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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 | Carlos Sandoval# | 1.821 | 2054 | |
| 10 | Harrison Jones | 1.836 | 2017 | |
| 10 | Kyle Lewis | 1.836 | 2015 | |
| 12 | Kent Good | 1.839 | 2037 | |
| 13 | Kelly St. John | 1.860 | 2051 | |
| 14 | Jesús Ramírez# | 1.862 | 2053 | |
| 15 | William Johnson | 1.916 | 2016 | |
| 16 | Tim Powell | 1.932 | 2017 | |
| 17 | Cheol-han Cho# | 1.934 | 2053 | |
| 18 | Keisuke Nishida | 1.941 | 2027 | |
| 19 | Tom Reynolds* | 1.957 | 2018 | |
| 20 | Sexto Rodríguez | 1.990 | 2016 | |
| 21 | Nick Snyder# | 1.991 | 2050 | |
| 22 | Roberto Calderón | 2.018 | 2029 | |
| 23 | Shigemasa Horiuchi* | 2.022 | 2019 | |
| 24 | Walt Coffman* | 2.039 | 2028 | |
| 25 | Jesús Ramírez# | 2.043 | 2052 | |
| 25 | David Buchanan | 2.043 | 2032 | |
| 27 | José Martínez# | 2.057 | 2050 | |
| 28 | José Reyna | 2.063 | 2022 | |
| 29 | Peter Rivers | 2.065 | 2020 | |
| 30 | Luis Peña | 2.073 | 2026 | |
| 31 | Cheol-han Cho# | 2.077 | 2054 | |
| 32 | Gerardo Pagán | 2.105 | 2041 | |
| 33 | Gary Bailey* | 2.106 | 2029 | |
| 34 | Adrián Fierro | 2.108 | 2020 | |
| 35 | Nick Long# | 2.113 | 2053 | |
| 36 | Lorenzo Sánchez | 2.146 | 2020 | |
| 37 | Dave Goode | 2.150 | 2019 | |
| 38 | Pedro Ritodíaz | 2.155 | 2015 | |
| 39 | Pedro Ritodíaz | 2.168 | 2016 | |
| 40 | Shigemasa Horiuchi* | 2.177 | 2028 | |
| 41 | Jorge Otero* | 2.182 | 2039 | |
| 42 | Pedro Alejándrez* | 2.204 | 2020 | |
| 43 | Gary Bailey* | 2.209 | 2018 | |
| 44 | Brian Hill# | 2.217 | 2056 | |
| 45 | Jason Hubbell | 2.222 | 2021 | |
| 46 | Shigemasa Horiuchi* | 2.224 | 2018 | |
| 47 | Rafael Cardona | 2.226 | 2025 | |
| 48 | Miguel González# | 2.229 | 2054 | |
| 49 | William Turner | 2.231 | 2053 | |
| 50 | Conor Starks# | 2.233 | 2051 | |
| 51 | Ricardo Hernández | 2.235 | 2016 | |
| 52 | Eddie Kop* | 2.255 | 2027 | |
| 53 | An Jang-Yop* | 2.262 | 2043 | |
| 54 | Chip Bishop | 2.279 | 2015 | |
| 55 | Peter Rivers | 2.289 | 2019 | |
| 56 | Ralph Jones | 2.291 | 2015 | |
| 56 | David Buchanan | 2.291 | 2031 | |
| 58 | Shigemasa Horiuchi* | 2.309 | 2021 | |
| 59 | Conor Starks# | 2.311 | 2056 | |
| 60 | Earl Hurdle | 2.316 | 2045 | |
| 60 | Aarre Rissanen# | 2.316 | 2052 | |
| 62 | George Frazier | 2.326 | 2026 | |
| 63 | Michael Machen* | 2.329 | 2032 | |
| 64 | Carlos Sánchez | 2.341 | 2023 | |
| 64 | Gary Bailey* | 2.341 | 2020 | |
| 66 | Javier Castillo | 2.344 | 2030 | |
| 67 | Matt Webber | 2.345 | 2022 | |
| 68 | Conor Starks# | 2.348 | 2054 | |
| 69 | Pat Farrell | 2.359 | 2015 | |
| 70 | Juan Rayo# | 2.365 | 2052 | |
| 70 | Bhagavan Antle# | 2.365 | 2056 | |
| 72 | Tim Powell | 2.368 | 2018 | |
| 73 | George Frazier | 2.372 | 2032 | |
| 74 | Michael Machen* | 2.378 | 2031 | |
| 75 | Roman Phansalker | 2.386 | 2039 | |
| 76 | Neil Franson | 2.389 | 2031 | |
| 77 | Alexis Zambaco | 2.390 | 2028 | |
| 78 | Florim Zhulati | 2.392 | 2015 | |
| 79 | Chip Bishop | 2.400 | 2025 | |
| 80 | John Holley | 2.401 | 2016 | |
| 81 | Cisco Hernández# | 2.406 | 2053 | |
| 82 | Yaichiro Shini# | 2.417 | 2052 | |
| 83 | Won-u Yi | 2.418 | 2034 | |
| 84 | Dave Goode | 2.424 | 2021 | |
| 85 | Maru Pao Pao | 2.431 | 2032 | |
| 85 | Alexis Zambaco | 2.431 | 2033 | |
| 87 | Pablo Moreno# | 2.438 | 2055 | |
| 88 | Addie Samson | 2.443 | 2027 | |
| 89 | Ken Wright# | 2.448 | 2050 | |
| 90 | Pat Farrell | 2.455 | 2016 | |
| 90 | Gary Bailey* | 2.455 | 2019 | |
| 90 | José Muñóz | 2.455 | 2030 | |
| 93 | Rafael Cardona | 2.460 | 2022 | |
| 94 | Mitch Ivey | 2.461 | 2053 | |
| 95 | Zach Rediker | 2.466 | 2029 | |
| 96 | Rusty Swanson | 2.468 | 2028 | |
| 97 | Lorenzo Sánchez | 2.480 | 2021 | |
| 98 | Javier Cuesta# | 2.482 | 2055 | |
| 99 | Sean Jones | 2.484 | 2053 | |
| 100 | Jared Cox | 2.485 | 2016 |
