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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 | 2020-2028 | |
| 2 | John Wilkins# | 2.79 | 2015-2026 | |
| 3 | Lynwood Matos# | 2.83 | 2021-2028 | |
| 4 | Eddie Kop# | 2.86 | 2023-2028 | |
| 5 | Lou Hartling# | 2.87 | 2019-2027 | |
| 6 | Wes Hamm# | 2.91 | 2021-2027 | |
| 7 | Pedro Valdéz# | 2.95 | 2020-2028 | |
| 8 | Aurelio López# | 3.01 | 2022-2027 | |
| 9 | Bobby Swain# | 3.12 | 2020-2028 | |
| 10 | Hunter Wilson# | 3.16 | 2019-2028 | |
| 11 | Paul Díaz# | 3.26 | 2019-2028 | |
| 12 | Wayne Craig# | 3.27 | 2015-2023 | |
| 13 | Domingo Álvarez# | 3.29 | 2022-2028 | |
| 14 | Bartolomeu Lio# | 3.36 | 2019-2028 | |
| 15 | Gary Bailey# | 3.45 | 2022-2026 | |
| 15 | Allen Blair# | 3.45 | 2015-2028 | |
| 17 | Nicholas Wells# | 3.48 | 2019-2028 | |
| 18 | Rafael Cardona# | 3.49 | 2022-2028 | |
| 19 | Wayne Hurst# | 3.61 | 2015-2028 | |
| 19 | Cole Hall | 3.61 | 2016-2027 | |
| 21 | Víctor García# | 3.65 | 2023-2028 | |
| 22 | Pedro Castro# | 3.66 | 2018-2028 | |
| 22 | Roderick Rhodes# | 3.66 | 2017-2028 | |
| 22 | Decheng Sun# | 3.66 | 2018-2028 | |
| 25 | Ron Stone# | 3.71 | 2024-2028 | |
| 26 | Ricardo Hernández | 3.74 | 2014-2018 | |
| 27 | Héctor Alarcon# | 3.77 | 2015-2027 | |
| 27 | Cory Sanders# | 3.77 | 2021-2026 | |
| 29 | Jeff Hale | 3.81 | 2014-2027 | |
| 30 | Manny Caraballo# | 3.84 | 2022-2028 | |
| 31 | Arnie Pittman# | 3.87 | 2022-2027 | |
| 31 | Francis McBride# | 3.87 | 2023-2027 | |
| 33 | Chip Bishop# | 3.88 | 2018-2028 | |
| 34 | Guillermo Pérez | 3.92 | 2015-2025 | |
| 34 | Adrián Fierro# | 3.92 | 2017-2026 | |
| 36 | Michael Battle | 3.94 | 2017-2021 | |
| 37 | Tyler MacHugh# | 3.95 | 2023-2028 | |
| 38 | Rich Hunter | 3.96 | 2014-2021 | |
| 39 | Benny York# | 3.98 | 2016-2027 | |
| 40 | John Holley | 4.02 | 2014-2022 | |
| 40 | Pat Horton | 4.02 | 2014-2019 | |
| 42 | Aaron Wise# | 4.12 | 2019-2028 | |
| 42 | Bob Warford# | 4.12 | 2018-2025 | |
| 44 | Christian Pitts | 4.13 | 2017-2025 | |
| 44 | John Braun | 4.13 | 2014-2022 | |
| 46 | Nathaniel Riley# | 4.14 | 2016-2028 | |
| 47 | António Marés# | 4.15 | 2024-2028 | |
| 48 | Leslie Brooks# | 4.16 | 2019-2028 | |
| 48 | John Woods# | 4.16 | 2024-2028 | |
| 50 | Henry Hall# | 4.17 | 2015-2026 | |
| 51 | Andy Coker# | 4.18 | 2016-2026 | |
| 52 | Juan Díaz# | 4.22 | 2025-2028 | |
| 52 | Félix Jiménez# | 4.22 | 2018-2028 | |
| 54 | Carl Snyder | 4.26 | 2016-2021 | |
| 55 | Kirby Brown# | 4.27 | 2014-2025 | |
| 56 | Albert Emery# | 4.29 | 2016-2026 | |
| 57 | Allen Yohemas# | 4.32 | 2022-2028 | |
| 58 | Joe Ellis | 4.52 | 2016-2021 | |
| 59 | Robbie Baxter# | 4.76 | 2022-2028 | |
| 60 | Roger Garrett | 4.89 | 2014-2024 | |
| 61 | Harris Howard | 5.04 | 2014-2017 | |
| 62 | Felipe Velázquez | 5.05 | 2017-2022 | |
| 63 | Jud White | 5.15 | 2014-2018 | |
| 64 | Drake Montgomery | 5.19 | 2015-2020 |
