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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Chuk-yan Chio | 0.563 | 2028 | |
| 2 | Robert Avila# | 0.574 | 2028 | |
| 3 | Leland Bullins# | 0.900 | 2031 | |
| 4 | Yoritomo Ine | 1.038 | 2018 | |
| 5 | Van Perry# | 1.125 | 2029 | |
| 6 | Frank Hillier# | 1.286 | 2031 | |
| 7 | Jayakar Ramadin | 1.459 | 2022 | |
| 8 | David Bryan | 1.500 | 2021 | |
| 9 | Jason Atkinson | 1.558 | 2024 | |
| 10 | Kichibei Ozawa | 1.565 | 2025 | |
| 11 | Senzo Nakashima | 1.667 | 2023 | |
| 12 | Seong-rae An# | 2.051 | 2029 | |
| 13 | Teguh Suharto# | 2.077 | 2025 | |
| 13 | Randy Hamilton | 2.077 | 2015 | |
| 13 | Keith Rogers | 2.077 | 2024 | |
| 16 | Kirk Snyder | 2.213 | 2015 | |
| 17 | David White | 2.224 | 2015 | |
| 18 | José Castillo | 2.250 | 2024 | |
| 19 | Noriaki Kichida | 2.328 | 2017 | |
| 20 | Calvin Townend | 2.348 | 2014 | |
| 20 | Chris Baxter | 2.348 | 2018 | |
| 20 | Lincoln Brouillette | 2.348 | 2014 | |
| 23 | Ijaz Kharoti# | 2.455 | 2027 | |
| 24 | Dave Munier# | 2.500 | 2031 | |
| 25 | Luis Sandoval | 2.571 | 2014 | |
| 25 | Max Grant# | 2.571 | 2020 | |
| 27 | Paul Woodrow# | 2.662 | 2025 | |
| 28 | Pat McConnell# | 2.667 | 2028 | |
| 29 | John Martin | 2.700 | 2012 | |
| 30 | Phil Phillips# | 2.813 | 2026 | |
| 31 | Bernard Dupuis | 2.919 | 2017 | |
| 32 | Kulapati Pandian# | 2.945 | 2021 | |
| 33 | Gonzalo Ramírez# | 3.000 | 2032 | |
| 33 | Saiyid Mashwanis# | 3.000 | 2027 | |
| 35 | Cliff Clark | 3.048 | 2012 | |
| 36 | Edgar Pérez | 3.057 | 2019 | |
| 37 | Matt Calderón# | 3.156 | 2029 | |
| 38 | Raymond Riley# | 3.176 | 2030 | |
| 39 | Eisuke Ota# | 3.197 | 2026 | |
| 40 | Jake Robinson | 3.240 | 2019 | |
| 41 | José Contreras | 3.340 | 2015 | |
| 42 | Jason Atkinson | 3.375 | 2026 | |
| 43 | Hiroya Yoshida | 3.522 | 2018 | |
| 44 | Douglas Pantall# | 3.574 | 2032 | |
| 45 | Javier Hernández | 3.600 | 2017 | |
| 46 | James Stevens# | 3.661 | 2032 | |
| 47 | Tom Collins | 3.780 | 2019 | |
| 47 | Mehmood Dar# | 3.780 | 2020 | |
| 49 | António Encarnación | 3.938 | 2027 | |
| 50 | Gabresilassie Cherono# | 3.971 | 2021 | |
| 51 | Max Grant# | 4.014 | 2021 | |
| 52 | Jesús Díaz# | 4.021 | 2031 | |
| 53 | Terumoto Yamamoto | 4.050 | 2018 | |
| 54 | Garth Daniels# | 4.091 | 2026 | |
| 55 | James Thompson# | 4.109 | 2024 | |
| 56 | Jeremy Shaw# | 4.119 | 2029 | |
| 57 | Baltwin Baars# | 4.125 | 2024 | |
| 58 | Sakutaro Eida | 4.154 | 2014 | |
| 59 | Luis López | 4.190 | 2012 | |
| 60 | Frank Cronshaw# | 4.229 | 2026 | |
| 61 | Gonzalo Núñez | 4.355 | 2016 | |
| 62 | Kichibei Endo# | 4.426 | 2028 | |
| 63 | Alejandro García# | 4.438 | 2020 | |
| 64 | George Clay | 4.563 | 2021 | |
| 65 | Jin-song Cheung | 4.860 | 2019 | |
| 66 | Paul Johnston# | 5.034 | 2025 | |
| 67 | Tom Collins | 5.162 | 2023 | |
| 68 | Sam Hatt | 5.205 | 2022 | |
| 69 | Mehmood Dar# | 5.294 | 2021 | |
| 70 | Tom Hanson# | 5.510 | 2023 | |
| 71 | Adam Pitkeathy# | 5.571 | 2028 | |
| 72 | Matt Nolan# | 5.586 | 2030 | |
| 73 | Kang-il Hyong# | 6.061 | 2028 | |
| 74 | Ernesto Villegas# | 6.188 | 2023 | |
| 75 | Daniel Díaz | 6.857 | 2012 | |
| 76 | Fernando López# | 6.894 | 2026 | |
| 77 | David Duhamel | 7.200 | 2019 | |
| 78 | Julian Fanner# | 7.560 | 2028 | |
| 79 | Carl Veeck# | 7.788 | 2029 | |
| 80 | Nobuhiko Kobayashi | 12.600 | 2017 |
