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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Art Adams | 0.000 | 2030 | |
| 2 | Dave Tomlinson | 0.342 | 2021 | |
| 3 | Carlos Sánchez | 0.443 | 2027 | |
| 4 | Héctor Alarcon | 0.529 | 2017 | |
| 5 | Darryl Gordon | 0.540 | 2018 | |
| 6 | Adrián Fierro | 0.551 | 2026 | |
| 7 | John Holley | 0.562 | 2016 | |
| 8 | Dave Tomlinson | 0.574 | 2020 | |
| 8 | António Castillo | 0.574 | 2027 | |
| 10 | Roberto Ortega | 0.600 | 2018 | |
| 10 | Sexto Rodríguez | 0.600 | 2020 | |
| 10 | Víctor Padilla | 0.600 | 2018 | |
| 10 | Darweshi Hadiya# | 0.600 | 2034 | |
| 10 | Kevin Nogilny# | 0.600 | 2032 | |
| 15 | George Frazier | 0.871 | 2028 | |
| 16 | Steve Seabolt | 0.931 | 2033 | |
| 17 | Shigemasa Horiuchi* | 0.964 | 2021 | |
| 18 | Tyler MacHugh | 0.982 | 2032 | |
| 19 | Juan Guillén# | 0.991 | 2026 | |
| 20 | Armando Martínez | 1.012 | 2020 | |
| 21 | Charles Dobson | 1.019 | 2024 | |
| 22 | Shunen Takahashi | 1.080 | 2028 | |
| 22 | David Buchanan# | 1.080 | 2032 | |
| 24 | Leslie Brooks | 1.095 | 2023 | |
| 25 | Ryan Peterson | 1.102 | 2028 | |
| 26 | José Galindo | 1.125 | 2015 | |
| 26 | Alfredo Trejo | 1.125 | 2018 | |
| 26 | Bill Prowse | 1.125 | 2020 | |
| 26 | Jason Starkey# | 1.125 | 2037 | |
| 26 | Darryl Gordon | 1.125 | 2019 | |
| 31 | Joy-shan Men# | 1.149 | 2037 | |
| 32 | Jeff Reynolds | 1.174 | 2019 | |
| 33 | Luis Peña | 1.191 | 2030 | |
| 34 | Brantford Winstworth III# | 1.200 | 2037 | |
| 34 | Brian Wheeler | 1.200 | 2024 | |
| 36 | Eric Matson# | 1.209 | 2027 | |
| 37 | Gary Bailey | 1.227 | 2017 | |
| 38 | Yusuke Chikafuji | 1.266 | 2028 | |
| 39 | Rusty Williamson | 1.286 | 2018 | |
| 40 | Raneem Zogby# | 1.373 | 2033 | |
| 41 | Dale Hamilton# | 1.421 | 2030 | |
| 42 | Carlos Sánchez | 1.486 | 2024 | |
| 43 | Rémi Ribeiro# | 1.528 | 2033 | |
| 44 | Alfonso Zapata | 1.534 | 2025 | |
| 45 | Mathies Pilegaard | 1.543 | 2017 | |
| 46 | Billy Crawford | 1.558 | 2023 | |
| 47 | William Johnson | 1.565 | 2016 | |
| 48 | Kevin Nogilny# | 1.604 | 2035 | |
| 49 | Jon Briddon | 1.620 | 2023 | |
| 50 | Miguel Castillo | 1.653 | 2016 | |
| 51 | Roderick Rhodes | 1.662 | 2017 | |
| 52 | Michael Machen# | 1.688 | 2031 | |
| 52 | Rich Hunter | 1.688 | 2017 | |
| 52 | Willie Dustice# | 1.688 | 2034 | |
| 52 | Yeon-kyu Kim# | 1.688 | 2034 | |
| 52 | Stewart Fleming | 1.688 | 2031 | |
| 57 | Félix Jiménez | 1.709 | 2024 | |
| 58 | Henry Hall | 1.714 | 2017 | |
| 59 | Russ Horne# | 1.723 | 2027 | |
| 59 | Eduardo Molina | 1.723 | 2024 | |
| 61 | Fernando Espinosa | 1.770 | 2031 | |
| 61 | Raúl Areola | 1.770 | 2027 | |
| 63 | Juan Pérez | 1.800 | 2021 | |
| 64 | Kazu Omori | 1.862 | 2032 | |
| 65 | Cris Herrera | 1.884 | 2025 | |
| 66 | Markus Widner# | 1.929 | 2036 | |
| 67 | Pedro Alejándrez | 1.952 | 2020 | |
| 68 | Shigemasa Horiuchi* | 1.964 | 2030 | |
| 68 | Walt Coffman | 1.964 | 2029 | |
| 70 | Leslie Brooks | 2.000 | 2022 | |
| 70 | Félix Jiménez | 2.000 | 2025 | |
| 72 | Zalontae Hillary# | 2.051 | 2038 | |
| 73 | Sexto Rodríguez | 2.077 | 2017 | |
| 73 | Jay Cannon# | 2.077 | 2039 | |
| 73 | Randy Hoffman | 2.077 | 2021 | |
| 76 | Eddie Kop# | 2.100 | 2036 | |
| 77 | Peter Rivers | 2.104 | 2019 | |
| 78 | Tyler MacHugh | 2.118 | 2025 | |
| 79 | Octavius Pringle# | 2.143 | 2032 | |
| 80 | Enrique Castro | 2.153 | 2030 | |
| 81 | Natalino Golaio# | 2.160 | 2038 | |
| 82 | Jeff Mahl# | 2.182 | 2035 | |
| 83 | Tetsuzan Kaneko | 2.189 | 2023 | |
| 83 | Davis Sawyer# | 2.189 | 2035 | |
| 85 | David Buchanan# | 2.213 | 2031 | |
| 85 | Pedro Ritodíaz | 2.213 | 2016 | |
| 87 | Clemente Prista | 2.224 | 2018 | |
| 88 | Austin Stewart | 2.250 | 2026 | |
| 88 | Zalontae Hillary# | 2.250 | 2037 | |
| 90 | Shigemasa Horiuchi* | 2.314 | 2019 | |
| 91 | Armando Romano# | 2.328 | 2036 | |
| 91 | Michael Machen# | 2.328 | 2036 | |
| 93 | Ronald Harmon | 2.333 | 2018 | |
| 93 | Bill Fletcher | 2.333 | 2026 | |
| 95 | Raúl Melro | 2.337 | 2028 | |
| 96 | José Rico | 2.348 | 2027 | |
| 96 | Maru Pao Pao# | 2.348 | 2032 | |
| 96 | Ronald Harmon | 2.348 | 2017 | |
| 99 | Wop Baars# | 2.368 | 2038 | |
| 99 | Jorge Garza | 2.368 | 2024 |
