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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Rod Johnston | 2.022 | 1958-1961 | |
| 2 | José García | 2.048 | 1953-1956 | |
| 3 | Andy Flowers* | 2.059 | 1955-1959 | |
| 4 | Jason Sanders | 2.061 | 1952-1955 | |
| 5 | Travis Brown | 2.137 | 1961-1964 | |
| 6 | José Álvarez | 2.200 | 1961-1966 | |
| 7 | Anthony Moore | 2.250 | 1961-1964 | |
| 8 | Raúl Jiménez | 2.278 | 1962-1966 | |
| 9 | Jim Morton* | 2.309 | 1961-1964 | |
| 10 | Hugo Brederode | 2.317 | 1963-1968 | |
| 11 | Sergio Vásquez | 2.328 | 1966-1969 | |
| 12 | Davis Ayliffe# | 2.330 | 1978-1981 | |
| 13 | Freddy Rosado | 2.333 | 1957-1960 | |
| 14 | Pat Miller | 2.417 | 1957-1960 | |
| 15 | Woodrow Davis* | 2.502 | 1954-1957 | |
| 16 | Freddy Pérez | 2.597 | 1958-1961 | |
| 17 | William Wilson# | 2.625 | 1979-1983 | |
| 18 | Jeff Brown | 2.630 | 1955-1959 | |
| 19 | Jimmy Bacon# | 2.631 | 1972-1974 | |
| 20 | Francisco Rivera | 2.637 | 1971-1974 | |
| 21 | Nicholas Cassidy | 2.638 | 1969-1972 | |
| 22 | Orlando Ramírez | 2.789 | 1977-1981 | |
| 23 | Cris Vilardebo# | 2.818 | 1982-1986 | |
| 24 | Manuel Castaneda | 2.846 | 1948-1951 | |
| 25 | John López | 2.872 | 1965-1968 | |
| 26 | William Lee# | 2.874 | 1983-1986 | |
| 27 | Steve Ferguson# | 2.930 | 1973-1978 | |
| 28 | Sancho Hernández# | 2.985 | 1983-1986 | |
| 29 | Jim Lyons | 3.000 | 1963-1966 | |
| 30 | Claudio Romero# | 3.002 | 1976-1980 | |
| 31 | Chris Reynolds* | 3.119 | 1911-1914 | |
| 32 | José Molina | 3.131 | 1962-1967 | |
| 33 | Cam Knap | 3.147 | 1967-1971 | |
| 34 | Ricardo Rico# | 3.174 | 1970-1973 | |
| 35 | Curtis Orr | 3.190 | 1911-1915 | |
| 35 | Ambrose Sanders# | 3.190 | 1977-1980 | |
| 37 | Danny Ventura# | 3.200 | 1987-1990 | |
| 38 | Lorenzo Espinoza | 3.274 | 1959-1963 | |
| 39 | Norm Harris# | 3.315 | 1983-1986 | |
| 40 | Duncan Johnson# | 3.407 | 1988-1991 | |
| 41 | Rob Davis# | 3.470 | 1976-1979 | |
| 42 | Kevin Pollock# | 3.483 | 1971-1974 | |
| 43 | Armando Rivera | 3.494 | 1919-1922 | |
| 44 | Félix Díaz | 3.516 | 1966-1969 | |
| 45 | Teddy Turner | 3.659 | 1974-1977 | |
| 46 | Alejandro Sánchez | 3.770 | 1936-1939 | |
| 47 | Louis Hutchinson# | 3.771 | 1979-1982 | |
| 48 | Cliff James | 3.860 | 1958-1961 | |
| 49 | Sonny Lawrence | 3.865 | 1960-1963 | |
| 50 | Dan Nelson | 3.910 | 1964-1967 | |
| 51 | Bill López | 3.922 | 1947-1950 | |
| 52 | Alfredo Enríquez# | 4.015 | 1983-1986 | |
| 53 | Chris Thompson | 4.078 | 1974-1977 | |
| 54 | Jack Ashley | 4.090 | 1957-1960 | |
| 55 | Luis Martínez | 4.109 | 1968-1972 | |
| 56 | Richard Ward* | 4.203 | 1919-1922 | |
| 57 | Lorenzo Maldonado | 4.239 | 1973-1976 | |
| 58 | Peter Alexander# | 4.284 | 1982-1985 | |
| 59 | Gustavo Miranda# | 4.312 | 1975-1978 | |
| 60 | Domingo Fajardo | 4.324 | 1927-1930 | |
| 61 | Ryan Duncan | 4.332 | 1941-1944 | |
| 62 | Eric Carlisle | 4.366 | 1927-1930 | |
| 63 | Allen Haynes | 4.479 | 1974-1977 | |
| 64 | Eduardo Delpino# | 4.486 | 1976-1980 | |
| 65 | Gustavo Salas | 4.554 | 1927-1930 | |
| 66 | Pat Egglestone | 4.581 | 1935-1938 | |
| 67 | Mal Wright | 4.644 | 1916-1919 | |
| 68 | Clancy Swanson | 4.763 | 1944-1948 | |
| 69 | Blake Johnson | 4.828 | 1957-1960 | |
| 70 | Ángel Lombos | 4.885 | 1918-1921 | |
| 71 | Brock Tebby | 5.022 | 1937-1940 | |
| 72 | Kel Brooks* | 5.027 | 1927-1930 | |
| 73 | Tom Hayes | 5.161 | 1935-1938 | |
| 74 | Ron Griffin | 5.168 | 1926-1929 | |
| 75 | Jeff Rainey# | 5.230 | 1976-1980 | |
| 75 | Steve Sommer | 5.230 | 1936-1938 | |
| 77 | Dave Carter | 5.492 | 1919-1923 | |
| 78 | Armando Rea | 5.811 | 1926-1929 | |
| 79 | Kevin Barnett | 6.462 | 1930-1933 | |
| 80 | Yannick Goor | 7.796 | 1936-1939 | |
| 81 | Keith Hayes | 8.165 | 1931-1935 |
