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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Juan Acosta# | 0.000 | 2033 | |
| 1 | Sa-yoor Ch'oe# | 0.000 | 2035 | |
| 3 | Ken Stewart# | 0.409 | 2040 | |
| 4 | Randy Smith* | 0.422 | 2027 | |
| 5 | José Díaz | 0.562 | 2026 | |
| 6 | Héctor Rodríguez | 0.587 | 2012 | |
| 7 | José Hernández | 0.600 | 2026 | |
| 7 | Randy Smith* | 0.600 | 2024 | |
| 7 | Nelson Anderson | 0.600 | 2011 | |
| 10 | José Hernández | 0.635 | 2031 | |
| 11 | Conan McCullough* | 0.651 | 2013 | |
| 12 | Randy Smith* | 0.761 | 2026 | |
| 13 | Yukio Fujita | 0.794 | 2007 | |
| 14 | Ken Johnstone | 0.806 | 2008 | |
| 15 | Bryan Stewart | 0.831 | 2011 | |
| 16 | Gunner MacGruder* | 0.862 | 2020 | |
| 17 | Earl Lucas# | 0.885 | 2036 | |
| 18 | Glenn Thomas | 0.900 | 2029 | |
| 19 | George Moss# | 0.931 | 2039 | |
| 20 | Bryan Stewart | 0.964 | 2007 | |
| 21 | Luppe van Dam# | 0.991 | 2033 | |
| 22 | Jhong-shun Kong | 1.012 | 2019 | |
| 23 | Meiji Ishikawa# | 1.019 | 2040 | |
| 24 | Alfredo Gonzáles# | 1.025 | 2033 | |
| 25 | Luis Gusmán | 1.038 | 2021 | |
| 26 | Edgardo Trevino# | 1.080 | 2035 | |
| 27 | Conner Hurst | 1.091 | 2024 | |
| 28 | Scotty Shorland# | 1.125 | 2033 | |
| 29 | Kenny Ashley | 1.149 | 2025 | |
| 30 | Ding-bong Zhu# | 1.154 | 2041 | |
| 30 | Félix Ortega | 1.154 | 2013 | |
| 32 | Félix Maese | 1.174 | 2016 | |
| 32 | Kenny Ashley | 1.174 | 2024 | |
| 34 | Ángel Lara | 1.200 | 2011 | |
| 34 | Carlos Rivera | 1.200 | 2018 | |
| 34 | Brian Gutiérrez# | 1.200 | 2031 | |
| 34 | Rubén Hernández | 1.200 | 2023 | |
| 38 | Kijuro Kojima | 1.241 | 2014 | |
| 39 | Dean McNeil | 1.266 | 2026 | |
| 40 | Michel Provost* | 1.274 | 2023 | |
| 41 | Keitaro Kodo | 1.306 | 2013 | |
| 42 | Edward Coleman | 1.350 | 2008 | |
| 42 | Eric Elliott | 1.350 | 2029 | |
| 42 | Randy Smith* | 1.350 | 2022 | |
| 42 | Markus Hancock* | 1.350 | 2014 | |
| 46 | Javier Ferreira# | 1.367 | 2029 | |
| 47 | Jorge Castillo# | 1.397 | 2032 | |
| 48 | Félix Garza | 1.421 | 2021 | |
| 49 | Félix Maese | 1.467 | 2017 | |
| 49 | Markus Hancock* | 1.467 | 2016 | |
| 51 | Yakamochi Suitani* | 1.473 | 2024 | |
| 52 | Glenn Thomas | 1.500 | 2026 | |
| 52 | Zenko Okada# | 1.500 | 2033 | |
| 52 | Michel Provost* | 1.500 | 2022 | |
| 52 | Christian Murdoch | 1.500 | 2019 | |
| 56 | Víctor Matos | 1.521 | 2014 | |
| 56 | Dean O'Monahan* | 1.521 | 2015 | |
| 58 | Félix Maese | 1.543 | 2018 | |
| 59 | Luppe van Dam# | 1.562 | 2034 | |
| 60 | Kensaku Gato | 1.588 | 2022 | |
| 60 | Octávio Rivera | 1.588 | 2017 | |
| 62 | Xiao-mei Cheung# | 1.604 | 2037 | |
| 63 | Cheong-sang Yun# | 1.607 | 2034 | |
| 63 | Atílio Gaivo | 1.607 | 2022 | |
| 65 | Conan McCullough* | 1.627 | 2014 | |
| 66 | Felipe Lara | 1.636 | 2007 | |
| 66 | Enrique Vázquez* | 1.636 | 2033 | |
| 66 | Yakamochi Suitani* | 1.636 | 2022 | |
| 66 | Iván Hernández# | 1.636 | 2035 | |
| 70 | Tu-an Sima | 1.653 | 2011 | |
| 71 | Vincente Coronado | 1.662 | 2015 | |
| 72 | Conan McCullough* | 1.670 | 2008 | |
| 73 | Juan Acosta# | 1.688 | 2035 | |
| 73 | Norberto Pacheco | 1.688 | 2008 | |
| 73 | Scotty Shorland# | 1.688 | 2034 | |
| 76 | Ogai Ono# | 1.714 | 2035 | |
| 77 | Santiago Morales | 1.723 | 2017 | |
| 77 | Henry Cluett# | 1.723 | 2034 | |
| 79 | Eric Elliott | 1.734 | 2026 | |
| 80 | Colin Hopps | 1.753 | 2032 | |
| 81 | Marcel Osterhout# | 1.761 | 2032 | |
| 81 | Francisco Robles* | 1.761 | 2015 | |
| 81 | John Gray | 1.761 | 2030 | |
| 84 | Miguel Boroa# | 1.800 | 2040 | |
| 84 | Takanobu Shirai | 1.800 | 2031 | |
| 84 | José Tojeira# | 1.800 | 2034 | |
| 84 | Bob Burns# | 1.800 | 2039 | |
| 84 | Declan Littleworth | 1.800 | 2029 | |
| 84 | Jonathan Francis | 1.800 | 2023 | |
| 84 | Owen Barse# | 1.800 | 2033 | |
| 91 | Michel Provost* | 1.820 | 2025 | |
| 92 | Roberto Rodríguez | 1.835 | 2016 | |
| 93 | Brock Southey# | 1.846 | 2041 | |
| 94 | Kiyohira Goto# | 1.849 | 2039 | |
| 95 | Markus Hancock* | 1.862 | 2015 | |
| 95 | Ryan Dawson | 1.862 | 2012 | |
| 95 | Yasuoka Seki# | 1.862 | 2039 | |
| 98 | Kyoichi Yoshimura | 1.890 | 2024 | |
| 99 | Tony Cuellar | 1.895 | 2033 | |
| 100 | Markus Hancock* | 1.901 | 2021 |
