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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Carl Bean | 0.000 | 2044 | |
| 2 | Floyd Rivera | 0.551 | 2044 | |
| 2 | David Moreno# | 0.551 | 2051 | |
| 4 | Bill McConnell | 0.587 | 2016 | |
| 5 | Júlio Caraballo | 0.614 | 2029 | |
| 6 | Wynn Thompson | 0.915 | 2030 | |
| 7 | Miguel Chávez | 0.982 | 2031 | |
| 8 | Toby Valentín# | 1.000 | 2050 | |
| 9 | Ben George | 1.059 | 2031 | |
| 10 | Wynn Thompson | 1.080 | 2032 | |
| 11 | Jack Sandford | 1.125 | 2032 | |
| 12 | Rick Dooley | 1.174 | 2027 | |
| 13 | Juan Mendoza# | 1.200 | 2051 | |
| 14 | Bob Powell | 1.227 | 2025 | |
| 15 | Jean-François Massicotte | 1.446 | 2032 | |
| 16 | Ken Hayes | 1.612 | 2029 | |
| 17 | Edward Barnes# | 1.653 | 2047 | |
| 18 | Jared Bergeron# | 1.688 | 2049 | |
| 18 | Miguel Angel Enríquez# | 1.688 | 2041 | |
| 20 | Dan MacGruder | 1.761 | 2020 | |
| 21 | David Núñez | 1.875 | 2024 | |
| 22 | Carl Bean | 1.929 | 2043 | |
| 22 | David Núñez | 1.929 | 2025 | |
| 24 | Jack Sandford | 2.118 | 2033 | |
| 25 | Eugene Woods | 2.160 | 2032 | |
| 26 | Matt Thomas# | 2.204 | 2045 | |
| 27 | Kelly Hanes# | 2.250 | 2046 | |
| 28 | Oriol Jaramillo | 2.411 | 2012 | |
| 29 | Junior Ryan | 2.418 | 2031 | |
| 29 | Nick Myers# | 2.418 | 2045 | |
| 31 | Richard Davis | 2.531 | 2024 | |
| 32 | Rory Taverner | 2.571 | 2022 | |
| 33 | Gene Sanders | 2.700 | 2016 | |
| 34 | Bill Tucker | 2.805 | 2027 | |
| 35 | Jeffrey Gómez | 2.864 | 2039 | |
| 36 | Nick Coomer | 2.893 | 2032 | |
| 37 | Brian Campbell | 2.935 | 2039 | |
| 38 | Fernão Ega# | 3.000 | 2051 | |
| 39 | Juan Castro# | 3.048 | 2044 | |
| 40 | Tommy Long | 3.115 | 2024 | |
| 41 | Donald Moore | 3.176 | 2029 | |
| 42 | Henry Valentine | 3.203 | 2019 | |
| 43 | Jason Wilkerson | 3.240 | 2016 | |
| 44 | David Núñez | 3.284 | 2023 | |
| 45 | Hidehira Kikuchi# | 3.375 | 2045 | |
| 46 | Bill Wall | 3.436 | 2030 | |
| 47 | Vernon Johnson | 3.484 | 2038 | |
| 47 | Terry Ramsey | 3.484 | 2015 | |
| 49 | Mike Conroy | 3.506 | 2022 | |
| 50 | Peter Carter | 3.712 | 2025 | |
| 51 | Rory Taverner | 3.738 | 2021 | |
| 52 | Jack Robinson | 3.913 | 2029 | |
| 53 | Jeffrey Gómez | 3.927 | 2027 | |
| 54 | Bill Spracklin | 3.938 | 2036 | |
| 55 | Francisco Andrés# | 4.021 | 2046 | |
| 56 | Duane Pérez | 4.109 | 2033 | |
| 57 | Todd Thorp | 4.200 | 2033 | |
| 58 | Bret Beatty# | 4.235 | 2047 | |
| 59 | José Rajas | 4.673 | 2023 | |
| 60 | Ernie Simmons# | 4.696 | 2038 | |
| 61 | Jeffrey Wall | 4.800 | 2024 | |
| 62 | Avery Hutchins | 4.860 | 2035 | |
| 63 | Wynn Thompson | 4.909 | 2029 | |
| 64 | Lee Lynch | 5.121 | 2016 | |
| 65 | Joe Welch | 5.684 | 2019 | |
| 66 | Javier Escobar | 5.940 | 2019 | |
| 67 | Barrett Dobson | 6.097 | 2033 |
