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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Ed Mullins# | 1.117 | 2058 | |
| 2 | Gregory Bahena | 1.132 | 2027 | |
| 3 | Nate Jackson | 1.155 | 2032 | |
| 4 | Anastasio Orozco# | 1.162 | 2057 | |
| 5 | Michael Machen* | 1.200 | 2028 | |
| 6 | Osvaldo Garibe | 1.250 | 2027 | |
| 7 | César Rosado | 1.363 | 2023 | |
| 8 | Immeghar Cherono# | 1.369 | 2059 | |
| 9 | Jorge Mejía | 1.385 | 2027 | |
| 10 | Will Moore | 1.425 | 2024 | |
| 11 | Paco Manuel | 1.432 | 2025 | |
| 12 | Archibald Bridgestone | 1.494 | 2023 | |
| 13 | George Kane | 1.505 | 2034 | |
| 14 | John Hottinger | 1.511 | 2028 | |
| 15 | Andrew MacEwen | 1.584 | 2052 | |
| 15 | Dale Hamilton | 1.584 | 2027 | |
| 17 | Job Poppe | 1.599 | 2022 | |
| 18 | Alejandro Araya | 1.619 | 2027 | |
| 19 | Edgardo García# | 1.631 | 2060 | |
| 20 | David Buchanan | 1.634 | 2028 | |
| 21 | Jeff Arocha | 1.662 | 2030 | |
| 22 | Daisuke Maeda | 1.678 | 2046 | |
| 23 | José Rico | 1.688 | 2023 | |
| 24 | Claude Moulin# | 1.692 | 2059 | |
| 25 | Tom Evans | 1.704 | 2053 | |
| 25 | Chuck Franz | 1.704 | 2055 | |
| 25 | Said Akimi | 1.704 | 2037 | |
| 28 | Vernon Álvarez# | 1.712 | 2051 | |
| 29 | Pleun Davidse | 1.726 | 2027 | |
| 30 | Will O'Halloran | 1.729 | 2053 | |
| 30 | Lúcio Padilla | 1.729 | 2051 | |
| 32 | José Zavala | 1.733 | 2022 | |
| 32 | John Castle | 1.733 | 2029 | |
| 34 | Jesús Garces | 1.734 | 2027 | |
| 35 | Wilson Phillips# | 1.739 | 2062 | |
| 36 | Riley Breckenridge | 1.757 | 2023 | |
| 37 | Gilberto Espinoza# | 1.763 | 2056 | |
| 38 | Billy Warren# | 1.768 | 2061 | |
| 39 | Edmund Blackadder | 1.772 | 2030 | |
| 40 | León Berroa# | 1.773 | 2056 | |
| 40 | Julian Glenn | 1.773 | 2052 | |
| 42 | Tomás Rodríguez | 1.782 | 2046 | |
| 42 | Ernie Gibson# | 1.782 | 2053 | |
| 44 | Brian Fixel | 1.787 | 2025 | |
| 45 | Carlos González | 1.794 | 2028 | |
| 46 | Keith Whalen | 1.800 | 2052 | |
| 47 | Bobby Graham# | 1.806 | 2059 | |
| 47 | James Brandon | 1.806 | 2041 | |
| 49 | Matt Digby | 1.813 | 2028 | |
| 50 | Luis Rosário | 1.817 | 2045 | |
| 51 | Manny Pérez | 1.820 | 2021 | |
| 51 | Yaichiro Shini | 1.820 | 2045 | |
| 53 | Bill Holman# | 1.821 | 2061 | |
| 54 | Pedro Rodríguez | 1.824 | 2022 | |
| 55 | Jeffrey Eckert | 1.832 | 2045 | |
| 55 | Ángel Silva | 1.832 | 2033 | |
| 57 | Gilberto Medina | 1.843 | 2027 | |
| 58 | Ira Hipps | 1.845 | 2027 | |
| 59 | Jesús Guerra | 1.846 | 2025 | |
| 59 | Bill Tennant | 1.846 | 2036 | |
| 61 | Luis Bongers | 1.849 | 2043 | |
| 62 | Martín Aguilar | 1.853 | 2027 | |
| 62 | Bernardo Cruz# | 1.853 | 2053 | |
| 64 | Nicolas Roche | 1.856 | 2030 | |
| 65 | Milton Houston | 1.862 | 2047 | |
| 66 | Brady Thomas# | 1.870 | 2059 | |
| 67 | Fred Wilson | 1.874 | 2023 | |
| 68 | David Fisher | 1.881 | 2051 | |
| 69 | Walliyullah Brown# | 1.884 | 2058 | |
| 70 | Pleun Davidse | 1.885 | 2028 | |
| 71 | Carlos Ibarra | 1.888 | 2025 | |
| 72 | Jordan Turpin | 1.890 | 2027 | |
| 73 | Reynaldo Sánchez | 1.901 | 2023 | |
| 74 | Sib Gijbels# | 1.905 | 2056 | |
| 75 | Pedro López | 1.909 | 2032 | |
| 76 | Kenny Beck | 1.910 | 2034 | |
| 77 | Shu-yen Thien | 1.917 | 2050 | |
| 78 | Santiago López | 1.918 | 2025 | |
| 79 | Dax Marshall | 1.923 | 2056 | |
| 80 | Ricardo García | 1.934 | 2029 | |
| 81 | Orlando Uribe | 1.935 | 2026 | |
| 82 | Roberto Cantú | 1.940 | 2021 | |
| 83 | Billy Grange | 1.948 | 2026 | |
| 84 | Jason Troughton | 1.951 | 2022 | |
| 85 | Luis Castrejón | 1.960 | 2023 | |
| 86 | Ron Woods# | 1.961 | 2059 | |
| 87 | Trevor Covenay | 1.965 | 2052 | |
| 88 | Bryan Boyd | 1.972 | 2022 | |
| 89 | Inunnguaq Lovstrom | 1.977 | 2046 | |
| 90 | Carlos Barajas | 1.979 | 2024 | |
| 91 | Carlos Costello | 1.983 | 2024 | |
| 92 | Michael White | 1.987 | 2036 | |
| 93 | Vadim Rajnev | 2.005 | 2037 | |
| 94 | David Fuentes | 2.007 | 2038 | |
| 95 | Poto Scacceri | 2.025 | 2025 | |
| 96 | Bill Tennant | 2.027 | 2035 | |
| 97 | Jong-beom Park | 2.029 | 2043 | |
| 98 | Manny Castro | 2.032 | 2028 | |
| 99 | Sam Mooney | 2.042 | 2024 | |
| 100 | Roberto Cabrera | 2.043 | 2020 |
