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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Gregory Bahena | 1.132 | 2027 | |
| 2 | Nate Jackson | 1.155 | 2032 | |
| 3 | Michael Machen* | 1.200 | 2028 | |
| 4 | Osvaldo Garibe | 1.250 | 2027 | |
| 5 | César Rosado | 1.363 | 2023 | |
| 6 | Jorge Mejía | 1.385 | 2027 | |
| 7 | Will Moore | 1.425 | 2024 | |
| 8 | Paco Manuel | 1.432 | 2025 | |
| 9 | Archibald Bridgestone | 1.494 | 2023 | |
| 10 | George Kane | 1.505 | 2034 | |
| 11 | John Hottinger | 1.511 | 2028 | |
| 12 | Dale Hamilton | 1.584 | 2027 | |
| 13 | Job Poppe | 1.599 | 2022 | |
| 14 | Alejandro Araya | 1.619 | 2027 | |
| 15 | David Buchanan | 1.634 | 2028 | |
| 16 | Jeff Arocha | 1.662 | 2030 | |
| 17 | Daisuke Maeda# | 1.678 | 2046 | |
| 18 | José Rico | 1.688 | 2023 | |
| 19 | Said Akimi | 1.704 | 2037 | |
| 20 | Pleun Davidse | 1.726 | 2027 | |
| 21 | José Zavala | 1.733 | 2022 | |
| 21 | John Castle | 1.733 | 2029 | |
| 23 | Jesús Garces | 1.734 | 2027 | |
| 24 | Riley Breckenridge | 1.757 | 2023 | |
| 25 | Edmund Blackadder | 1.772 | 2030 | |
| 26 | Tomás Rodríguez# | 1.782 | 2046 | |
| 27 | Brian Fixel | 1.787 | 2025 | |
| 28 | Carlos González | 1.794 | 2028 | |
| 29 | James Brandon# | 1.806 | 2041 | |
| 30 | Matt Digby | 1.813 | 2028 | |
| 31 | Luis Rosário# | 1.817 | 2045 | |
| 32 | Yaichiro Shini# | 1.820 | 2045 | |
| 32 | Manny Pérez | 1.820 | 2021 | |
| 34 | Pedro Rodríguez | 1.824 | 2022 | |
| 35 | Jeffrey Eckert | 1.832 | 2045 | |
| 35 | Ángel Silva | 1.832 | 2033 | |
| 37 | Gilberto Medina | 1.843 | 2027 | |
| 38 | Ira Hipps | 1.845 | 2027 | |
| 39 | Bill Tennant | 1.846 | 2036 | |
| 39 | Jesús Guerra | 1.846 | 2025 | |
| 41 | Luis Bongers | 1.849 | 2043 | |
| 42 | Martín Aguilar | 1.853 | 2027 | |
| 43 | Nicolas Roche | 1.856 | 2030 | |
| 44 | Milton Houston | 1.862 | 2047 | |
| 45 | Fred Wilson | 1.874 | 2023 | |
| 46 | Pleun Davidse | 1.885 | 2028 | |
| 47 | Carlos Ibarra | 1.888 | 2025 | |
| 48 | Jordan Turpin | 1.890 | 2027 | |
| 49 | Reynaldo Sánchez | 1.901 | 2023 | |
| 50 | Pedro López | 1.909 | 2032 | |
| 51 | Kenny Beck | 1.910 | 2034 | |
| 52 | Shu-yen Thien# | 1.917 | 2050 | |
| 53 | Santiago López | 1.918 | 2025 | |
| 54 | Ricardo García | 1.934 | 2029 | |
| 55 | Orlando Uribe | 1.935 | 2026 | |
| 56 | Roberto Cantú | 1.940 | 2021 | |
| 57 | Billy Grange | 1.948 | 2026 | |
| 58 | Jason Troughton | 1.951 | 2022 | |
| 59 | Luis Castrejón | 1.960 | 2023 | |
| 60 | Bryan Boyd | 1.972 | 2022 | |
| 61 | Inunnguaq Lovstrom# | 1.977 | 2046 | |
| 62 | Carlos Barajas | 1.979 | 2024 | |
| 63 | Carlos Costello | 1.983 | 2024 | |
| 64 | Michael White | 1.987 | 2036 | |
| 65 | Vadim Rajnev | 2.005 | 2037 | |
| 66 | David Fuentes | 2.007 | 2038 | |
| 67 | Poto Scacceri | 2.025 | 2025 | |
| 68 | Bill Tennant | 2.027 | 2035 | |
| 69 | Jong-beom Park# | 2.029 | 2043 | |
| 70 | Manny Castro | 2.032 | 2028 | |
| 71 | Sam Mooney | 2.042 | 2024 | |
| 72 | Roberto Cabrera | 2.043 | 2020 | |
| 73 | Alejandro García | 2.046 | 2026 | |
| 74 | Phil Miller | 2.052 | 2023 | |
| 75 | Nelson Cuevas | 2.053 | 2027 | |
| 76 | Roberto Cantú | 2.058 | 2020 | |
| 77 | Delmar Llerena | 2.059 | 2025 | |
| 77 | Dave O'Neil# | 2.059 | 2038 | |
| 79 | William Robinson# | 2.064 | 2046 | |
| 80 | Luis Hernández | 2.077 | 2023 | |
| 81 | Min-gook Chong | 2.084 | 2026 | |
| 82 | Ryan Riley# | 2.096 | 2043 | |
| 83 | Tobías Pérez | 2.098 | 2021 | |
| 84 | George Crane# | 2.102 | 2043 | |
| 85 | Ángel Rosas | 2.113 | 2028 | |
| 86 | Héctor Aguilar | 2.114 | 2028 | |
| 86 | Mark Greenwood | 2.114 | 2038 | |
| 88 | Juan Reyes | 2.115 | 2020 | |
| 89 | Bruno Mumford | 2.116 | 2035 | |
| 90 | Gabriel Herrera | 2.125 | 2025 | |
| 91 | Tim Sharp | 2.130 | 2032 | |
| 92 | Ken Clarke | 2.132 | 2024 | |
| 93 | Juan Reyes | 2.138 | 2021 | |
| 94 | Blaine Stottlar | 2.139 | 2027 | |
| 94 | Cisco Ortíz | 2.139 | 2024 | |
| 96 | Gerald Simmons# | 2.149 | 2046 | |
| 97 | Edmund Rochefort# | 2.150 | 2047 | |
| 98 | Luqman Barcoo | 2.163 | 2031 | |
| 99 | Carlos Padrón | 2.167 | 2026 | |
| 100 | Michael Brown | 2.170 | 2021 |
