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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Tony Zavala | 3.38 | 2014-2023 | |
| 2 | John Haase | 3.41 | 2013-2027 | |
| 3 | Juan Guzman | 3.42 | 2017-2027 | |
| 4 | Rogelio Castro | 3.47 | 2013-2026 | |
| 5 | Samuel Rodledo# | 3.50 | 2024-2035 | |
| 6 | David Reimers | 3.56 | 2013-2021 | |
| 7 | Thomas Moore | 3.57 | 2013-2024 | |
| 7 | Pete Boyle# | 3.57 | 2027-2035 | |
| 9 | Gordon Gaddy | 3.67 | 2016-2026 | |
| 9 | Brian Harrington# | 3.67 | 2026-2034 | |
| 11 | Carlos Rivera# | 3.68 | 2025-2035 | |
| 12 | Pancho López | 3.71 | 2017-2023 | |
| 13 | Brian Thomas | 3.74 | 2016-2024 | |
| 14 | Alan Blessing | 3.80 | 2015-2023 | |
| 15 | Fred Jones | 3.84 | 2013-2020 | |
| 16 | Carl Shepherd | 3.99 | 2013-2018 | |
| 17 | Woodrow Claytor | 4.05 | 2014-2021 | |
| 18 | Alfredo Herrero | 4.11 | 2013-2021 | |
| 19 | John Hoffman | 4.17 | 2014-2026 | |
| 20 | Luis Martínez# | 4.18 | 2027-2035 | |
| 21 | Carlos Morales# | 4.19 | 2026-2034 | |
| 22 | Claudio Sánchez | 4.20 | 2021-2032 | |
| 23 | Kevin Gordon# | 4.21 | 2026-2035 | |
| 23 | Felipe Martínez | 4.21 | 2025-2033 | |
| 25 | Antonio Cuellar | 4.22 | 2015-2024 | |
| 25 | Lou Shaw | 4.22 | 2023-2035 | |
| 27 | Jorge Menéndez# | 4.25 | 2028-2035 | |
| 27 | Will Walker | 4.25 | 2025-2033 | |
| 29 | Armando Feliciano# | 4.26 | 2026-2035 | |
| 29 | Floyd Crown | 4.26 | 2016-2029 | |
| 31 | Agustin Vasco | 4.27 | 2014-2021 | |
| 32 | Coy Hendon | 4.28 | 2015-2022 | |
| 33 | Edgardo Barbosa | 4.29 | 2022-2032 | |
| 33 | Bill Critch | 4.29 | 2019-2031 | |
| 33 | Hun-ho Pang# | 4.29 | 2026-2035 | |
| 36 | Thomas Marcell | 4.32 | 2014-2023 | |
| 37 | Takeo Hagi# | 4.39 | 2026-2035 | |
| 37 | Jeff William# | 4.39 | 2027-2035 | |
| 37 | Shawn MacNeill | 4.39 | 2024-2033 | |
| 40 | Folkert Parrel | 4.40 | 2022-2033 | |
| 41 | Tsurugorou Shunko | 4.45 | 2013-2022 | |
| 42 | Jose Lamela | 4.47 | 2014-2023 | |
| 42 | Mark Tyler | 4.47 | 2022-2027 | |
| 42 | Balta Riojas | 4.47 | 2015-2023 | |
| 42 | Willian Stewart | 4.47 | 2013-2023 | |
| 46 | Noah Hill | 4.53 | 2022-2034 | |
| 47 | Earl Brown | 4.54 | 2014-2021 | |
| 48 | Larry Gabrielson | 4.56 | 2013-2020 | |
| 49 | Bill Mobley | 4.60 | 2023-2032 | |
| 50 | Jesse Decaro | 4.63 | 2014-2018 | |
| 50 | Michael Sanders | 4.63 | 2013-2025 | |
| 52 | Marc Powell | 4.65 | 2013-2024 | |
| 53 | Lewis Trapp | 4.70 | 2017-2026 | |
| 54 | David Vaccaro | 4.80 | 2013-2025 | |
| 55 | Jesús Cruz | 4.84 | 2026-2033 | |
| 56 | José Salazar# | 5.03 | 2027-2035 | |
| 57 | José Raias | 5.20 | 2021-2027 | |
| 58 | Jeff Baldwin# | 5.33 | 2023-2035 | |
| 59 | Peter Payton# | 5.65 | 2024-2032 |
