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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Todd Hines | 1.389 | 2023 | |
| 2 | Shigemasa Horiuchi | 1.554 | 2020 | |
| 3 | Michael Machen# | 1.558 | 2033 | |
| 4 | Randy Hoffman | 1.562 | 2021 | |
| 5 | Todd Hines | 1.708 | 2024 | |
| 6 | Tom Reynolds | 1.751 | 2016 | |
| 7 | Ramón Ortega* | 1.787 | 2022 | |
| 8 | Pedro Ritodíaz | 1.808 | 2017 | |
| 9 | Harrison Jones | 1.836 | 2017 | |
| 9 | Kyle Lewis | 1.836 | 2015 | |
| 11 | William Johnson | 1.916 | 2016 | |
| 12 | Tim Powell | 1.932 | 2017 | |
| 13 | Keisuke Nishida# | 1.941 | 2027 | |
| 14 | Tom Reynolds | 1.957 | 2018 | |
| 15 | Sexto Rodríguez | 1.990 | 2016 | |
| 16 | Roberto Calderón# | 2.018 | 2029 | |
| 17 | Shigemasa Horiuchi | 2.022 | 2019 | |
| 18 | Walt Coffman# | 2.039 | 2028 | |
| 19 | David Buchanan# | 2.043 | 2032 | |
| 20 | José Reyna | 2.063 | 2022 | |
| 21 | Peter Rivers | 2.065 | 2020 | |
| 22 | Luis Peña# | 2.073 | 2026 | |
| 23 | Gary Bailey | 2.106 | 2029 | |
| 24 | Adrián Fierro | 2.108 | 2020 | |
| 25 | Lorenzo Sánchez# | 2.146 | 2020 | |
| 26 | Dave Goode | 2.150 | 2019 | |
| 27 | Pedro Ritodíaz | 2.155 | 2015 | |
| 28 | Pedro Ritodíaz | 2.168 | 2016 | |
| 29 | Shigemasa Horiuchi | 2.177 | 2028 | |
| 30 | Pedro Alejándrez# | 2.204 | 2020 | |
| 31 | Gary Bailey | 2.209 | 2018 | |
| 32 | Jason Hubbell | 2.222 | 2021 | |
| 33 | Shigemasa Horiuchi | 2.224 | 2018 | |
| 34 | Rafael Cardona# | 2.226 | 2025 | |
| 35 | Ricardo Hernández | 2.235 | 2016 | |
| 36 | Eddie Kop# | 2.255 | 2027 | |
| 37 | Chip Bishop | 2.279 | 2015 | |
| 38 | Peter Rivers | 2.289 | 2019 | |
| 39 | Ralph Jones | 2.291 | 2015 | |
| 39 | David Buchanan# | 2.291 | 2031 | |
| 41 | Shigemasa Horiuchi | 2.309 | 2021 | |
| 42 | George Frazier# | 2.326 | 2026 | |
| 43 | Michael Machen# | 2.329 | 2032 | |
| 44 | Carlos Sánchez# | 2.341 | 2023 | |
| 44 | Gary Bailey | 2.341 | 2020 | |
| 46 | Javier Castillo# | 2.344 | 2030 | |
| 47 | Matt Webber | 2.345 | 2022 | |
| 48 | Pat Farrell | 2.359 | 2015 | |
| 49 | Tim Powell | 2.368 | 2018 | |
| 50 | George Frazier# | 2.372 | 2032 | |
| 51 | Michael Machen# | 2.378 | 2031 | |
| 52 | Neil Franson# | 2.389 | 2031 | |
| 53 | Alexis Zambaco# | 2.390 | 2028 | |
| 54 | Florim Zhulati | 2.392 | 2015 | |
| 55 | Chip Bishop | 2.400 | 2025 | |
| 56 | John Holley | 2.401 | 2016 | |
| 57 | Won-u Yi# | 2.418 | 2034 | |
| 58 | Dave Goode | 2.424 | 2021 | |
| 59 | Maru Pao Pao# | 2.431 | 2032 | |
| 59 | Alexis Zambaco# | 2.431 | 2033 | |
| 61 | Addie Samson# | 2.443 | 2027 | |
| 62 | Gary Bailey | 2.455 | 2019 | |
| 62 | Pat Farrell | 2.455 | 2016 | |
| 62 | José Muñóz# | 2.455 | 2030 | |
| 65 | Rafael Cardona# | 2.460 | 2022 | |
| 66 | Zach Rediker# | 2.466 | 2029 | |
| 67 | Rusty Swanson# | 2.468 | 2028 | |
| 68 | Lorenzo Sánchez# | 2.480 | 2021 | |
| 69 | Jared Cox | 2.485 | 2016 | |
| 69 | Ryan Bentley# | 2.485 | 2032 | |
| 71 | José Alaniz | 2.488 | 2021 | |
| 72 | Henry Hall | 2.492 | 2023 | |
| 73 | Arnie Pittman | 2.493 | 2030 | |
| 74 | Alfonso Zapata# | 2.496 | 2025 | |
| 75 | Walt Coffman# | 2.504 | 2029 | |
| 76 | Miguel Angel Martínez# | 2.508 | 2034 | |
| 77 | Tim Powell | 2.516 | 2016 | |
| 78 | Pedro Alejándrez# | 2.519 | 2021 | |
| 79 | Will Hunting# | 2.535 | 2031 | |
| 80 | Tomás Vargas# | 2.549 | 2032 | |
| 80 | Addie Samson# | 2.549 | 2026 | |
| 82 | Michael Machen# | 2.550 | 2030 | |
| 83 | Ron Manning# | 2.552 | 2030 | |
| 84 | Kent Clement# | 2.555 | 2028 | |
| 85 | John Alvarado | 2.557 | 2020 | |
| 86 | Gary Bailey | 2.559 | 2021 | |
| 87 | Tyler MacHugh# | 2.565 | 2031 | |
| 88 | Benny York | 2.571 | 2017 | |
| 89 | Michael Machen# | 2.574 | 2029 | |
| 90 | Edison Larson# | 2.575 | 2028 | |
| 91 | Carlos Sánchez# | 2.579 | 2022 | |
| 92 | Manuel Rojas | 2.586 | 2016 | |
| 93 | Tetsuzan Kaneko | 2.587 | 2022 | |
| 94 | Kevin Nogilny# | 2.593 | 2032 | |
| 95 | Bill Prowse | 2.594 | 2016 | |
| 96 | Greg White | 2.597 | 2022 | |
| 97 | Eric Matson# | 2.604 | 2027 | |
| 98 | Tetsuzan Kaneko | 2.605 | 2023 | |
| 99 | Chip Bishop | 2.615 | 2016 | |
| 100 | Gary Bailey | 2.616 | 2028 |
