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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Juan Guillén# | 2.40 | 2027-2030 | |
| 2 | Javier Mora# | 2.60 | 2020-2031 | |
| 3 | John Wilkins | 2.79 | 2015-2026 | |
| 4 | Lynwood Matos# | 2.83 | 2021-2031 | |
| 5 | Eddie Kop# | 2.86 | 2023-2030 | |
| 6 | Lou Hartling | 2.88 | 2019-2030 | |
| 7 | Wes Hamm# | 2.91 | 2021-2027 | |
| 8 | Pedro Valdéz# | 2.95 | 2020-2031 | |
| 9 | Aurelio López# | 3.01 | 2022-2031 | |
| 10 | Germán Rodríguez# | 3.03 | 2025-2031 | |
| 11 | Wayne Craig# | 3.27 | 2015-2023 | |
| 12 | Bobby Swain# | 3.28 | 2020-2031 | |
| 13 | Hunter Wilson# | 3.34 | 2019-2031 | |
| 14 | Paul Díaz | 3.36 | 2019-2030 | |
| 15 | Bartolomeu Lio# | 3.40 | 2019-2031 | |
| 16 | Gary Bailey# | 3.45 | 2022-2031 | |
| 16 | Allen Blair# | 3.45 | 2015-2031 | |
| 18 | Vincent Hall# | 3.46 | 2021-2031 | |
| 19 | Truman Valentine# | 3.50 | 2022-2031 | |
| 20 | Nicholas Wells# | 3.57 | 2019-2029 | |
| 21 | Juan Torres# | 3.59 | 2021-2031 | |
| 22 | George Frazier# | 3.60 | 2017-2031 | |
| 23 | Wayne Hurst | 3.61 | 2015-2028 | |
| 24 | Domingo Ramírez# | 3.63 | 2022-2030 | |
| 25 | Pedro Castro# | 3.66 | 2018-2029 | |
| 25 | Roderick Rhodes | 3.66 | 2017-2028 | |
| 27 | Ricardo Hernández | 3.74 | 2014-2018 | |
| 28 | Arnie Pittman# | 3.77 | 2022-2030 | |
| 28 | Héctor Alarcon# | 3.77 | 2015-2027 | |
| 30 | Cory Sanders# | 3.80 | 2021-2031 | |
| 31 | Jeff Hale | 3.81 | 2014-2027 | |
| 32 | Manny Caraballo# | 3.84 | 2022-2028 | |
| 33 | Rafael Rodríguez# | 3.85 | 2026-2031 | |
| 34 | Francis McBride# | 3.87 | 2023-2027 | |
| 35 | Rafael Cardona# | 3.88 | 2022-2030 | |
| 35 | Chip Bishop | 3.88 | 2018-2028 | |
| 37 | Guillermo Pérez | 3.92 | 2015-2025 | |
| 38 | Michael Battle | 3.94 | 2017-2021 | |
| 39 | Rich Hunter | 3.96 | 2014-2021 | |
| 40 | Benny York | 3.98 | 2016-2027 | |
| 40 | Adrián Fierro# | 3.98 | 2017-2031 | |
| 42 | John Holley | 4.02 | 2014-2022 | |
| 42 | Pat Horton | 4.02 | 2014-2019 | |
| 44 | Rafael Rivera# | 4.05 | 2027-2031 | |
| 45 | Nathaniel Riley | 4.07 | 2016-2030 | |
| 46 | António Marés# | 4.13 | 2024-2031 | |
| 46 | John Braun | 4.13 | 2014-2022 | |
| 48 | Leslie Brooks# | 4.16 | 2019-2030 | |
| 48 | John Woods# | 4.16 | 2024-2031 | |
| 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# | 4.28 | 2027-2030 | |
| 55 | Tyler MacHugh# | 4.36 | 2023-2031 | |
| 56 | Allen Yohemas# | 4.37 | 2022-2031 | |
| 57 | Juan Díaz# | 4.43 | 2025-2030 | |
| 58 | Aaron Wise# | 4.46 | 2019-2029 | |
| 59 | Roger Garrett | 4.89 | 2014-2024 | |
| 60 | Robbie Baxter# | 4.94 | 2022-2031 | |
| 61 | Harris Howard | 5.04 | 2014-2017 | |
| 62 | Drake Montgomery | 5.19 | 2015-2020 |
