021-2037 | |
| 63 | Juan Valéncia | 2.856 | 2025-2032 | |
| 64 | Ralph DePalma# | 2.883 | 2036-2046 | |
| 65 | Hunter Wilson | 2.893 | 2019-2031 | |
| 66 | Jeff Mahl | 2.898 | 2035-2046 | |
| 67 | Jorge Otero | 2.900 | 2030-2040 | |
| 68 | Juan Pérez | 2.908 | 2020-2035 | |
| 69 | Javier Roldán | 2.915 | 2025-2032 | |
| 70 | Hong-bin Hua# | 2.925 | 2037-2046 | |
| 71 | Juan Júlio | 2.950 | 2018-2026 | |
| 72 | Bob Warford | 2.953 | 2018-2025 | |
| 73 | Eduardo Molina | 2.956 | 2022-2033 | |
| 74 | Juan Moreno# | 2.965 | 2037-2045 | |
| 75 | Jud White | 2.967 | 2014-2018 | |
| 76 | Pedro Ortíz | 2.970 | 2020-2033 | |
| 77 | Van Hileman# | 2.972 | 2041-2046 | |
| 78 | George Frazier | 2.977 | 2017-2036 | |
| 79 | Zaki Fakhiri# | 2.983 | 2034-2046 | |
| 80 | Vincent Hall | 3.024 | 2021-2031 | |
| 81 | Art Adams | 3.034 | 2020-2031 | |
| 82 | Matt Harris | 3.045 | 2021-2030 | |
| 83 | Lorenzo Sánchez | 3.048 | 2020-2033 | |
| 84 | José Muñóz | 3.057 | 2027-2039 | |
| 85 | Allen Yohemas | 3.059 | 2022-2031 | |
| 86 | Leon von Stroheim | 3.078 | 2034-2042 | |
| 87 | Wayne Craig | 3.094 | 2015-2023 | |
| 88 | Quintiliano Seixal | 3.098 | 2025-2037 | |
| 89 | Bill Oulton | 3.115 | 2021-2033 | |
| 89 | Dale West | 3.115 | 2018-2019 | |
| 91 | Héctor Alarcon | 3.142 | 2015-2027 | |
| 92 | Faisal bin Nabeel | 3.157 | 2034-2041 | |
| 93 | Enrique Valle | 3.162 | 2033-2040 | |
| 94 | Zebulon Vermillion# | 3.176 | 2039-2045 | |
| 95 | Pedro Alejándrez* | 3.186 | 2022-2034 | |
| 96 | Alexis Zambaco | 3.200 | 2028-2038 | |
| 97 | Milutin Panic# | 3.214 | 2040-2046 | |
| 98 | Aurelio López | 3.218 | 2022-2037 | |
| 99 | Jay Cannon# | 3.228 | 2040-2045 | |
| 100 | Gary Ashley# | 3.232 | 2034-2044 |
