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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Rubén Martín# | 0.500 | 1907 | |
| 2 | Zak Gardner | 0.982 | 1907 | |
| 2 | Ángel Moreno# | 0.982 | 1910 | |
| 4 | Ángel Moreno# | 1.009 | 1905 | |
| 5 | Julio Morales# | 1.059 | 1908 | |
| 6 | Ewan Baxter | 1.350 | 1908 | |
| 7 | Nepomuceno García# | 1.397 | 1911 | |
| 8 | Ángel de Hoyos# | 1.409 | 1903 | |
| 9 | Normando Fraire# | 1.459 | 1904 | |
| 9 | Ángel Moreno# | 1.459 | 1907 | |
| 11 | Avelino Oliva# | 1.500 | 1909 | |
| 11 | Diego García# | 1.500 | 1912 | |
| 13 | Neftalí Cabrera# | 1.517 | 1913 | |
| 14 | Cameron Winter | 1.543 | 1903 | |
| 14 | Normando Fraire# | 1.543 | 1905 | |
| 16 | Ciro Robledo | 1.575 | 1903 | |
| 17 | Ciro Robledo | 1.588 | 1904 | |
| 17 | Richard Russell | 1.588 | 1901 | |
| 19 | Ángel de Hoyos# | 1.688 | 1905 | |
| 20 | Luis Melchor# | 1.731 | 1911 | |
| 21 | Scanlon O'Sullivan | 1.770 | 1901 | |
| 22 | Zacarías Sosa | 1.901 | 1913 | |
| 23 | Cameron Winter | 2.000 | 1904 | |
| 24 | Ciro Robledo | 2.038 | 1905 | |
| 25 | Ordoño Ortega | 2.057 | 1906 | |
| 26 | Ordoño Ortega | 2.097 | 1909 | |
| 27 | Abenámar Martínez | 2.285 | 1908 | |
| 28 | José López# | 2.314 | 1909 | |
| 29 | Norberto Hernández | 2.368 | 1905 | |
| 30 | Julio Morales# | 2.400 | 1912 | |
| 31 | Norberto Hernández | 2.406 | 1910 | |
| 32 | Braulio Paredes# | 2.480 | 1908 | |
| 33 | Antonio Triana# | 2.500 | 1903 | |
| 33 | Billy Evans | 2.500 | 1905 | |
| 33 | Kyle Williams | 2.500 | 1904 | |
| 33 | Jorge Flores# | 2.500 | 1912 | |
| 33 | Ramiro Rendón# | 2.500 | 1909 | |
| 38 | Zacarías Sosa | 2.523 | 1909 | |
| 39 | Norberto Hernández | 2.538 | 1904 | |
| 40 | Louis Cohen | 2.647 | 1903 | |
| 40 | Ewan Kelly | 2.647 | 1903 | |
| 40 | Derek Heath | 2.647 | 1902 | |
| 43 | Zak Gardner | 2.667 | 1903 | |
| 44 | Vladik Ofitserov | 2.673 | 1910 | |
| 45 | Sloan Mahoney# | 2.725 | 1911 | |
| 45 | Lester Gill | 2.725 | 1903 | |
| 47 | Normando Fraire# | 2.727 | 1902 | |
| 48 | Louis Cohen | 2.812 | 1909 | |
| 48 | Ricardo Márquez | 2.812 | 1913 | |
| 48 | Báquides Sánchez# | 2.812 | 1909 | |
| 51 | Sean Forrest | 2.864 | 1906 | |
| 51 | Trevor Cole | 2.864 | 1901 | |
| 53 | Matías Rivera# | 2.930 | 1912 | |
| 54 | Zak Gardner | 2.950 | 1902 | |
| 55 | Kian Sells | 2.959 | 1904 | |
| 56 | Miguel Gómez# | 2.963 | 1911 | |
| 57 | Julio Morales# | 2.970 | 1911 | |
| 58 | Martín León | 3.098 | 1904 | |
| 59 | Harry Irvine | 3.176 | 1903 | |
| 59 | Lester Gill | 3.176 | 1901 | |
| 61 | Esteban Quezada# | 3.228 | 1913 | |
| 61 | Braulio Paredes# | 3.228 | 1907 | |
| 63 | Aidan Grant | 3.273 | 1912 | |
| 64 | Rodulfo Camarena# | 3.316 | 1907 | |
| 65 | Ángel Moreno# | 3.343 | 1908 | |
| 66 | Braulio Paredes# | 3.375 | 1910 | |
| 67 | Aldo Rodríguez# | 3.405 | 1906 | |
| 68 | Richard Russell | 3.456 | 1902 | |
| 69 | Balduino Anaya | 3.500 | 1906 | |
| 70 | Luis de Paula | 3.570 | 1907 | |
| 71 | Tony Stewart | 3.635 | 1902 | |
| 72 | Matías Rivera# | 3.640 | 1911 | |
| 73 | Zak Gardner | 3.695 | 1908 | |
| 74 | Zak Gardner | 3.699 | 1905 | |
| 75 | Jorge Flores# | 3.706 | 1906 | |
| 75 | Ramón Piña | 3.706 | 1907 | |
| 77 | Julio Morales# | 3.734 | 1910 | |
| 78 | Padraic Quinlevan# | 3.750 | 1901 | |
| 79 | Sloan Mahoney# | 3.772 | 1912 | |
| 80 | Rob Murphy | 3.774 | 1907 | |
| 81 | Cameron Winter | 3.857 | 1901 | |
| 82 | Ramón Carranza# | 4.021 | 1913 | |
| 83 | Zak Gardner | 4.065 | 1901 | |
| 84 | Lorenzo Maldonado# | 4.109 | 1913 | |
| 85 | Aidan Clark | 4.125 | 1907 | |
| 86 | Eher Byrne | 4.154 | 1902 | |
| 87 | Dominic Hague | 4.200 | 1909 | |
| 88 | Aidan Clark | 4.235 | 1905 | |
| 88 | José López# | 4.235 | 1907 | |
| 90 | Luis de Paula | 4.243 | 1906 | |
| 91 | Hernán Ocampo# | 4.355 | 1913 | |
| 92 | Aidan Grant | 4.364 | 1908 | |
| 93 | Ewan Baxter | 4.463 | 1912 | |
| 94 | Scanlon O'Sullivan | 4.500 | 1902 | |
| 95 | Zak Gardner | 4.554 | 1910 | |
| 96 | Rob Murphy | 4.618 | 1906 | |
| 97 | Connor Pike | 4.765 | 1901 | |
| 98 | Eufrasio López | 4.846 | 1902 | |
| 98 | Lester Gill | 4.846 | 1902 | |
| 100 | Ricardo Márquez | 4.909 | 1906 |
