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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Ismael Barrios | 0.000 | 2026 | |
| 1 | Ryan Davis* | 0.000 | 2015 | |
| 1 | Jorge Aguirre* | 0.000 | 2029 | |
| 1 | Jesús Caldero | 0.000 | 2020 | |
| 5 | Melvin Tiburcio# | 0.474 | 2037 | |
| 6 | Juan Torres | 0.509 | 2023 | |
| 7 | Kent Good# | 0.514 | 2040 | |
| 8 | Juan Valéncia | 0.519 | 2025 | |
| 9 | Torvald Geertsen | 0.529 | 2018 | |
| 10 | Yoriyoshi Yamamoto | 0.540 | 2016 | |
| 11 | Dusty Fox# | 0.562 | 2039 | |
| 12 | Charles Dobson | 0.574 | 2024 | |
| 12 | Job Poppe | 0.574 | 2026 | |
| 14 | Brian Walker | 0.587 | 2031 | |
| 14 | Yuri Volkers | 0.587 | 2019 | |
| 14 | Yin-fat Foong | 0.587 | 2023 | |
| 14 | Fraser Cuevas | 0.587 | 2022 | |
| 14 | Juan Sánchez | 0.587 | 2021 | |
| 19 | Brian Morris | 0.600 | 2030 | |
| 19 | Dave Reed | 0.600 | 2022 | |
| 21 | Todd Hines* | 0.659 | 2021 | |
| 22 | Cordell Wilson | 0.740 | 2025 | |
| 23 | Michael Fletcher | 0.750 | 2021 | |
| 24 | Cordell Wilson | 0.761 | 2026 | |
| 25 | Miguel Rubia | 0.771 | 2038 | |
| 26 | Kyle Lewis | 0.783 | 2020 | |
| 27 | Lúcio Sánchez* | 0.794 | 2024 | |
| 28 | Ramón Molina | 0.818 | 2030 | |
| 29 | Cristián Moreno# | 0.827 | 2038 | |
| 30 | Christian Mustard | 0.831 | 2030 | |
| 31 | Jesús Gonzáles | 0.871 | 2026 | |
| 32 | Pete Nicholls | 0.885 | 2014 | |
| 33 | Júlio Rodríguez | 0.947 | 2031 | |
| 34 | Javier Desdin# | 0.953 | 2031 | |
| 35 | Yajirobei Otomo | 1.000 | 2034 | |
| 35 | Lorenzo Sánchez | 1.000 | 2024 | |
| 37 | Natalino Golaio | 1.019 | 2031 | |
| 38 | Ryan Bentley | 1.038 | 2028 | |
| 38 | Jesús Caldero | 1.038 | 2025 | |
| 38 | Ángel Navarro | 1.038 | 2028 | |
| 41 | Rhys Maskell# | 1.052 | 2037 | |
| 42 | Todd Hines* | 1.059 | 2025 | |
| 42 | Paul Díaz | 1.059 | 2024 | |
| 42 | Stuart Lee | 1.059 | 2021 | |
| 45 | Sam Mooney | 1.066 | 2036 | |
| 46 | Raúl Romero# | 1.080 | 2041 | |
| 47 | Bill Oulton | 1.125 | 2023 | |
| 47 | Cristián Moreno# | 1.125 | 2037 | |
| 47 | Edgardo Marín | 1.125 | 2014 | |
| 47 | Tim Walker# | 1.125 | 2041 | |
| 51 | Kyuichi Hori# | 1.141 | 2040 | |
| 52 | Mark Valle# | 1.174 | 2032 | |
| 52 | Stanley Neal | 1.174 | 2021 | |
| 52 | José Alaniz | 1.174 | 2025 | |
| 55 | Nicky Bogdan# | 1.191 | 2042 | |
| 55 | Eddie Kop | 1.191 | 2029 | |
| 57 | Joy-shan Men# | 1.200 | 2041 | |
| 57 | José Flores | 1.200 | 2024 | |
| 57 | Wayne Hurst | 1.200 | 2021 | |
| 60 | Armando Garay# | 1.213 | 2034 | |
| 61 | An Jang-Yop# | 1.227 | 2032 | |
| 61 | Todd Hines* | 1.227 | 2024 | |
| 61 | John Kaufman* | 1.227 | 2024 | |
| 61 | Piotr Oja | 1.227 | 2031 | |
| 65 | Javier Mora | 1.246 | 2028 | |
| 66 | Curtis Fields | 1.266 | 2023 | |
| 67 | William Johnson | 1.286 | 2016 | |
| 68 | Addie Samson | 1.317 | 2027 | |
| 69 | Gerardo Pagán# | 1.328 | 2038 | |
| 70 | Eduardo Díaz | 1.350 | 2027 | |
| 70 | Todd Hines* | 1.350 | 2022 | |
| 72 | Charles Dobson | 1.403 | 2027 | |
| 73 | Jim Eliott* | 1.406 | 2015 | |
| 74 | Lúcio Sánchez* | 1.421 | 2026 | |
| 75 | Ryan Davis* | 1.434 | 2021 | |
| 76 | Pedro Ortíz | 1.500 | 2024 | |
| 76 | Christian Bates | 1.500 | 2019 | |
| 76 | José Flores | 1.500 | 2025 | |
| 79 | Bob Mullinax | 1.528 | 2034 | |
| 80 | Manuel Rojas | 1.558 | 2022 | |
| 81 | Earnest Casey | 1.562 | 2020 | |
| 82 | Tobías Pérez | 1.588 | 2026 | |
| 83 | Javier Mora | 1.612 | 2027 | |
| 84 | Gabriel Hidalgo | 1.620 | 2025 | |
| 84 | Jesús Franco | 1.620 | 2032 | |
| 84 | Jorge Gil# | 1.620 | 2041 | |
| 87 | Maxime Janssens | 1.636 | 2033 | |
| 88 | Wayne Craig | 1.653 | 2024 | |
| 88 | Juan Torres | 1.653 | 2029 | |
| 90 | Matthew Fallows# | 1.667 | 2041 | |
| 91 | Todd Hines* | 1.673 | 2018 | |
| 92 | Kenny Koehler | 1.688 | 2028 | |
| 92 | John Wilkins* | 1.688 | 2022 | |
| 94 | Alfonso Caballero# | 1.714 | 2042 | |
| 95 | Eddie Kop | 1.723 | 2030 | |
| 96 | Bartolomeu Lio | 1.731 | 2022 | |
| 97 | Ramón Ortega* | 1.742 | 2019 | |
| 98 | Lúcio Sánchez* | 1.753 | 2021 | |
| 99 | Addie Samson | 1.761 | 2029 | |
| 99 | Kent Good# | 1.761 | 2041 |
