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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Kenji Aoki | 0.991 | 2035-2042 | |
| 2 | Yuri Volkers | 1.087 | 2013-2021 | |
| 3 | Mitchell Atwell | 1.116 | 2027-2039 | |
| 4 | Seong-hyeon Yi# | 1.167 | 2038-2045 | |
| 5 | Gavin Blackburn | 1.174 | 2018-2031 | |
| 5 | José Sánchez | 1.174 | 2027-2037 | |
| 7 | Taalay Ibragimov# | 1.262 | 2034-2045 | |
| 8 | Manny Amici | 1.378 | 2025-2037 | |
| 9 | Ted Locke | 1.421 | 2018-2026 | |
| 10 | Javier Dávila | 1.434 | 2024-2031 | |
| 11 | José Lucero | 1.500 | 2030-2039 | |
| 12 | Ismael Barrios | 1.636 | 2024-2026 | |
| 12 | Robinson Gonzáles | 1.636 | 2020-2031 | |
| 14 | Nand Lal Chaudhary | 1.662 | 2033-2040 | |
| 15 | Brandon Bannatyne | 1.785 | 2017-2032 | |
| 16 | Christian Mustard | 1.836 | 2028-2038 | |
| 17 | Roy Robinson* | 1.868 | 2013-2023 | |
| 18 | Roberto Ortega | 1.929 | 2019-2020 | |
| 19 | Maxime Janssens | 1.947 | 2030-2038 | |
| 20 | Joe Khokar# | 1.950 | 2034-2045 | |
| 21 | Nick Altrock# | 2.019 | 2040-2045 | |
| 22 | Todd Hines* | 2.031 | 2018-2032 | |
| 23 | Kenete Daku | 2.032 | 2031-2039 | |
| 24 | José Ramos | 2.043 | 2014-2023 | |
| 25 | Bryan Houston | 2.059 | 2020-2024 | |
| 26 | António Vega | 2.077 | 2013-2023 | |
| 27 | Armando Hernández | 2.152 | 2013-2018 | |
| 28 | Sjaak Bonne | 2.157 | 2025-2041 | |
| 29 | Pancho Padilla | 2.160 | 2024-2030 | |
| 30 | Torvald Geertsen | 2.170 | 2018-2024 | |
| 31 | Francisco Valdés | 2.186 | 2023-2034 | |
| 32 | Dave Reed | 2.204 | 2019-2031 | |
| 33 | Joe Kehoe | 2.213 | 2022-2028 | |
| 33 | Ron Rouse# | 2.213 | 2038-2045 | |
| 35 | Binjimen Victor# | 2.231 | 2038-2045 | |
| 36 | Mauro Guerra | 2.250 | 2024-2029 | |
| 36 | Juan Sánchez | 2.250 | 2020-2026 | |
| 38 | William Johnson | 2.261 | 2013-2018 | |
| 39 | James Callendar# | 2.265 | 2038-2045 | |
| 40 | Jaime Carrión | 2.274 | 2026-2030 | |
| 41 | Alfonso Zapata | 2.287 | 2020-2034 | |
| 42 | Jason Hubbell | 2.308 | 2020-2029 | |
| 43 | Jesús Gonzáles* | 2.314 | 2019-2030 | |
| 44 | Kyung-un Yi | 2.355 | 2020-2030 | |
| 45 | John Wilkins* | 2.356 | 2013-2028 | |
| 46 | Jesús Caldero | 2.376 | 2018-2027 | |
| 47 | Cordell Wilson | 2.391 | 2019-2030 | |
| 48 | Iván García | 2.415 | 2021-2035 | |
| 49 | Sozen Raikatuji* | 2.425 | 2016-2023 | |
| 50 | Miguel Rubia | 2.427 | 2029-2040 | |
| 51 | Javier Mora | 2.435 | 2022-2029 | |
| 52 | Santiago Alonza | 2.438 | 2027-2038 | |
| 53 | Amberlan Romubio# | 2.470 | 2038-2045 | |
| 54 | Denie Ulderink# | 2.473 | 2037-2045 | |
| 54 | Myles Wilkerson | 2.473 | 2026-2035 | |
| 56 | Aki Tanaka | 2.475 | 2018-2022 | |
| 57 | Enrico Reséndez | 2.480 | 2021-2033 | |
| 58 | Chester Henry | 2.500 | 2016-2023 | |
| 59 | Earnest Casey | 2.512 | 2018-2025 | |
| 59 | Piotr Oja | 2.512 | 2030-2034 | |
| 61 | Yoriyoshi Sugimoto | 2.537 | 2034-2042 | |
| 62 | Joy-shan Men# | 2.543 | 2036-2044 | |
| 63 | Anderson O'Mara | 2.551 | 2026-2036 | |
| 64 | Javier Ariza# | 2.571 | 2038-2045 | |
| 65 | Dale Hamilton | 2.587 | 2030-2042 | |
| 66 | Brian Fixel | 2.596 | 2028-2039 | |
| 66 | Asher Spivey | 2.596 | 2027-2035 | |
| 68 | Addie Samson | 2.609 | 2021-2035 | |
| 69 | Juan Chávez | 2.613 | 2018-2020 | |
| 69 | Craig Gasnier | 2.613 | 2021-2023 | |
| 69 | Tony Hernández | 2.613 | 2013-2025 | |
| 72 | José García | 2.634 | 2022-2035 | |
| 73 | Alejandro Guerra | 2.644 | 2027-2037 | |
| 74 | Jesús Franco | 2.650 | 2026-2033 | |
| 75 | Kent Good# | 2.654 | 2036-2044 | |
| 76 | Armando Garay | 2.679 | 2031-2040 | |
| 77 | Yajirobei Otomo | 2.683 | 2028-2039 | |
| 78 | Cristián Moreno# | 2.709 | 2034-2044 | |
| 79 | Edwin Ellis | 2.733 | 2013-2019 | |
| 80 | Tom Reynolds* | 2.738 | 2015-2028 | |
| 81 | Javier Ramírez | 2.739 | 2018-2027 | |
| 82 | Ryan Davis* | 2.747 | 2015-2026 | |
| 83 | Nicky Bogdan# | 2.749 | 2038-2045 | |
| 84 | Brewster Warble# | 2.755 | 2030-2045 | |
| 85 | Lúcio Sánchez* | 2.756 | 2017-2031 | |
| 86 | Dan Crowder | 2.759 | 2028-2037 | |
| 87 | Charles Dobson | 2.786 | 2024-2032 | |
| 88 | Christian Bates | 2.789 | 2019-2022 | |
| 89 | Shinzo Kumagai | 2.802 | 2029-2042 | |
| 90 | Mark Valle | 2.805 | 2028-2042 | |
| 91 | Jeff Territt | 2.832 | 2022-2033 | |
| 92 | Michael Fletcher | 2.842 | 2020-2024 | |
| 93 | Júlio Rodríguez | 2.847 | 2023-2041 | |
| 94 | Wayne Hurst | 2.857 | 2015-2024 | |
| 95 | John Kaufman* | 2.862 | 2017-2032 | |
| 96 | José Flores | 2.897 | 2019-2029 | |
| 97 | Virgil Dickerson# | 2.903 | 2042-2045 | |
| 97 | Jim Eliott* | 2.903 | 2014-2025 | |
| 97 | Felipe Machado | 2.903 | 2026-2035 | |
| 100 | Mario Peña | 2.922 | 2013-2023 |
