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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Robert Cates | 0.000 | 2017 | |
| 2 | Khurshid Durrani# | 0.422 | 2024 | |
| 3 | Giobbe Tadiotto# | 0.435 | 2027 | |
| 4 | Domingo Peña | 1.080 | 2015 | |
| 5 | Peter Miner# | 1.125 | 2028 | |
| 5 | Dennis Inman | 1.125 | 2020 | |
| 7 | Allen Cox# | 1.205 | 2032 | |
| 8 | Adhipa Vemireddy# | 1.209 | 2032 | |
| 9 | Juan Mendoza# | 1.227 | 2031 | |
| 10 | Bob Ruíz# | 1.256 | 2031 | |
| 11 | Rob Young | 1.440 | 2028 | |
| 12 | Kinnosuke Sato | 1.446 | 2020 | |
| 13 | Mike Miller | 1.459 | 2013 | |
| 14 | Masafumi Tamura# | 1.500 | 2026 | |
| 15 | Ross Allan# | 1.514 | 2027 | |
| 16 | Tanner Johnson# | 1.588 | 2031 | |
| 16 | Austin Brown | 1.588 | 2013 | |
| 16 | Anthony Atkinson | 1.588 | 2020 | |
| 19 | Tanner Johnson# | 1.602 | 2032 | |
| 20 | Gabin Martin# | 1.612 | 2031 | |
| 21 | Ze-dong Zhang# | 1.653 | 2026 | |
| 22 | Cohen Brouillette | 1.667 | 2025 | |
| 22 | Rowan Derwent | 1.667 | 2014 | |
| 24 | Reynaldo Martínez | 1.673 | 2017 | |
| 25 | Luis Vega# | 1.688 | 2023 | |
| 25 | Brian Berry | 1.688 | 2023 | |
| 27 | Felipe Rodríguez# | 1.723 | 2030 | |
| 28 | Tanner Johnson# | 1.728 | 2029 | |
| 29 | Maurice Gould | 1.761 | 2014 | |
| 30 | Ray Weeks | 1.800 | 2027 | |
| 30 | Raúl Pérez | 1.800 | 2018 | |
| 30 | Rodney Armstrong | 1.800 | 2018 | |
| 33 | Peter Miner# | 1.855 | 2029 | |
| 34 | Fred Butler | 1.875 | 2029 | |
| 35 | Terence McKinley | 1.906 | 2015 | |
| 36 | Phoenix Smith# | 1.929 | 2024 | |
| 37 | Tanner Johnson# | 1.941 | 2027 | |
| 38 | José Gallegos# | 1.952 | 2024 | |
| 39 | Allen Cox# | 1.957 | 2029 | |
| 40 | John Bryan | 1.964 | 2017 | |
| 41 | Raúl Pérez | 1.971 | 2013 | |
| 42 | Oniji Nakashima | 2.032 | 2025 | |
| 43 | José Gallegos# | 2.077 | 2025 | |
| 43 | Royce Butterfield | 2.077 | 2016 | |
| 45 | Morgan Tyson# | 2.100 | 2032 | |
| 46 | Michael Burton | 2.118 | 2025 | |
| 47 | António Medrano# | 2.132 | 2027 | |
| 48 | Ed Lott | 2.148 | 2023 | |
| 49 | Maurice Gould | 2.152 | 2020 | |
| 50 | Joe Good# | 2.160 | 2032 | |
| 51 | Prabodh Nimbalkar# | 2.177 | 2030 | |
| 52 | Tanner Johnson# | 2.189 | 2026 | |
| 53 | Paul Barrett# | 2.209 | 2024 | |
| 54 | Ross Allan# | 2.250 | 2030 | |
| 54 | Ed Lott | 2.250 | 2022 | |
| 54 | Clarence Byrd# | 2.250 | 2031 | |
| 54 | António Medrano# | 2.250 | 2028 | |
| 54 | John Bryan | 2.250 | 2023 | |
| 54 | Paul Johnston | 2.250 | 2019 | |
| 54 | Ángel Ruíz# | 2.250 | 2030 | |
| 54 | Aaron Harris | 2.250 | 2018 | |
| 54 | Paul Johnston# | 2.250 | 2029 | |
| 54 | Tony López# | 2.250 | 2032 | |
| 64 | Oniji Nakashima | 2.277 | 2024 | |
| 65 | José Gallegos# | 2.298 | 2020 | |
| 66 | Adhipa Vemireddy# | 2.314 | 2031 | |
| 67 | Koi-sho An# | 2.328 | 2031 | |
| 68 | Joe Hardy# | 2.331 | 2029 | |
| 69 | Carlos Ruíz | 2.333 | 2019 | |
| 70 | Cohen Brouillette | 2.348 | 2018 | |
| 71 | Rodney Armstrong | 2.376 | 2021 | |
| 72 | Alejandro Zorros# | 2.400 | 2032 | |
| 72 | Robert Long | 2.400 | 2016 | |
| 74 | Tomás Bravo# | 2.455 | 2030 | |
| 75 | Paul Barrett# | 2.492 | 2022 | |
| 76 | Prabodh Nimbalkar# | 2.531 | 2028 | |
| 77 | John Bryan | 2.547 | 2019 | |
| 77 | Khurshid Durrani# | 2.547 | 2030 | |
| 79 | Hidetada Abe# | 2.554 | 2032 | |
| 80 | José Gallegos# | 2.571 | 2023 | |
| 81 | Júlio García | 2.613 | 2024 | |
| 82 | Fred Butler | 2.647 | 2030 | |
| 83 | Ross Allan# | 2.650 | 2031 | |
| 84 | Mitsuo Kobayashi# | 2.656 | 2032 | |
| 85 | Fred Price# | 2.670 | 2031 | |
| 86 | Jo-hsi Sang# | 2.700 | 2030 | |
| 86 | Bob Ruíz# | 2.700 | 2029 | |
| 86 | Tomás Bravo# | 2.700 | 2025 | |
| 89 | John Martin | 2.739 | 2018 | |
| 89 | Cohen Brouillette | 2.739 | 2024 | |
| 91 | Pablo Cuevas | 2.746 | 2022 | |
| 92 | Kinnosuke Sato | 2.750 | 2018 | |
| 93 | Anupradana Agarkar# | 2.813 | 2031 | |
| 94 | Adam Thomas | 2.821 | 2015 | |
| 95 | Landy Lu# | 2.842 | 2024 | |
| 96 | Paul Johnston# | 2.859 | 2032 | |
| 97 | Roberto Martínez | 2.864 | 2019 | |
| 98 | Dylan Butlin# | 2.872 | 2026 | |
| 98 | Kent Rose | 2.872 | 2014 | |
| 100 | Iván Morales# | 2.880 | 2028 |
