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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Ángel de Hoyos# | 1.675 | 1902-1910 | |
| 2 | Ángel Moreno# | 1.796 | 1902-1911 | |
| 3 | Normando Fraire# | 1.886 | 1902-1906 | |
| 4 | Ordoño Ortega | 2.049 | 1904-1912 | |
| 5 | Ciro Robledo | 2.125 | 1902-1910 | |
| 6 | Cameron Winter | 2.207 | 1901-1905 | |
| 7 | Aldo Rodríguez# | 2.656 | 1903-1914 | |
| 8 | Vladik Ofitserov | 2.673 | 1906-1911 | |
| 9 | Julio Morales# | 2.793 | 1907-1913 | |
| 10 | Richard Russell | 2.835 | 1901-1906 | |
| 11 | Norberto Hernández | 3.000 | 1903-1914 | |
| 12 | Braulio Paredes# | 3.011 | 1907-1914 | |
| 13 | Louis Cohen | 3.044 | 1901-1913 | |
| 14 | Martín León | 3.098 | 1902-1910 | |
| 15 | Scanlon O'Sullivan | 3.115 | 1901-1905 | |
| 16 | Matías Rivera# | 3.220 | 1903-1914 | |
| 17 | Esteban Quezada# | 3.228 | 1906-1913 | |
| 18 | José López# | 3.261 | 1907-1914 | |
| 19 | Sloan Mahoney# | 3.306 | 1908-1914 | |
| 20 | Zak Gardner | 3.336 | 1901-1910 | |
| 21 | Aidan Grant | 3.465 | 1901-1914 | |
| 22 | Lester Gill | 3.514 | 1901-1910 | |
| 23 | Zacarías Sosa | 3.559 | 1904-1913 | |
| 24 | Abenámar Martínez | 3.590 | 1903-1914 | |
| 25 | Jorge Flores# | 3.706 | 1906-1914 | |
| 26 | Padraic Quinlevan# | 3.750 | 1901-1901 | |
| 27 | Luis de Paula | 3.799 | 1905-1912 | |
| 28 | Ramón Carranza# | 3.857 | 1909-1914 | |
| 29 | Rob Murphy | 3.917 | 1901-1911 | |
| 30 | Luis Melchor# | 4.196 | 1906-1914 | |
| 31 | Billy Evans | 4.327 | 1901-1912 | |
| 32 | Miguel Gómez# | 4.385 | 1906-1914 | |
| 33 | Balduino Anaya | 4.470 | 1905-1911 | |
| 34 | Ricardo Márquez | 4.477 | 1906-1913 | |
| 35 | Dominic Hague | 4.852 | 1901-1913 | |
| 36 | Kian Sells | 4.891 | 1901-1913 | |
| 37 | Tony Stewart | 4.924 | 1901-1906 | |
| 38 | Ewan Baxter | 5.000 | 1901-1914 | |
| 39 | Aidan Clark | 5.430 | 1904-1910 | |
| 40 | Símaco Castrejón | 5.625 | 1909-1914 | |
| 41 | Harry Irvine | 5.786 | 1901-1909 | |
| 42 | Eher Byrne | 6.195 | 1901-1906 |
