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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 | 2023-2034 | |
| 3 | Juan Guillén# | 2.76 | 2027-2034 | |
| 4 | John Wilkins* | 2.79 | 2015-2026 | |
| 5 | Walt Coffman# | 2.87 | 2026-2034 | |
| 6 | Lou Hartling | 2.88 | 2019-2030 | |
| 7 | Pedro Valdéz# | 2.95 | 2020-2033 | |
| 7 | Wes Hamm# | 2.95 | 2021-2034 | |
| 9 | Aurelio López# | 3.01 | 2022-2031 | |
| 10 | Wayne Craig | 3.27 | 2015-2023 | |
| 11 | Bobby Swain | 3.28 | 2020-2031 | |
| 12 | Hunter Wilson | 3.34 | 2019-2031 | |
| 13 | Paul Díaz | 3.36 | 2019-2030 | |
| 14 | Gary Bailey | 3.45 | 2022-2031 | |
| 15 | Vincent Hall | 3.46 | 2021-2031 | |
| 16 | Bartolomeu Lio# | 3.49 | 2019-2034 | |
| 16 | Allen Blair | 3.49 | 2015-2032 | |
| 18 | Truman Valentine# | 3.50 | 2022-2031 | |
| 19 | George Frazier# | 3.59 | 2017-2033 | |
| 20 | Nicholas Wells | 3.61 | 2019-2032 | |
| 20 | Wayne Hurst | 3.61 | 2015-2028 | |
| 22 | Pedro Castro | 3.66 | 2018-2032 | |
| 22 | Roderick Rhodes | 3.66 | 2017-2028 | |
| 24 | Arnie Pittman | 3.77 | 2022-2030 | |
| 24 | Héctor Alarcon | 3.77 | 2015-2027 | |
| 24 | Juan Torres# | 3.77 | 2021-2032 | |
| 24 | Kyle Boddy# | 3.77 | 2026-2034 | |
| 28 | Jeff Hale | 3.81 | 2014-2027 | |
| 29 | Cory Sanders# | 3.84 | 2021-2034 | |
| 29 | Manny Caraballo | 3.84 | 2022-2028 | |
| 31 | Rafael Rodríguez# | 3.85 | 2026-2031 | |
| 32 | Rafael Cardona# | 3.87 | 2022-2034 | |
| 32 | Francis McBride# | 3.87 | 2023-2027 | |
| 34 | Chip Bishop | 3.88 | 2018-2028 | |
| 35 | Rich Hunter | 3.96 | 2014-2021 | |
| 36 | Benny York | 3.98 | 2016-2027 | |
| 36 | Adrián Fierro | 3.98 | 2017-2032 | |
| 38 | Domingo Ramírez# | 3.99 | 2022-2034 | |
| 39 | Stanford McCain# | 4.02 | 2031-2034 | |
| 39 | John Holley | 4.02 | 2014-2022 | |
| 39 | Pat Horton | 4.02 | 2014-2019 | |
| 42 | Rafael Rivera# | 4.05 | 2027-2034 | |
| 43 | Nathaniel Riley | 4.07 | 2016-2030 | |
| 44 | Stanley Yelnats# | 4.10 | 2030-2034 | |
| 44 | Jon Dunn# | 4.10 | 2024-2034 | |
| 46 | John Woods# | 4.12 | 2024-2033 | |
| 47 | António Marés# | 4.13 | 2024-2031 | |
| 47 | John Braun | 4.13 | 2014-2022 | |
| 49 | Leslie Brooks | 4.16 | 2019-2030 | |
| 50 | Henry Hall | 4.17 | 2015-2026 | |
| 51 | Luis Torres# | 4.18 | 2024-2031 | |
| 51 | Andy Coker | 4.18 | 2016-2026 | |
| 53 | Félix Jiménez | 4.22 | 2018-2028 | |
| 54 | Gustavo Pérez# | 4.34 | 2027-2033 | |
| 55 | Allen Yohemas | 4.37 | 2022-2031 | |
| 56 | Juan Díaz# | 4.43 | 2025-2030 | |
| 57 | Aaron Wise | 4.46 | 2019-2029 | |
| 58 | Tyler MacHugh# | 4.49 | 2023-2033 | |
| 59 | Roger Garrett | 4.89 | 2014-2024 | |
| 60 | Robbie Baxter# | 4.98 | 2022-2034 | |
| 61 | Harris Howard | 5.04 | 2014-2017 |
