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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Ralph Dean | 1.218 | 2010-2013 | |
| 2 | Roberto Serrano# | 1.500 | 2026-2041 | |
| 3 | Carlos Moreno | 1.679 | 2007-2012 | |
| 4 | Norm Hawk | 2.042 | 2007-2013 | |
| 5 | Jesús Muñóz# | 2.100 | 2026-2042 | |
| 5 | Pedro Ramírez | 2.100 | 2007-2011 | |
| 7 | José Prieto# | 2.279 | 2030-2042 | |
| 8 | Félix Villalobas# | 2.295 | 2024-2042 | |
| 9 | Juan Rodríguez# | 2.531 | 2024-2042 | |
| 10 | Ramón Torres# | 2.545 | 2029-2042 | |
| 11 | Diego Quiñones# | 2.558 | 2033-2042 | |
| 12 | Álex Martínez | 2.732 | 2009-2017 | |
| 13 | Arthur Graham | 2.872 | 2013-2018 | |
| 14 | Luis Mendoza# | 2.935 | 2033-2042 | |
| 15 | Ricardo Martínez | 2.945 | 2027-2034 | |
| 16 | Luis Robles# | 3.048 | 2030-2041 | |
| 17 | José Bernal# | 3.054 | 2032-2042 | |
| 18 | António Flores# | 3.073 | 2028-2042 | |
| 19 | José Torres# | 3.289 | 2022-2042 | |
| 20 | Tony Alvarado# | 3.405 | 2037-2042 | |
| 21 | Manuel Muñóz# | 3.408 | 2027-2042 | |
| 22 | Raúl Pacheco | 3.490 | 2025-2038 | |
| 23 | David Hernández | 3.616 | 2008-2013 | |
| 24 | Jesús Mireles# | 3.635 | 2030-2042 | |
| 25 | Santiago Benítez# | 3.672 | 2028-2042 | |
| 26 | Carlos Flores# | 3.703 | 2030-2042 | |
| 27 | Pedro Reyes | 3.780 | 2025-2040 | |
| 28 | Ramón Villalobos# | 3.908 | 2028-2042 | |
| 29 | Juan Flores# | 3.913 | 2025-2042 | |
| 30 | Rafael Diéguez# | 4.050 | 2025-2042 | |
| 31 | Sergio Pinzón# | 4.140 | 2029-2042 | |
| 32 | Harry Sullivan | 4.301 | 2011-2012 | |
| 33 | Martín Silva | 4.596 | 2025-2039 | |
| 34 | Ricardo Encarnación# | 4.634 | 2039-2042 | |
| 35 | Carlos Cosme# | 4.705 | 2029-2042 | |
| 36 | César Soto | 4.732 | 2015-2030 | |
| 37 | Sergio López | 4.829 | 2016-2026 | |
| 38 | Pedro Garza | 4.926 | 2025-2034 | |
| 39 | Juan Cardenas | 4.989 | 2012-2030 | |
| 40 | José Pérez# | 5.052 | 2028-2042 | |
| 41 | Alejandro Soto# | 5.062 | 2037-2042 | |
| 42 | Ángel Rodríguez# | 5.767 | 2032-2042 | |
| 43 | Carlos Martínez# | 6.231 | 2033-2042 | |
| 44 | Manuel Arroyo | 6.537 | 2015-2036 | |
| 45 | Mario Mendoza | 6.750 | 2007-2017 | |
| 46 | Armando Tapia | 7.337 | 2007-2012 | |
| 47 | Luis Ramos | 8.629 | 2011-2026 |
