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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Hartmann Riedman | 1.449 | 2025 | |
| 2 | Roberto Calderón | 1.839 | 2024 | |
| 3 | Enrique Castro | 1.910 | 2028 | |
| 4 | Javier Roldán | 1.970 | 2022 | |
| 5 | Miguel López | 2.055 | 2028 | |
| 6 | Noburo Oishi | 2.071 | 2028 | |
| 7 | Carlos Sánchez | 2.077 | 2020 | |
| 8 | José Cabrera | 2.092 | 2028 | |
| 9 | Kostas Antetokounmpo# | 2.120 | 2028 | |
| 10 | Larry Neal | 2.186 | 2020 | |
| 11 | Cristóbal Román | 2.244 | 2037 | |
| 12 | Zi-cheng Pei# | 2.298 | 2040 | |
| 13 | Mark Tucker | 2.323 | 2020 | |
| 14 | Cameron Thoresen# | 2.378 | 2039 | |
| 15 | Jared LaBarge# | 2.396 | 2038 | |
| 16 | Atila Freska | 2.404 | 2027 | |
| 17 | Stanley Williams | 2.408 | 2016 | |
| 18 | Sam Johnston | 2.409 | 2038 | |
| 19 | Mark Bell | 2.426 | 2024 | |
| 20 | Joel Farrell | 2.462 | 2032 | |
| 21 | Oswaldo Mobray | 2.469 | 2024 | |
| 22 | Ma Hon Keung | 2.481 | 2027 | |
| 23 | Travis Carson | 2.489 | 2021 | |
| 24 | Joe Dow | 2.526 | 2022 | |
| 25 | Glen Holland | 2.541 | 2024 | |
| 26 | Paco Peńa | 2.565 | 2025 | |
| 27 | Luis Hernández | 2.579 | 2024 | |
| 28 | Jesús Castillo# | 2.584 | 2038 | |
| 29 | Clay Pryor | 2.589 | 2032 | |
| 30 | Wilson Vélez | 2.630 | 2021 | |
| 31 | Mick Alston | 2.657 | 2036 | |
| 32 | John Fowler | 2.660 | 2022 | |
| 33 | Miguel López | 2.678 | 2027 | |
| 34 | Roberto Covas | 2.692 | 2025 | |
| 34 | Cameron Thoresen# | 2.692 | 2038 | |
| 36 | Pedro Cervantes | 2.694 | 2022 | |
| 37 | Shawn Arnold | 2.695 | 2022 | |
| 38 | Carlos Garza | 2.708 | 2025 | |
| 39 | José Maestas | 2.718 | 2026 | |
| 40 | Song-saeng Kim | 2.726 | 2027 | |
| 41 | José Vélez | 2.742 | 2034 | |
| 41 | Gerald Emerson# | 2.742 | 2039 | |
| 43 | Elroy Thompkins# | 2.744 | 2027 | |
| 44 | Benjamin Busto | 2.763 | 2028 | |
| 45 | José Guillén | 2.765 | 2027 | |
| 46 | Mark Tucker | 2.767 | 2021 | |
| 47 | Sam Schultz | 2.793 | 2031 | |
| 47 | Alton Westrich# | 2.793 | 2040 | |
| 49 | Andy Williams# | 2.796 | 2039 | |
| 50 | Alton Westrich# | 2.812 | 2039 | |
| 51 | Louis McDowell | 2.814 | 2027 | |
| 52 | Tadeo Pico | 2.822 | 2032 | |
| 53 | Mick Alston | 2.838 | 2028 | |
| 54 | Phil Miller | 2.842 | 2024 | |
| 54 | Cisco Ortíz | 2.842 | 2025 | |
| 56 | Eric Manchester# | 2.865 | 2039 | |
| 57 | Júlio Vázquez | 2.883 | 2028 | |
| 58 | Frank Walker | 2.887 | 2020 | |
| 59 | Joe Griffin | 2.890 | 2025 | |
| 60 | Pedro Herrera# | 2.903 | 2032 | |
| 61 | Antenor Elizalde | 2.904 | 2027 | |
| 62 | César Soto# | 2.910 | 2035 | |
| 63 | Hong-bin Hua# | 2.931 | 2032 | |
| 64 | Elroy Thompkins# | 2.941 | 2026 | |
| 65 | Curt Tate | 2.954 | 2021 | |
| 66 | Doran Turchin | 2.961 | 2030 | |
| 67 | Carlos Méndez | 2.966 | 2021 | |
| 68 | Tom Hernández | 2.979 | 2021 | |
| 69 | Rubén Sánchez | 2.981 | 2027 | |
| 69 | Andy Fallon | 2.981 | 2037 | |
| 71 | Ashley Keetley | 3.000 | 2035 | |
| 71 | Zach Williams Jr. | 3.000 | 2020 | |
| 73 | Igarashi Momoru | 3.015 | 2034 | |
| 74 | Ryan McCall | 3.016 | 2022 | |
| 75 | Bartolo Ramírez | 3.019 | 2021 | |
| 76 | Charles Dobson | 3.036 | 2022 | |
| 77 | Lester Sullivan | 3.043 | 2021 | |
| 78 | Jorge Moreno# | 3.050 | 2038 | |
| 79 | Stanley Kent# | 3.058 | 2032 | |
| 79 | Jorge Rivas | 3.058 | 2018 | |
| 81 | Yoriyoshi Yoshimura | 3.064 | 2028 | |
| 82 | Dusty Fox# | 3.068 | 2033 | |
| 83 | Fernando Ramírez | 3.076 | 2025 | |
| 83 | César Albó# | 3.076 | 2028 | |
| 85 | Bryan Boyd | 3.083 | 2024 | |
| 86 | Victor de Meij | 3.084 | 2026 | |
| 87 | Gunnar Hoglund# | 3.099 | 2034 | |
| 88 | William MacKnight | 3.100 | 2021 | |
| 89 | Pedro Romero | 3.110 | 2023 | |
| 90 | Dusty Fox# | 3.115 | 2034 | |
| 91 | Juan Ordóńez | 3.118 | 2027 | |
| 92 | Héctor Aguilar | 3.122 | 2029 | |
| 93 | Paul Addison | 3.130 | 2029 | |
| 94 | Jason Ackerman | 3.137 | 2022 | |
| 95 | Archie Erickson | 3.141 | 2035 | |
| 96 | Jackson Williams# | 3.142 | 2039 | |
| 97 | Filip Radyuhin | 3.145 | 2030 | |
| 98 | José Gutiérrez | 3.151 | 2025 | |
| 99 | Gary Kellenberger | 3.156 | 2025 | |
| 100 | Wu-shiun Lao# | 3.158 | 2031 |
