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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Joe Robinson | 0.000 | 2017 | |
| 1 | Greg Bailey | 0.000 | 2023 | |
| 1 | Dorian Mack# | 0.000 | 2040 | |
| 4 | Júlio Caraballo | 0.422 | 2033 | |
| 5 | Alfredo Fernández | 0.551 | 2016 | |
| 6 | Luis Leyva | 0.587 | 2016 | |
| 7 | Bill Spracklin | 0.871 | 2035 | |
| 8 | David Franklin | 0.982 | 2032 | |
| 9 | Luis Leyva | 1.019 | 2015 | |
| 10 | Ryoichi Endo# | 1.059 | 2048 | |
| 11 | Jorge Gómez | 1.080 | 2038 | |
| 12 | Craig Stewart | 1.125 | 2040 | |
| 12 | Adam Fedchenko | 1.125 | 2036 | |
| 14 | Bob MacKinley | 1.149 | 2043 | |
| 15 | Michael Calhoun | 1.174 | 2044 | |
| 16 | Michael Calhoun | 1.200 | 2045 | |
| 17 | Miguel Martínez | 1.306 | 2019 | |
| 18 | Brian Sweet | 1.350 | 2035 | |
| 18 | Fernando Márquez | 1.350 | 2035 | |
| 20 | Brian Hankins | 1.473 | 2034 | |
| 21 | Michael Calhoun | 1.688 | 2047 | |
| 22 | Mike Dwyer | 1.714 | 2025 | |
| 23 | David White | 1.770 | 2029 | |
| 24 | Jarred Benson | 1.800 | 2039 | |
| 24 | Jim Miller | 1.800 | 2032 | |
| 26 | Félix Mendoza | 1.831 | 2049 | |
| 27 | Takeichi Koike | 1.929 | 2017 | |
| 28 | Bubba McCall# | 1.957 | 2049 | |
| 29 | Horiuchi Morishita | 2.077 | 2013 | |
| 29 | Bernardo De Jesús# | 2.077 | 2047 | |
| 31 | Felipe Pérez | 2.104 | 2034 | |
| 32 | Raúl Medine | 2.160 | 2037 | |
| 33 | William Young | 2.288 | 2021 | |
| 33 | Ned Clark | 2.288 | 2016 | |
| 35 | Todd Brown# | 2.348 | 2037 | |
| 36 | César Esparza# | 2.368 | 2049 | |
| 36 | Raúl Morán | 2.368 | 2038 | |
| 38 | Michael Curtis# | 2.400 | 2049 | |
| 39 | Dave Turner | 2.411 | 2012 | |
| 40 | P.J. Woodard | 2.455 | 2017 | |
| 41 | Randolph Hutchison | 2.512 | 2019 | |
| 42 | Juan Leyva# | 2.547 | 2050 | |
| 43 | Will Lester | 2.554 | 2022 | |
| 44 | Jorge Perales | 2.812 | 2012 | |
| 44 | Matt Miller | 2.812 | 2015 | |
| 44 | Nakamaro Abe# | 2.812 | 2050 | |
| 47 | Toby Adams | 2.953 | 2044 | |
| 48 | Rory Taverner | 3.094 | 2024 | |
| 49 | Jarred Benson | 3.150 | 2041 | |
| 50 | Tim Stone# | 3.203 | 2049 | |
| 51 | Ignacio Rivera | 3.323 | 2041 | |
| 52 | Jack Sandford | 3.447 | 2031 | |
| 53 | Alberto Gómez | 3.522 | 2015 | |
| 54 | Nick Coomer | 3.566 | 2033 | |
| 55 | Wilbert Sutton | 3.661 | 2032 | |
| 56 | Jacob Foster | 3.780 | 2028 | |
| 57 | Juan Varela* | 3.803 | 2023 | |
| 58 | Doug Roberts | 3.857 | 2013 | |
| 59 | Diego López | 4.075 | 2024 | |
| 60 | Elias Rose | 4.183 | 2018 | |
| 61 | Michael Calhoun | 4.200 | 2046 | |
| 62 | Bill Tucker | 4.500 | 2029 | |
| 62 | Dave Beauchamp# | 4.500 | 2050 | |
| 64 | Brian Vaughan | 4.596 | 2026 | |
| 65 | Tomokazu Kamida | 4.641 | 2019 | |
| 66 | Ernesto González | 4.655 | 2040 | |
| 67 | Bob Collins | 5.094 | 2017 | |
| 68 | Artie Jackson | 5.192 | 2032 | |
| 69 | Bill Davis | 5.283 | 2037 | |
| 70 | Hunter Richardson | 5.906 | 2026 | |
| 71 | Doug Grimes | 6.188 | 2027 | |
| 72 | Grant Love | 6.231 | 2020 | |
| 73 | Duane Carter | 6.750 | 2025 | |
| 73 | Ken Russell* | 6.750 | 2022 | |
| 75 | Frank Heap# | 7.000 | 2047 | |
| 76 | Chris Hopkins | 7.163 | 2022 | |
| 77 | Robert Collard | 9.000 | 2029 |
