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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 | Will Hunting | 0.491 | 2041 | |
| 5 | Héctor Alarcon | 0.529 | 2017 | |
| 6 | Darryl Gordon | 0.540 | 2018 | |
| 7 | Adrián Fierro | 0.551 | 2026 | |
| 8 | John Holley | 0.562 | 2016 | |
| 9 | António Castillo | 0.574 | 2027 | |
| 9 | Dave Tomlinson | 0.574 | 2020 | |
| 11 | Luis Gutiérrez# | 0.587 | 2053 | |
| 12 | Roberto Ortega | 0.600 | 2018 | |
| 12 | Gordon Benjamin# | 0.600 | 2055 | |
| 12 | Sexto Rodríguez | 0.600 | 2020 | |
| 12 | Kevin Nogilny | 0.600 | 2032 | |
| 12 | Víctor Padilla | 0.600 | 2018 | |
| 12 | Darweshi Hadiya | 0.600 | 2034 | |
| 18 | Cheol-han Cho# | 0.667 | 2054 | |
| 19 | Indigo Diaz | 0.818 | 2043 | |
| 20 | George Frazier | 0.871 | 2028 | |
| 21 | Steve Seabolt | 0.931 | 2033 | |
| 22 | Shigemasa Horiuchi* | 0.964 | 2021 | |
| 23 | Tyler MacHugh | 0.982 | 2032 | |
| 24 | Juan Guillén* | 0.991 | 2026 | |
| 25 | Armando Martínez | 1.012 | 2020 | |
| 26 | Charles Dobson | 1.019 | 2024 | |
| 26 | Rafael Trujillo# | 1.019 | 2053 | |
| 28 | Jorge Carranza# | 1.038 | 2052 | |
| 29 | David Buchanan | 1.080 | 2032 | |
| 29 | Shunen Takahashi | 1.080 | 2028 | |
| 29 | Rich Baker# | 1.080 | 2051 | |
| 32 | Leslie Brooks | 1.095 | 2023 | |
| 33 | Ryan Peterson | 1.102 | 2028 | |
| 34 | Bill Prowse | 1.125 | 2020 | |
| 34 | Jason Starkey | 1.125 | 2037 | |
| 34 | Alfredo Trejo | 1.125 | 2018 | |
| 34 | José Galindo | 1.125 | 2015 | |
| 34 | Darryl Gordon | 1.125 | 2019 | |
| 39 | Joy-shan Men | 1.149 | 2037 | |
| 39 | Amin Yahouse# | 1.149 | 2043 | |
| 39 | Jim Harris | 1.149 | 2051 | |
| 42 | Paul Vereen | 1.174 | 2046 | |
| 42 | Jeff Reynolds | 1.174 | 2019 | |
| 44 | Luis Peña | 1.191 | 2030 | |
| 45 | Brantford Winstworth III | 1.200 | 2037 | |
| 45 | Hengkie Iriawan | 1.200 | 2040 | |
| 45 | Brian Wheeler | 1.200 | 2024 | |
| 48 | Eric Matson* | 1.209 | 2027 | |
| 48 | Ricky Sellers | 1.209 | 2041 | |
| 50 | Gary Bailey* | 1.227 | 2017 | |
| 51 | Yusuke Chikafuji | 1.266 | 2028 | |
| 52 | Rusty Williamson | 1.286 | 2018 | |
| 52 | Janghyun Han# | 1.286 | 2047 | |
| 54 | Volmer Aalbers# | 1.306 | 2051 | |
| 54 | Ramón Barrueco | 1.306 | 2044 | |
| 56 | Raneem Zogby | 1.373 | 2033 | |
| 56 | Yaichiro Shini# | 1.373 | 2052 | |
| 56 | José Martínez# | 1.373 | 2051 | |
| 59 | Dale Hamilton | 1.421 | 2030 | |
| 60 | Alton Westrich | 1.440 | 2043 | |
| 61 | Ratko Peric | 1.467 | 2049 | |
| 62 | Gregory Collins# | 1.484 | 2054 | |
| 63 | Carlos Sánchez | 1.486 | 2024 | |
| 64 | Kenny Aarnoutse | 1.500 | 2041 | |
| 65 | Rémi Ribeiro | 1.528 | 2033 | |
| 66 | Alfonso Zapata | 1.534 | 2025 | |
| 67 | Mathies Pilegaard | 1.543 | 2017 | |
| 68 | Billy Crawford | 1.558 | 2023 | |
| 69 | William Johnson | 1.565 | 2016 | |
| 70 | Shem Burkholder | 1.588 | 2051 | |
| 71 | Kevin Nogilny | 1.604 | 2035 | |
| 72 | Jon Briddon | 1.620 | 2023 | |
| 73 | Miguel Castillo | 1.653 | 2016 | |
| 74 | Roderick Rhodes | 1.662 | 2017 | |
| 75 | Rod Watts | 1.688 | 2041 | |
| 75 | Willie Dustice | 1.688 | 2034 | |
| 75 | Rich Hunter | 1.688 | 2017 | |
| 75 | Michael Machen* | 1.688 | 2031 | |
| 75 | Yeon-kyu Kim | 1.688 | 2034 | |
| 75 | Stewart Fleming | 1.688 | 2031 | |
| 81 | Félix Jiménez | 1.709 | 2024 | |
| 82 | Henry Hall | 1.714 | 2017 | |
| 83 | Russ Horne | 1.723 | 2027 | |
| 83 | Eduardo Molina | 1.723 | 2024 | |
| 85 | Archie MacMurchy# | 1.734 | 2052 | |
| 86 | Anthony Carney# | 1.742 | 2050 | |
| 87 | Paul Haines | 1.761 | 2050 | |
| 88 | Fernando Espinosa | 1.770 | 2031 | |
| 88 | Raúl Areola | 1.770 | 2027 | |
| 88 | Lance Barber | 1.770 | 2044 | |
| 91 | Juan Pérez | 1.800 | 2021 | |
| 92 | Craig Fitzgerald | 1.820 | 2040 | |
| 93 | Doug Santamarina# | 1.824 | 2052 | |
| 94 | Alex Wilson# | 1.831 | 2055 | |
| 95 | Kazu Omori | 1.862 | 2032 | |
| 96 | Cris Herrera | 1.884 | 2025 | |
| 97 | Markus Widner | 1.929 | 2036 | |
| 98 | Pedro Alejándrez* | 1.952 | 2020 | |
| 99 | Dave Becker | 1.957 | 2044 | |
| 100 | Shigemasa Horiuchi* | 1.964 | 2030 |
