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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Gavin Blackburn | 0.92 | 2017-2032 | |
| 2 | Jesús Franco# | 1.18 | 2028-2034 | |
| 3 | Ambrose Randall# | 1.44 | 2027-2031 | |
| 4 | Leroy Moody | 1.51 | 2025-2033 | |
| 5 | John Woods | 1.55 | 2024-2033 | |
| 6 | Tom Reynolds* | 1.59 | 2015-2027 | |
| 6 | Jesús Vidro# | 1.59 | 2033-2037 | |
| 8 | David Moore# | 1.65 | 2034-2035 | |
| 9 | John Dempsey | 1.72 | 2022-2036 | |
| 10 | Luis Peńa | 1.75 | 2025-2031 | |
| 10 | Roderick Rhodes | 1.75 | 2017-2028 | |
| 12 | Júlio Palma | 1.85 | 2023-2031 | |
| 13 | Eddie Kop# | 1.87 | 2023-2037 | |
| 14 | Lynwood Matos | 1.93 | 2021-2031 | |
| 14 | Júlio Rodríguez# | 1.93 | 2023-2037 | |
| 16 | Marcos Oquendo# | 2.03 | 2030-2035 | |
| 17 | Rusty Swanson# | 2.04 | 2025-2037 | |
| 18 | Víctor García | 2.08 | 2023-2036 | |
| 19 | Pedro Valdéz# | 2.10 | 2020-2037 | |
| 20 | Juan Guillén# | 2.16 | 2027-2036 | |
| 21 | Juan Torres | 2.17 | 2021-2032 | |
| 22 | Dorian Daly | 2.20 | 2028-2036 | |
| 22 | Bradley Roth# | 2.20 | 2032-2036 | |
| 24 | Javier Mora | 2.21 | 2020-2034 | |
| 25 | Ramón Ortega* | 2.27 | 2015-2024 | |
| 25 | Myles Wilkerson | 2.27 | 2028-2034 | |
| 27 | Austin Stewart | 2.30 | 2021-2030 | |
| 28 | Faisal bin Nabeel# | 2.40 | 2034-2037 | |
| 29 | Cole Hall | 2.42 | 2016-2027 | |
| 30 | Gerardo Pagán# | 2.45 | 2027-2036 | |
| 31 | Cory Sanders | 2.47 | 2021-2036 | |
| 31 | Reid Garner | 2.47 | 2015-2022 | |
| 33 | Jesús Gonzáles | 2.48 | 2020-2031 | |
| 34 | John Kaufman | 2.52 | 2015-2032 | |
| 34 | Leroy Picot | 2.52 | 2021-2027 | |
| 36 | Fernando Rivero | 2.57 | 2018-2020 | |
| 37 | Alfonso Zapata | 2.58 | 2020-2032 | |
| 37 | Quentin Bowers# | 2.58 | 2028-2037 | |
| 39 | Bobby Swain | 2.59 | 2020-2031 | |
| 39 | Ramón Molina | 2.59 | 2026-2035 | |
| 41 | Jesús Tejeda | 2.61 | 2023-2035 | |
| 42 | Ernest Torres | 2.65 | 2025-2031 | |
| 43 | Eijiro Takahashi | 2.68 | 2028-2034 | |
| 44 | Gustavo Tobías# | 2.70 | 2032-2036 | |
| 44 | Rex Hood | 2.70 | 2022-2027 | |
| 46 | Lou Meadows | 2.71 | 2016-2027 | |
| 47 | Billy Crawford | 2.72 | 2017-2025 | |
| 48 | Shuntavyious Primes-Willes | 2.79 | 2025-2035 | |
| 49 | Truman Valentine | 2.82 | 2022-2031 | |
| 50 | Wes Hamm | 2.83 | 2021-2037 | |
| 51 | José Muńóz# | 2.86 | 2027-2037 | |
| 51 | Juan Valéncia | 2.86 | 2025-2032 | |
| 53 | Manuel Delgadillo# | 2.89 | 2028-2037 | |
| 53 | Hunter Wilson | 2.89 | 2019-2031 | |
| 55 | Juan Pérez | 2.91 | 2020-2035 | |
| 55 | Javier Roldán | 2.91 | 2025-2032 | |
| 57 | Juan Júlio | 2.95 | 2018-2026 | |
| 57 | Bob Warford | 2.95 | 2018-2025 | |
| 59 | Eduardo Molina | 2.96 | 2022-2033 | |
| 60 | Jud White | 2.97 | 2014-2018 | |
| 60 | Pedro Ortíz# | 2.97 | 2020-2033 | |
| 62 | George Frazier# | 2.98 | 2017-2036 | |
| 63 | Eric Matson# | 3.00 | 2027-2036 | |
| 64 | Elroy Thompkins# | 3.01 | 2029-2037 | |
| 65 | Vincent Hall | 3.02 | 2021-2031 | |
| 66 | Art Adams | 3.03 | 2020-2031 | |
| 67 | Matt Harris | 3.05 | 2021-2030 | |
| 67 | Lorenzo Sánchez | 3.05 | 2020-2033 | |
| 69 | Allen Yohemas | 3.06 | 2022-2031 | |
| 70 | Wayne Craig | 3.09 | 2015-2023 | |
| 71 | Quintiliano Seixal | 3.10 | 2025-2037 | |
| 72 | Bill Oulton | 3.12 | 2021-2033 | |
| 72 | Dale West | 3.12 | 2018-2019 | |
| 74 | Matthew Fallows# | 3.13 | 2034-2037 | |
| 75 | Héctor Alarcon | 3.14 | 2015-2027 | |
| 76 | Chris Holland# | 3.15 | 2035-2037 | |
| 77 | Ton Jobse# | 3.17 | 2031-2037 | |
| 78 | Pedro Alejándrez | 3.19 | 2022-2034 | |
| 79 | Jorge Otero# | 3.21 | 2030-2037 | |
| 80 | Aurelio López# | 3.22 | 2022-2037 | |
| 81 | Pedro Castro | 3.25 | 2018-2032 | |
| 82 | Addie Samson | 3.26 | 2023-2035 | |
| 82 | Joe Pruitt# | 3.26 | 2031-2036 | |
| 84 | Alexis Zambaco# | 3.27 | 2028-2037 | |
| 85 | Keisuke Nishida | 3.28 | 2027-2032 | |
| 85 | John Wilkins* | 3.28 | 2015-2026 | |
| 87 | Michael Machen# | 3.30 | 2029-2037 | |
| 88 | Neil Gilliam | 3.31 | 2020-2026 | |
| 88 | Allen Blair | 3.31 | 2015-2032 | |
| 90 | Leon von Stroheim# | 3.32 | 2034-2037 | |
| 90 | Finn Wuilink | 3.32 | 2028-2035 | |
| 92 | Bill Tugwell# | 3.36 | 2029-2034 | |
| 93 | Neil Franson# | 3.38 | 2032-2036 | |
| 93 | Torvald Geertsen | 3.38 | 2018-2021 | |
| 93 | Lou Hartling | 3.38 | 2019-2030 | |
| 96 | Wayne Hurst | 3.39 | 2015-2028 | |
| 97 | Kyuichi Hori# | 3.41 | 2031-2035 | |
| 97 | Stanley Yelnats# | 3.41 | 2030-2036 | |
| 99 | Jeff Mahl# | 3.43 | 2035-2037 | |
| 99 | Andy Coker | 3.43 | 2016-2026 |
