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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 | Mark Tucker | 2.323 | 2020 | |
| 12 | Atila Freska# | 2.404 | 2027 | |
| 13 | Stanley Williams | 2.408 | 2016 | |
| 14 | Mark Bell | 2.426 | 2024 | |
| 15 | Joel Farrell# | 2.462 | 2032 | |
| 16 | Oswaldo Mobray | 2.469 | 2024 | |
| 17 | Ma Hon Keung# | 2.481 | 2027 | |
| 18 | Travis Carson | 2.489 | 2021 | |
| 19 | Joe Dow | 2.526 | 2022 | |
| 20 | Glen Holland | 2.541 | 2024 | |
| 21 | Paco Peña | 2.565 | 2025 | |
| 22 | Luis Hernández# | 2.579 | 2024 | |
| 23 | Clay Pryor# | 2.589 | 2032 | |
| 24 | Wilson Vélez | 2.630 | 2021 | |
| 25 | John Fowler | 2.660 | 2022 | |
| 26 | Miguel López# | 2.678 | 2027 | |
| 27 | Roberto Covas | 2.692 | 2025 | |
| 28 | Pedro Cervantes | 2.694 | 2022 | |
| 29 | Shawn Arnold | 2.695 | 2022 | |
| 30 | Carlos Garza# | 2.708 | 2025 | |
| 31 | José Maestas | 2.718 | 2026 | |
| 32 | Song-saeng Kim | 2.726 | 2027 | |
| 33 | José Vélez# | 2.742 | 2034 | |
| 34 | Elroy Thompkins# | 2.744 | 2027 | |
| 35 | Benjamin Busto# | 2.763 | 2028 | |
| 36 | José Guillén# | 2.765 | 2027 | |
| 37 | Mark Tucker | 2.767 | 2021 | |
| 38 | Sam Schultz | 2.793 | 2031 | |
| 39 | Louis McDowell | 2.814 | 2027 | |
| 40 | Tadeo Pico# | 2.822 | 2032 | |
| 41 | Mick Alston# | 2.838 | 2028 | |
| 42 | Cisco Ortíz# | 2.842 | 2025 | |
| 42 | Phil Miller | 2.842 | 2024 | |
| 44 | Júlio Vázquez | 2.883 | 2028 | |
| 45 | Frank Walker | 2.887 | 2020 | |
| 46 | Joe Griffin | 2.890 | 2025 | |
| 47 | Pedro Herrera# | 2.903 | 2032 | |
| 48 | Antenor Elizalde | 2.904 | 2027 | |
| 49 | César Soto# | 2.910 | 2035 | |
| 50 | Hong-bin Hua# | 2.931 | 2032 | |
| 51 | Elroy Thompkins# | 2.941 | 2026 | |
| 52 | Curt Tate | 2.954 | 2021 | |
| 53 | Doran Turchin | 2.961 | 2030 | |
| 54 | Carlos Méndez | 2.966 | 2021 | |
| 55 | Tom Hernández | 2.979 | 2021 | |
| 56 | Rubén Sánchez | 2.981 | 2027 | |
| 57 | Ashley Keetley# | 3.000 | 2035 | |
| 57 | Zach Williams Jr. | 3.000 | 2020 | |
| 59 | Igarashi Momoru | 3.015 | 2034 | |
| 60 | Ryan McCall | 3.016 | 2022 | |
| 61 | Bartolo Ramírez | 3.019 | 2021 | |
| 62 | Charles Dobson# | 3.036 | 2022 | |
| 63 | Lester Sullivan | 3.043 | 2021 | |
| 64 | Stanley Kent# | 3.058 | 2032 | |
| 64 | Jorge Rivas | 3.058 | 2018 | |
| 66 | Yoriyoshi Yoshimura | 3.064 | 2028 | |
| 67 | Dusty Fox# | 3.068 | 2033 | |
| 68 | Fernando Ramírez# | 3.076 | 2025 | |
| 68 | César Albó# | 3.076 | 2028 | |
| 70 | Bryan Boyd | 3.083 | 2024 | |
| 71 | Victor de Meij# | 3.084 | 2026 | |
| 72 | Gunnar Hoglund# | 3.099 | 2034 | |
| 73 | William MacKnight | 3.100 | 2021 | |
| 74 | Pedro Romero | 3.110 | 2023 | |
| 75 | Dusty Fox# | 3.115 | 2034 | |
| 76 | Juan Ordóñez# | 3.118 | 2027 | |
| 77 | Héctor Aguilar | 3.122 | 2029 | |
| 78 | Paul Addison# | 3.130 | 2029 | |
| 79 | Jason Ackerman | 3.137 | 2022 | |
| 80 | Archie Erickson# | 3.141 | 2035 | |
| 81 | Filip Radyuhin# | 3.145 | 2030 | |
| 82 | José Gutiérrez | 3.151 | 2025 | |
| 83 | Gary Kellenberger | 3.156 | 2025 | |
| 84 | Wu-shiun Lao# | 3.158 | 2031 | |
| 85 | José Vega | 3.188 | 2027 | |
| 86 | Rudy Jenkins | 3.217 | 2019 | |
| 87 | Héctor Aguilar | 3.240 | 2030 | |
| 88 | Carlos Peret | 3.242 | 2027 | |
| 89 | Oriol Razo | 3.243 | 2030 | |
| 90 | Yoriyoshi Yoshimura | 3.245 | 2029 | |
| 91 | Wop Baars# | 3.252 | 2031 | |
| 92 | Alex Simmons | 3.253 | 2022 | |
| 93 | José Blanco# | 3.262 | 2034 | |
| 94 | Valentín Robles | 3.264 | 2027 | |
| 95 | Jorge Carrión | 3.269 | 2022 | |
| 95 | Cisco Romero | 3.269 | 2020 | |
| 97 | Juan Moreno# | 3.271 | 2035 | |
| 97 | Jeff Seawright# | 3.271 | 2034 | |
| 99 | Érico Laborde# | 3.278 | 2030 | |
| 100 | Eric Taylor | 3.285 | 2020 |
