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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 | 2023-2037 | |
| 3 | John Wilkins* | 2.79 | 2015-2026 | |
| 4 | Wes Hamm | 2.91 | 2021-2037 | |
| 5 | Anatoly Ivanovich# | 2.94 | 2030-2038 | |
| 6 | Pedro Valdéz# | 2.95 | 2020-2037 | |
| 7 | Juan Guillén# | 3.00 | 2027-2038 | |
| 8 | Walt Coffman# | 3.13 | 2026-2038 | |
| 9 | Jesús Vidro# | 3.20 | 2033-2038 | |
| 10 | Wayne Craig | 3.27 | 2015-2023 | |
| 11 | Bobby Swain | 3.28 | 2020-2031 | |
| 12 | Paul Díaz | 3.36 | 2019-2030 | |
| 13 | Vincent Hall | 3.46 | 2021-2031 | |
| 14 | Bartolomeu Lio | 3.49 | 2019-2034 | |
| 14 | Allen Blair | 3.49 | 2015-2032 | |
| 16 | Matthew Fallows# | 3.56 | 2034-2038 | |
| 17 | Joe Pruitt# | 3.60 | 2031-2036 | |
| 18 | Nicholas Wells | 3.61 | 2019-2032 | |
| 18 | Wayne Hurst | 3.61 | 2015-2028 | |
| 20 | George Frazier | 3.62 | 2017-2036 | |
| 21 | Pedro Castro | 3.66 | 2018-2032 | |
| 21 | Roderick Rhodes | 3.66 | 2017-2028 | |
| 23 | Arnie Pittman | 3.77 | 2022-2030 | |
| 23 | Héctor Alarcon | 3.77 | 2015-2027 | |
| 23 | Juan Torres | 3.77 | 2021-2032 | |
| 26 | Jeff Hale | 3.81 | 2014-2027 | |
| 27 | Cory Sanders | 3.84 | 2021-2036 | |
| 27 | Manny Caraballo | 3.84 | 2022-2028 | |
| 29 | Chip Bishop | 3.88 | 2018-2028 | |
| 30 | Rafael Cardona | 3.93 | 2022-2035 | |
| 31 | Stanford McCain# | 3.98 | 2031-2037 | |
| 32 | John Holley | 4.02 | 2014-2022 | |
| 32 | Pat Horton | 4.02 | 2014-2019 | |
| 34 | Stanley Yelnats# | 4.03 | 2030-2038 | |
| 35 | Nathaniel Riley | 4.07 | 2016-2030 | |
| 36 | António Marés | 4.13 | 2024-2031 | |
| 36 | John Braun | 4.13 | 2014-2022 | |
| 38 | Luis Torres | 4.16 | 2024-2035 | |
| 39 | Henry Hall | 4.17 | 2015-2026 | |
| 40 | Andy Coker | 4.18 | 2016-2026 | |
| 41 | Félix Jiménez | 4.22 | 2018-2028 | |
| 42 | Juan Díaz | 4.23 | 2025-2036 | |
| 42 | Domingo Ramírez# | 4.23 | 2022-2038 | |
| 44 | Ton Jobse# | 4.34 | 2031-2037 | |
| 45 | Allen Yohemas | 4.37 | 2022-2031 | |
| 46 | Tyler MacHugh | 4.49 | 2023-2033 | |
| 47 | Robbie Baxter# | 4.90 | 2022-2037 |
