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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Gary Cox | 1.904 | 2014 | |
| 2 | Mike Saunders | 2.032 | 2014 | |
| 3 | Fernando Guzmán# | 2.268 | 2029 | |
| 4 | Jim Frazier | 2.355 | 2012 | |
| 5 | Andy Gustafson | 2.363 | 2008 | |
| 6 | Manuel Fuentes | 2.406 | 2024 | |
| 7 | Reagan Wear* | 2.472 | 2014 | |
| 8 | Enrique Valdés | 2.506 | 2024 | |
| 9 | Stanley Briggs | 2.625 | 2023 | |
| 10 | José Salinas | 2.634 | 2026 | |
| 11 | Steve Godsey | 2.732 | 2013 | |
| 12 | Gerald Russell | 2.760 | 2013 | |
| 13 | Ron Biller | 2.771 | 2024 | |
| 14 | Manuel González | 2.793 | 2019 | |
| 15 | Fred Martin | 2.812 | 2010 | |
| 16 | Francisco Ríos | 2.814 | 2026 | |
| 17 | José Salinas | 2.838 | 2028 | |
| 18 | Francisco Nieto | 2.864 | 2026 | |
| 19 | Jason Hayes | 2.870 | 2010 | |
| 20 | Cliff Long# | 2.920 | 2027 | |
| 21 | Anthony Jackson | 2.954 | 2025 | |
| 22 | Manuel Santiago | 2.976 | 2029 | |
| 23 | Ben Lane | 2.977 | 2011 | |
| 24 | Dae-ik Kim | 3.010 | 2008 | |
| 25 | Ze-dong Quian | 3.029 | 2011 | |
| 26 | George Lockhart | 3.032 | 2024 | |
| 27 | Lou Peterson | 3.038 | 2016 | |
| 28 | Ramiro Jiménez | 3.045 | 2015 | |
| 29 | Artie Skinner | 3.046 | 2011 | |
| 30 | Daron Chandler# | 3.092 | 2036 | |
| 30 | Rafael Santillanenz | 3.092 | 2011 | |
| 32 | Luis Fernández | 3.098 | 2023 | |
| 33 | Jim DeWitt | 3.105 | 2012 | |
| 34 | John Knight | 3.134 | 2031 | |
| 35 | Andy Gustafson | 3.145 | 2016 | |
| 36 | Bennett Price | 3.148 | 2014 | |
| 37 | Juan Reyes | 3.158 | 2012 | |
| 38 | António Ruíz# | 3.171 | 2030 | |
| 39 | Jim Fitzgerald | 3.194 | 2028 | |
| 40 | Ron Scott | 3.195 | 2026 | |
| 41 | Héctor Gonzáles | 3.204 | 2009 | |
| 42 | Jeffrey Stephens | 3.222 | 2026 | |
| 43 | Ted Horn | 3.228 | 2008 | |
| 44 | Mark MacGruder | 3.234 | 2023 | |
| 45 | Tim Chambers | 3.236 | 2010 | |
| 46 | Anthony Erickson | 3.258 | 2024 | |
| 47 | Ralph Williams# | 3.285 | 2033 | |
| 48 | Sugimoto Kuhabara | 3.303 | 2009 | |
| 49 | Kunihiko Daikawa | 3.304 | 2024 | |
| 50 | Jesús Medina | 3.307 | 2007 | |
| 51 | Sergio Longoria | 3.322 | 2008 | |
| 52 | Stanley Inman | 3.334 | 2020 | |
| 53 | Ricardo Guzmán | 3.351 | 2012 | |
| 54 | José Acevedo | 3.375 | 2026 | |
| 55 | Javier Encarnación | 3.381 | 2018 | |
| 56 | Octávio Ramírez | 3.386 | 2022 | |
| 57 | Ralph Willaims | 3.392 | 2025 | |
| 58 | Kiyomitsu Fujii | 3.405 | 2018 | |
| 59 | Ramón Estrada | 3.408 | 2016 | |
| 60 | Harvey Bradridge | 3.431 | 2018 | |
| 61 | Ron Andersen | 3.444 | 2012 | |
| 62 | Max Miller | 3.473 | 2008 | |
| 63 | Wilson Pérez | 3.490 | 2012 | |
| 64 | Ralph Williams# | 3.498 | 2032 | |
| 65 | Kent Robinson | 3.511 | 2023 | |
| 66 | Francisco Morales# | 3.536 | 2022 | |
| 67 | Tomás Fajardo | 3.546 | 2017 | |
| 68 | Silas Hampton# | 3.549 | 2034 | |
| 69 | Isaac Coleman | 3.555 | 2025 | |
| 70 | Isaac Coleman | 3.564 | 2027 | |
| 71 | Manuel González | 3.567 | 2016 | |
| 72 | Román Castillo | 3.569 | 2015 | |
| 73 | Kunihiko Daikawa | 3.580 | 2023 | |
| 74 | Hugh Fields# | 3.581 | 2032 | |
| 75 | Francisco Nieto | 3.585 | 2025 | |
| 76 | Mitch Brown | 3.591 | 2022 | |
| 77 | Víctor Hernández | 3.593 | 2029 | |
| 78 | Clint Tancock | 3.606 | 2019 | |
| 79 | Ramón Cruz | 3.607 | 2008 | |
| 80 | António Ruíz# | 3.609 | 2029 | |
| 81 | Octávio Ramírez | 3.640 | 2023 | |
| 82 | Jim Durham | 3.644 | 2027 | |
| 83 | José Ramos | 3.652 | 2015 | |
| 84 | Ross Holley | 3.660 | 2012 | |
| 85 | Jorge Rodríguez | 3.666 | 2007 | |
| 86 | Joe Moody | 3.667 | 2014 | |
| 87 | Manuel López | 3.675 | 2011 | |
| 88 | Ted Horn | 3.688 | 2012 | |
| 89 | Peter Flowers | 3.690 | 2014 | |
| 90 | Luis Mendoza | 3.693 | 2008 | |
| 91 | Derek Larkin | 3.707 | 2011 | |
| 91 | Ronald Baker# | 3.707 | 2033 | |
| 93 | Dawit Babla | 3.719 | 2008 | |
| 94 | George Floyd | 3.721 | 2029 | |
| 95 | Jesús Núñez# | 3.724 | 2031 | |
| 96 | Nick Harrison# | 3.735 | 2034 | |
| 97 | Bartolo Martínez | 3.736 | 2012 | |
| 98 | José Hernández | 3.756 | 2014 | |
| 99 | Paul Miller | 3.763 | 2025 | |
| 99 | Bennett Price | 3.763 | 2013 |
