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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 | Pin-zhen Au# | 0.844 | 2033 | |
| 5 | Domingo Peña | 1.080 | 2015 | |
| 6 | Dennis Inman | 1.125 | 2020 | |
| 6 | Peter Miner# | 1.125 | 2028 | |
| 8 | Allen Cox# | 1.205 | 2032 | |
| 9 | Adhipa Vemireddy# | 1.209 | 2032 | |
| 10 | Juan Mendoza# | 1.227 | 2031 | |
| 11 | Bob Ruíz# | 1.256 | 2031 | |
| 12 | Allen Cox# | 1.306 | 2033 | |
| 13 | Rob Young | 1.440 | 2028 | |
| 14 | Kinnosuke Sato | 1.446 | 2020 | |
| 15 | Mike Miller | 1.459 | 2013 | |
| 16 | Masafumi Tamura# | 1.500 | 2026 | |
| 17 | Ross Allan# | 1.514 | 2027 | |
| 18 | Austin Brown | 1.588 | 2013 | |
| 18 | Tanner Johnson# | 1.588 | 2031 | |
| 18 | Anthony Atkinson | 1.588 | 2020 | |
| 21 | Tanner Johnson# | 1.602 | 2032 | |
| 22 | Gabin Martin | 1.612 | 2031 | |
| 23 | Ze-dong Zhang# | 1.653 | 2026 | |
| 24 | Cohen Brouillette* | 1.667 | 2025 | |
| 24 | Rowan Derwent | 1.667 | 2014 | |
| 26 | Reynaldo Martínez | 1.673 | 2017 | |
| 27 | Tony López# | 1.688 | 2033 | |
| 27 | Luis Vega# | 1.688 | 2023 | |
| 27 | Brian Berry | 1.688 | 2023 | |
| 30 | Felipe Rodríguez# | 1.723 | 2030 | |
| 31 | Tanner Johnson# | 1.728 | 2029 | |
| 32 | Maurice Gould | 1.761 | 2014 | |
| 33 | Raúl Pérez | 1.800 | 2018 | |
| 33 | Rodney Armstrong | 1.800 | 2018 | |
| 33 | Ray Weeks | 1.800 | 2027 | |
| 36 | Peter Miner# | 1.855 | 2029 | |
| 37 | Fred Butler | 1.875 | 2029 | |
| 38 | Terence McKinley | 1.906 | 2015 | |
| 39 | Phoenix Smith# | 1.929 | 2024 | |
| 40 | Tanner Johnson# | 1.941 | 2027 | |
| 41 | José Gallegos | 1.952 | 2024 | |
| 42 | Allen Cox# | 1.957 | 2029 | |
| 43 | John Bryan | 1.964 | 2017 | |
| 44 | Raúl Pérez | 1.971 | 2013 | |
| 45 | Adhipa Vemireddy# | 1.985 | 2033 | |
| 46 | Oniji Nakashima | 2.032 | 2025 | |
| 47 | Royce Butterfield | 2.077 | 2016 | |
| 47 | José Gallegos | 2.077 | 2025 | |
| 49 | Morgan Tyson# | 2.100 | 2032 | |
| 50 | Michael Burton | 2.118 | 2025 | |
| 51 | António Medrano# | 2.132 | 2027 | |
| 52 | Ed Lott | 2.148 | 2023 | |
| 53 | Maurice Gould | 2.152 | 2020 | |
| 54 | Joe Good# | 2.160 | 2032 | |
| 55 | Prabodh Nimbalkar# | 2.177 | 2030 | |
| 56 | Tanner Johnson# | 2.189 | 2026 | |
| 57 | Paul Barrett# | 2.209 | 2024 | |
| 58 | Ángel Ruíz# | 2.250 | 2030 | |
| 58 | Clarence Byrd# | 2.250 | 2031 | |
| 58 | Tony López# | 2.250 | 2032 | |
| 58 | Paul Johnston | 2.250 | 2019 | |
| 58 | Ross Allan# | 2.250 | 2030 | |
| 58 | António Medrano# | 2.250 | 2028 | |
| 58 | Aaron Harris | 2.250 | 2018 | |
| 58 | Paul Johnston# | 2.250 | 2029 | |
| 58 | Ed Lott | 2.250 | 2022 | |
| 58 | John Bryan | 2.250 | 2023 | |
| 68 | Oniji Nakashima | 2.277 | 2024 | |
| 69 | José Gallegos | 2.298 | 2020 | |
| 70 | Ross Allan# | 2.314 | 2033 | |
| 70 | Adhipa Vemireddy# | 2.314 | 2031 | |
| 72 | Koi-sho An# | 2.328 | 2031 | |
| 73 | Joe Hardy# | 2.331 | 2029 | |
| 74 | Carlos Ruíz | 2.333 | 2019 | |
| 75 | Cohen Brouillette* | 2.348 | 2018 | |
| 76 | Rodney Armstrong | 2.376 | 2021 | |
| 77 | Alejandro Zorros# | 2.400 | 2032 | |
| 77 | Robert Long | 2.400 | 2016 | |
| 79 | Tomás Bravo# | 2.455 | 2030 | |
| 80 | Paul Barrett# | 2.492 | 2022 | |
| 81 | Prabodh Nimbalkar# | 2.531 | 2028 | |
| 82 | Khurshid Durrani# | 2.547 | 2030 | |
| 82 | John Bryan | 2.547 | 2019 | |
| 84 | Hidetada Abe# | 2.554 | 2032 | |
| 85 | José Gallegos | 2.571 | 2023 | |
| 86 | Júlio García | 2.613 | 2024 | |
| 87 | Fred Butler | 2.647 | 2030 | |
| 88 | Ross Allan# | 2.650 | 2031 | |
| 89 | Mitsuo Kobayashi# | 2.656 | 2032 | |
| 90 | Fred Price# | 2.670 | 2031 | |
| 91 | Jo-hsi Sang# | 2.700 | 2030 | |
| 91 | Bob Ruíz# | 2.700 | 2029 | |
| 91 | Tomás Bravo# | 2.700 | 2025 | |
| 94 | Cohen Brouillette* | 2.739 | 2024 | |
| 94 | John Martin | 2.739 | 2018 | |
| 96 | Pablo Cuevas | 2.746 | 2022 | |
| 97 | Kinnosuke Sato | 2.750 | 2018 | |
| 98 | Anupradana Agarkar# | 2.813 | 2031 | |
| 99 | Adam Thomas | 2.821 | 2015 | |
| 100 | Landy Lu# | 2.842 | 2024 |
