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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Javier Mora# | 1.401 | 2023 | |
| 2 | Bobby Swain# | 1.651 | 2022 | |
| 3 | Pedro Valdéz# | 1.735 | 2023 | |
| 4 | Juan Guillén# | 2.020 | 2030 | |
| 5 | Walt Coffman# | 2.045 | 2031 | |
| 6 | Torvald Geertsen | 2.058 | 2019 | |
| 7 | Jorge Otero# | 2.077 | 2030 | |
| 8 | Ryan Davis | 2.085 | 2019 | |
| 9 | Bobby Swain# | 2.095 | 2023 | |
| 10 | Jason Hubbell | 2.118 | 2022 | |
| 11 | Javier Mora# | 2.137 | 2026 | |
| 12 | Bartolomeu Lio# | 2.154 | 2021 | |
| 13 | Nathaniel Riley | 2.198 | 2021 | |
| 14 | Pedro Valdéz# | 2.202 | 2027 | |
| 15 | Lou Hartling | 2.216 | 2022 | |
| 16 | Jesús Gonzáles# | 2.224 | 2020 | |
| 17 | Pedro Alejándrez# | 2.235 | 2022 | |
| 18 | Pedro Alejándrez# | 2.250 | 2023 | |
| 19 | Germán Rodríguez# | 2.259 | 2028 | |
| 20 | Francis McBride# | 2.280 | 2025 | |
| 21 | Eddie Kop# | 2.281 | 2025 | |
| 22 | Eijiro Takahashi# | 2.283 | 2030 | |
| 23 | Roberto Ortega | 2.343 | 2018 | |
| 24 | Wes Hamm# | 2.348 | 2024 | |
| 25 | Juan Guillén# | 2.355 | 2029 | |
| 26 | George Frazier# | 2.358 | 2022 | |
| 27 | Natalino Golaio# | 2.370 | 2027 | |
| 28 | Cory Sanders# | 2.375 | 2026 | |
| 29 | Todd Hines# | 2.379 | 2025 | |
| 29 | Juan Guillén# | 2.379 | 2028 | |
| 31 | Stuart Lee | 2.386 | 2021 | |
| 32 | Ángel Navarro# | 2.389 | 2027 | |
| 33 | Greg White | 2.394 | 2025 | |
| 34 | John Wilkins | 2.398 | 2016 | |
| 35 | Eddie Kop# | 2.401 | 2026 | |
| 36 | Keisuke Nishida# | 2.444 | 2028 | |
| 37 | Gerardo Pagán# | 2.448 | 2027 | |
| 38 | Lou Hartling | 2.459 | 2023 | |
| 39 | Nicholas Wells# | 2.460 | 2021 | |
| 40 | Wayne Craig# | 2.461 | 2019 | |
| 41 | John Woods# | 2.470 | 2026 | |
| 42 | Addie Samson# | 2.517 | 2028 | |
| 43 | John Dempsey# | 2.521 | 2022 | |
| 44 | Dave Goode | 2.524 | 2022 | |
| 45 | Wayne Craig# | 2.533 | 2023 | |
| 46 | Pedro Valdéz# | 2.540 | 2024 | |
| 47 | John Wilkins | 2.543 | 2025 | |
| 48 | Aurelio López# | 2.546 | 2026 | |
| 49 | Javier Roldán# | 2.554 | 2025 | |
| 50 | Raúl Gómez# | 2.584 | 2027 | |
| 51 | Wes Hamm# | 2.591 | 2023 | |
| 52 | Pablo De La Torre# | 2.607 | 2025 | |
| 53 | Javier Mora# | 2.609 | 2022 | |
| 54 | Juan Torres# | 2.610 | 2031 | |
| 55 | Joe Ellis | 2.615 | 2016 | |
| 56 | Jung-hoon Kim | 2.620 | 2019 | |
| 57 | David Collingwood# | 2.625 | 2021 | |
| 58 | Vincent Hall# | 2.634 | 2021 | |
| 59 | Eddie Kop# | 2.643 | 2028 | |
| 60 | Natalino Golaio# | 2.645 | 2026 | |
| 61 | Pete Wood | 2.662 | 2016 | |
| 62 | David Hudson# | 2.669 | 2022 | |
| 63 | Wayne Craig# | 2.679 | 2017 | |
| 64 | Allen Blair# | 2.681 | 2020 | |
| 65 | Wes Hamm# | 2.694 | 2026 | |
| 66 | Yoriyoshi Yamamoto | 2.719 | 2024 | |
| 67 | Roderick Rhodes | 2.723 | 2020 | |
| 68 | Jesús Franco# | 2.738 | 2028 | |
| 69 | Timothy Allen | 2.745 | 2016 | |
| 70 | Paul Díaz | 2.754 | 2020 | |
| 71 | Chester Henry | 2.759 | 2017 | |
| 72 | Britt Yates | 2.765 | 2021 | |
| 73 | Billy Crawford | 2.772 | 2021 | |
| 73 | Keisuke Nishida# | 2.772 | 2031 | |
| 75 | Félix Jiménez | 2.779 | 2019 | |
| 76 | Henry Hall | 2.809 | 2022 | |
| 77 | Marvin Martin# | 2.811 | 2031 | |
| 78 | Giovanni Mireles# | 2.816 | 2030 | |
| 79 | Scott Woodger# | 2.826 | 2028 | |
| 80 | Arnie Pittman# | 2.827 | 2026 | |
| 81 | Héctor Alarcon# | 2.828 | 2021 | |
| 82 | Alfonso Zapata# | 2.831 | 2026 | |
| 83 | Víctor García# | 2.839 | 2026 | |
| 84 | Allen Blair# | 2.852 | 2021 | |
| 85 | Wayne Hurst | 2.862 | 2025 | |
| 86 | Kyle Lewis | 2.864 | 2024 | |
| 87 | Júlio Palma# | 2.871 | 2024 | |
| 88 | Ron Stone# | 2.872 | 2027 | |
| 89 | Kyle Boddy# | 2.874 | 2026 | |
| 90 | Pedro Valdéz# | 2.877 | 2029 | |
| 91 | Hermenegildo Beliago# | 2.885 | 2029 | |
| 92 | Devin Hinton | 2.905 | 2017 | |
| 93 | Curtis Fields | 2.908 | 2022 | |
| 94 | Gary Bailey# | 2.911 | 2022 | |
| 94 | Juan Guillén# | 2.911 | 2027 | |
| 96 | George Frazier# | 2.921 | 2021 | |
| 97 | Alf Näsbom | 2.927 | 2016 | |
| 98 | Ralph McKinney# | 2.928 | 2019 | |
| 99 | Fraser Cuevas# | 2.930 | 2022 | |
| 100 | Santiago Alonza# | 2.931 | 2027 |
