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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Mark Murchison | 1.009 | 2019-2032 | |
| 2 | Ross Higgins | 1.490 | 2007-2023 | |
| 3 | Louis Genest | 1.558 | 2007-2019 | |
| 4 | Guillermo Martínez | 1.562 | 2009-2019 | |
| 5 | Raúl Saltines | 1.588 | 2025-2037 | |
| 6 | Mike Henley | 1.629 | 2010-2022 | |
| 7 | Santiago González | 1.688 | 2017-2031 | |
| 8 | Jaime Espinoza | 1.714 | 2024-2039 | |
| 9 | Dave White | 1.742 | 2037-2045 | |
| 10 | Travis Sharp# | 1.765 | 2039-2049 | |
| 11 | Robinson Gonzáles | 1.785 | 2015-2033 | |
| 12 | Tony Rocha | 1.849 | 2016-2035 | |
| 13 | Manuel Parra | 1.912 | 2016-2030 | |
| 14 | Valentín Reséndez | 1.954 | 2022-2036 | |
| 15 | José Marte# | 2.017 | 2045-2049 | |
| 16 | José Orozco | 2.139 | 2010-2024 | |
| 17 | Ben Williams# | 2.160 | 2042-2048 | |
| 18 | Wes Slaughter# | 2.166 | 2044-2049 | |
| 19 | Ricardo García | 2.189 | 2010-2024 | |
| 20 | Keith Clow | 2.204 | 2007-2015 | |
| 21 | Reagan Wear* | 2.207 | 2015-2032 | |
| 22 | Oliver Donahue | 2.231 | 2010-2019 | |
| 23 | Mal Windham | 2.271 | 2011-2019 | |
| 24 | José Murillo | 2.274 | 2007-2019 | |
| 25 | Sergio Hernández# | 2.282 | 2038-2049 | |
| 26 | Júlio Dávila# | 2.294 | 2043-2049 | |
| 27 | Tommy Smith | 2.296 | 2009-2026 | |
| 28 | Alfredo González | 2.333 | 2010-2020 | |
| 29 | Tim Pugh# | 2.368 | 2041-2049 | |
| 30 | Bill Allan | 2.372 | 2013-2026 | |
| 31 | Jonathon Hernández# | 2.382 | 2038-2049 | |
| 32 | Dave Seagraves# | 2.406 | 2046-2049 | |
| 33 | Albert Lebel* | 2.412 | 2017-2032 | |
| 34 | Scott Hill* | 2.413 | 2007-2027 | |
| 35 | José Hidalgo | 2.455 | 2018-2029 | |
| 36 | Adrian Marshall | 2.492 | 2007-2011 | |
| 37 | John Stricker | 2.505 | 2009-2018 | |
| 38 | Joe Cameron* | 2.559 | 2011-2026 | |
| 39 | Andrés Vázquez | 2.563 | 2024-2036 | |
| 40 | Mike Fisher | 2.571 | 2016-2031 | |
| 41 | Assi Zaid# | 2.587 | 2035-2047 | |
| 42 | Takehide Ono | 2.589 | 2016-2030 | |
| 43 | Hyo-chin Kim | 2.599 | 2016-2033 | |
| 44 | José Valdéz | 2.616 | 2022-2035 | |
| 45 | Matt Parker | 2.621 | 2027-2035 | |
| 46 | Pedro Pagán# | 2.627 | 2037-2049 | |
| 47 | José Gómez | 2.634 | 2007-2026 | |
| 48 | Luis Valentín | 2.639 | 2019-2029 | |
| 49 | Brad Rowland | 2.676 | 2029-2040 | |
| 50 | Christian Caine# | 2.678 | 2034-2047 | |
| 51 | Robert Reeves | 2.732 | 2018-2029 | |
| 52 | David Simpson | 2.736 | 2021-2040 | |
| 53 | Arturo Medrano | 2.746 | 2018-2026 | |
| 54 | Manny Sandoval | 2.752 | 2019-2033 | |
| 55 | Matthew Scott | 2.755 | 2027-2037 | |
| 56 | Carlos Arévalo | 2.793 | 2009-2019 | |
| 57 | León Manuel# | 2.832 | 2037-2049 | |
| 58 | Pablo Cabral | 2.842 | 2020-2032 | |
| 58 | José Martínez | 2.842 | 2007-2013 | |
| 60 | Francisco Ríos | 2.849 | 2015-2032 | |
| 61 | Walter Bamber* | 2.855 | 2010-2025 | |
| 62 | Daniel Morris | 2.856 | 2007-2025 | |
| 63 | Manuel Rodríguez | 2.867 | 2007-2013 | |
| 63 | Jaime Sáenz | 2.867 | 2011-2023 | |
| 65 | Edward Cadle | 2.872 | 2016-2030 | |
| 66 | Mark Barber# | 2.890 | 2042-2049 | |
| 67 | Joe MacAslan# | 2.909 | 2039-2048 | |
| 68 | Aurelio Ramos | 2.930 | 2007-2017 | |
| 69 | Gerald Johnson | 2.935 | 2019-2033 | |
| 70 | Armando Pérez | 2.959 | 2017-2029 | |
| 71 | Sloan Sanders | 2.967 | 2030-2039 | |
| 72 | Derek Larkin | 2.970 | 2012-2023 | |
| 72 | Junior Limond# | 2.970 | 2048-2049 | |
| 74 | José Martínez* | 3.044 | 2023-2038 | |
| 75 | Rod Adams | 3.045 | 2021-2036 | |
| 76 | David Flanagan# | 3.046 | 2038-2049 | |
| 77 | Carlos Clemente* | 3.049 | 2009-2023 | |
| 78 | Tyler Richter# | 3.115 | 2037-2047 | |
| 79 | António López | 3.121 | 2013-2030 | |
| 80 | Masutaro Koyama* | 3.125 | 2019-2038 | |
| 81 | Ed Pritchard# | 3.129 | 2041-2049 | |
| 82 | Rodrigo Aguilar | 3.133 | 2015-2029 | |
| 83 | Ryan Dean | 3.136 | 2031-2042 | |
| 84 | Jun Matsuura# | 3.155 | 2038-2049 | |
| 85 | Eduardo Trujillo | 3.185 | 2021-2033 | |
| 86 | Jorge Cossutta# | 3.194 | 2044-2049 | |
| 86 | Lonnie Cullman | 3.194 | 2038-2045 | |
| 88 | Dan Ramsey | 3.208 | 2033-2045 | |
| 89 | Cris Gonzáles# | 3.214 | 2043-2048 | |
| 90 | Oscar Wheeler | 3.219 | 2018-2031 | |
| 91 | Pierre Deschênes | 3.220 | 2017-2027 | |
| 92 | Étienne Garcia | 3.224 | 2015-2030 | |
| 93 | Martín Lópes | 3.228 | 2012-2023 | |
| 94 | Jesús De Los Santos | 3.231 | 2027-2041 | |
| 95 | Warren Piniella | 3.233 | 2011-2024 | |
| 96 | Jimmy Sanders | 3.240 | 2007-2016 | |
| 97 | Guan-cai Yong | 3.250 | 2028-2036 | |
| 98 | Nick Herbert | 3.254 | 2010-2022 | |
| 99 | Frank Jackson | 3.259 | 2023-2034 | |
| 100 | Vic Niekro# | 3.277 | 2048-2049 |
