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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 | Dave Tomlinson | 0.574 | 2020 | |
| 9 | António Castillo | 0.574 | 2027 | |
| 11 | Roberto Ortega | 0.600 | 2018 | |
| 11 | Víctor Padilla | 0.600 | 2018 | |
| 11 | Darweshi Hadiya# | 0.600 | 2034 | |
| 11 | Sexto Rodríguez | 0.600 | 2020 | |
| 11 | Kevin Nogilny# | 0.600 | 2032 | |
| 16 | George Frazier | 0.871 | 2028 | |
| 17 | Steve Seabolt | 0.931 | 2033 | |
| 18 | Shigemasa Horiuchi* | 0.964 | 2021 | |
| 19 | Tyler MacHugh | 0.982 | 2032 | |
| 20 | Juan Guillén | 0.991 | 2026 | |
| 21 | Armando Martínez | 1.012 | 2020 | |
| 22 | Charles Dobson | 1.019 | 2024 | |
| 23 | Shunen Takahashi | 1.080 | 2028 | |
| 23 | David Buchanan# | 1.080 | 2032 | |
| 25 | Leslie Brooks | 1.095 | 2023 | |
| 26 | Ryan Peterson | 1.102 | 2028 | |
| 27 | José Galindo | 1.125 | 2015 | |
| 27 | Bill Prowse | 1.125 | 2020 | |
| 27 | Darryl Gordon | 1.125 | 2019 | |
| 27 | Jason Starkey# | 1.125 | 2037 | |
| 27 | Alfredo Trejo | 1.125 | 2018 | |
| 32 | Joy-shan Men# | 1.149 | 2037 | |
| 33 | Jeff Reynolds | 1.174 | 2019 | |
| 34 | Luis Peña | 1.191 | 2030 | |
| 35 | Brantford Winstworth III# | 1.200 | 2037 | |
| 35 | Hengkie Iriawan# | 1.200 | 2040 | |
| 35 | Brian Wheeler | 1.200 | 2024 | |
| 38 | Ricky Sellers# | 1.209 | 2041 | |
| 38 | Eric Matson | 1.209 | 2027 | |
| 40 | Gary Bailey | 1.227 | 2017 | |
| 41 | Yusuke Chikafuji | 1.266 | 2028 | |
| 42 | Rusty Williamson | 1.286 | 2018 | |
| 43 | Raneem Zogby# | 1.373 | 2033 | |
| 44 | Dale Hamilton# | 1.421 | 2030 | |
| 45 | Carlos Sánchez | 1.486 | 2024 | |
| 46 | Kenny Aarnoutse# | 1.500 | 2041 | |
| 47 | Rémi Ribeiro# | 1.528 | 2033 | |
| 48 | Alfonso Zapata | 1.534 | 2025 | |
| 49 | Mathies Pilegaard | 1.543 | 2017 | |
| 50 | Billy Crawford | 1.558 | 2023 | |
| 51 | William Johnson | 1.565 | 2016 | |
| 52 | Kevin Nogilny# | 1.604 | 2035 | |
| 53 | Jon Briddon | 1.620 | 2023 | |
| 54 | Miguel Castillo | 1.653 | 2016 | |
| 55 | Roderick Rhodes | 1.662 | 2017 | |
| 56 | Michael Machen | 1.688 | 2031 | |
| 56 | Rod Watts# | 1.688 | 2041 | |
| 56 | Willie Dustice | 1.688 | 2034 | |
| 56 | Stewart Fleming | 1.688 | 2031 | |
| 56 | Rich Hunter | 1.688 | 2017 | |
| 56 | Yeon-kyu Kim | 1.688 | 2034 | |
| 62 | Félix Jiménez | 1.709 | 2024 | |
| 63 | Henry Hall | 1.714 | 2017 | |
| 64 | Eduardo Molina | 1.723 | 2024 | |
| 64 | Russ Horne | 1.723 | 2027 | |
| 66 | Fernando Espinosa | 1.770 | 2031 | |
| 66 | Raúl Areola | 1.770 | 2027 | |
| 68 | Juan Pérez | 1.800 | 2021 | |
| 69 | Craig Fitzgerald# | 1.820 | 2040 | |
| 70 | Kazu Omori | 1.862 | 2032 | |
| 71 | Cris Herrera | 1.884 | 2025 | |
| 72 | Markus Widner# | 1.929 | 2036 | |
| 73 | Pedro Alejándrez* | 1.952 | 2020 | |
| 74 | Shigemasa Horiuchi* | 1.964 | 2030 | |
| 74 | Walt Coffman | 1.964 | 2029 | |
| 76 | Leslie Brooks | 2.000 | 2022 | |
| 76 | Félix Jiménez | 2.000 | 2025 | |
| 78 | Zalontae Hillary# | 2.051 | 2038 | |
| 79 | Jay Cannon# | 2.077 | 2039 | |
| 79 | Sexto Rodríguez | 2.077 | 2017 | |
| 79 | Randy Hoffman | 2.077 | 2021 | |
| 82 | Eddie Kop | 2.100 | 2036 | |
| 83 | Peter Rivers | 2.104 | 2019 | |
| 84 | Tyler MacHugh | 2.118 | 2025 | |
| 85 | Octavius Pringle# | 2.143 | 2032 | |
| 85 | Craig Fitzgerald# | 2.143 | 2042 | |
| 87 | Enrique Castro | 2.153 | 2030 | |
| 88 | Natalino Golaio | 2.160 | 2038 | |
| 89 | Jeff Mahl# | 2.182 | 2035 | |
| 90 | Davis Sawyer# | 2.189 | 2035 | |
| 90 | Tetsuzan Kaneko | 2.189 | 2023 | |
| 92 | David Buchanan# | 2.213 | 2031 | |
| 92 | Pedro Ritodíaz | 2.213 | 2016 | |
| 94 | Clemente Prista | 2.224 | 2018 | |
| 95 | Zalontae Hillary# | 2.250 | 2037 | |
| 95 | Austin Stewart | 2.250 | 2026 | |
| 95 | Jared LaBarge# | 2.250 | 2041 | |
| 98 | Jeffery Meyers# | 2.298 | 2041 | |
| 98 | Esteban Rodríguez# | 2.298 | 2040 | |
| 100 | Shigemasa Horiuchi* | 2.314 | 2019 |
