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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Javier Mora | 2.60 | 2020-2034 | |
| 2 | Eddie Kop | 2.75 | 2023-2042 | |
| 3 | John Wilkins* | 2.79 | 2015-2026 | |
| 4 | Wes Hamm* | 2.91 | 2021-2037 | |
| 5 | Anatoly Ivanovich | 3.01 | 2030-2039 | |
| 6 | Pedro Valdéz | 3.04 | 2020-2040 | |
| 7 | Walt Coffman | 3.13 | 2026-2038 | |
| 8 | Juan Guillén | 3.15 | 2027-2039 | |
| 9 | Jesús Vidro# | 3.20 | 2033-2038 | |
| 10 | David Moore# | 3.25 | 2034-2043 | |
| 11 | Wayne Craig | 3.27 | 2015-2023 | |
| 12 | Bobby Swain | 3.28 | 2020-2031 | |
| 13 | Paul Díaz | 3.36 | 2019-2030 | |
| 14 | Vincent Hall | 3.46 | 2021-2031 | |
| 15 | Zhao-ji Qiu# | 3.48 | 2036-2043 | |
| 16 | Bartolomeu Lio | 3.49 | 2019-2034 | |
| 16 | Allen Blair | 3.49 | 2015-2032 | |
| 18 | Faisal bin Nabeel | 3.57 | 2034-2041 | |
| 19 | Joe Pruitt# | 3.60 | 2031-2039 | |
| 20 | Nicholas Wells | 3.61 | 2019-2032 | |
| 20 | Wayne Hurst | 3.61 | 2015-2028 | |
| 22 | George Frazier | 3.62 | 2017-2036 | |
| 23 | Matthew Fallows# | 3.63 | 2034-2043 | |
| 24 | Pedro Castro | 3.66 | 2018-2032 | |
| 24 | Roderick Rhodes | 3.66 | 2017-2028 | |
| 26 | Gustavo Tobías# | 3.76 | 2032-2042 | |
| 27 | Arnie Pittman | 3.77 | 2022-2030 | |
| 27 | Héctor Alarcon | 3.77 | 2015-2027 | |
| 27 | Juan Torres | 3.77 | 2021-2032 | |
| 30 | Jeff Hale | 3.81 | 2014-2027 | |
| 31 | Cory Sanders | 3.84 | 2021-2036 | |
| 31 | Manny Caraballo | 3.84 | 2022-2028 | |
| 33 | Chip Bishop | 3.88 | 2018-2028 | |
| 34 | Ratko Davidovic# | 3.91 | 2035-2043 | |
| 35 | Rafael Cardona | 3.93 | 2022-2035 | |
| 36 | Stanford McCain | 3.98 | 2031-2041 | |
| 37 | John Holley | 4.02 | 2014-2022 | |
| 37 | Pat Horton | 4.02 | 2014-2019 | |
| 39 | Stanley Yelnats | 4.03 | 2030-2038 | |
| 40 | Nathaniel Riley | 4.07 | 2016-2030 | |
| 41 | Lorenzo Fabián | 4.13 | 2029-2041 | |
| 41 | António Marés | 4.13 | 2024-2031 | |
| 41 | John Braun | 4.13 | 2014-2022 | |
| 44 | Luis Torres | 4.16 | 2024-2035 | |
| 45 | Henry Hall | 4.17 | 2015-2026 | |
| 46 | Andy Coker | 4.18 | 2016-2026 | |
| 47 | Félix Jiménez | 4.22 | 2018-2028 | |
| 48 | Juan Díaz | 4.23 | 2025-2036 | |
| 48 | Domingo Ramírez | 4.23 | 2022-2039 | |
| 50 | Ton Jobse# | 4.34 | 2031-2037 | |
| 51 | Allen Yohemas | 4.37 | 2022-2031 | |
| 52 | Anastasio Cabanillas Jr.# | 4.44 | 2037-2043 | |
| 53 | Tyler MacHugh | 4.49 | 2023-2033 | |
| 54 | Juan Moreno# | 4.53 | 2037-2043 | |
| 55 | Robbie Baxter | 4.90 | 2022-2037 | |
| 56 | Roger Rodenburg# | 5.97 | 2036-2042 |
