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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | José Marino | 2.813 | 1918-1924 | |
| 2 | Ramão Lumbrales | 3.131 | 1922-1929 | |
| 3 | Doug Lawrence | 3.170 | 1921-1925 | |
| 4 | Norris Kifer | 3.270 | 1924-1929 | |
| 5 | Ted Cunningham | 3.325 | 1926-1933 | |
| 6 | Billy Heiser | 3.327 | 1921-1930 | |
| 7 | James Brown | 3.356 | 1928-1934 | |
| 8 | Lorenzo Torres | 3.367 | 1927-1931 | |
| 9 | Carlos Cruz | 3.461 | 1957-1966 | |
| 10 | Tin-jong Siu | 3.468 | 1940-1946 | |
| 11 | Cary Hubbard | 3.501 | 1917-1926 | |
| 12 | Vic Vandermeer | 3.511 | 1924-1934 | |
| 13 | Daniel Torres | 3.520 | 1931-1942 | |
| 14 | Chris Bastien | 3.555 | 1937-1942 | |
| 15 | Stephen Reeves | 3.588 | 1924-1935 | |
| 16 | Tadamasa Kimura | 3.591 | 1934-1944 | |
| 17 | António Morales | 3.651 | 1916-1928 | |
| 18 | Miguel Torres | 3.674 | 1940-1944 | |
| 19 | Emílio García | 3.688 | 1945-1957 | |
| 20 | Hugo Olivier | 3.696 | 1934-1942 | |
| 21 | Kevin Holmes# | 3.697 | 1977-1990 | |
| 22 | Gabriel Ramírez | 3.707 | 1921-1929 | |
| 23 | Louis Dillon | 3.719 | 1960-1972 | |
| 24 | Joep de Vlaming | 3.748 | 1941-1947 | |
| 25 | Allen Ash | 3.770 | 1925-1932 | |
| 26 | Josh Jenkins | 3.793 | 1921-1927 | |
| 27 | Germán López | 3.797 | 1940-1947 | |
| 28 | Aurélien Bob | 3.869 | 1945-1947 | |
| 29 | Alonso González | 3.898 | 1921-1924 | |
| 30 | John Drake | 3.923 | 1924-1939 | |
| 31 | Edwin van Pelt | 3.962 | 1927-1938 | |
| 32 | Diego Ramírez | 3.968 | 1961-1975 | |
| 33 | Akira Abe | 3.971 | 1911-1919 | |
| 34 | David Little | 3.973 | 1915-1919 | |
| 35 | Felipe Hernández | 3.982 | 1919-1926 | |
| 36 | Steven Bingham | 4.001 | 1922-1926 | |
| 37 | Kevin Barnett | 4.013 | 1937-1947 | |
| 37 | Donald Gilbert | 4.013 | 1911-1921 | |
| 39 | Mortimer Cold | 4.014 | 1924-1935 | |
| 40 | Ramón Pérez | 4.022 | 1929-1935 | |
| 41 | Mauro Alfaro | 4.039 | 1926-1938 | |
| 42 | Brian Strong | 4.043 | 1922-1930 | |
| 43 | Pedro Valenzuela | 4.046 | 1931-1941 | |
| 44 | Ryan Duncan | 4.053 | 1946-1960 | |
| 45 | Curt Fullerton | 4.089 | 1963-1980 | |
| 46 | Matt Meadows | 4.104 | 1935-1945 | |
| 47 | Renault Recchi | 4.138 | 1936-1947 | |
| 48 | Robert Reese | 4.150 | 1917-1922 | |
| 49 | José Santiago | 4.196 | 1938-1950 | |
| 50 | David Bennett | 4.212 | 1931-1936 | |
| 51 | Riemer Steenis | 4.225 | 1943-1949 | |
| 52 | Chris Bedford | 4.227 | 1911-1917 | |
| 53 | Kevin Pollock# | 4.247 | 1977-1990 | |
| 54 | Jason González | 4.252 | 1978-1988 | |
| 55 | Ron Stroud | 4.267 | 1928-1939 | |
| 56 | Rob Davis# | 4.302 | 1983-1991 | |
| 57 | Everett Moore | 4.312 | 1977-1987 | |
| 58 | Tomás Sánchez | 4.424 | 1936-1948 | |
| 59 | Alex McKenzie | 4.434 | 1959-1969 | |
| 60 | José Murillo | 4.465 | 1911-1915 | |
| 61 | Bart Nicholas | 4.487 | 1920-1924 | |
| 62 | Lodovico Guglielmotti | 4.491 | 1975-1981 | |
| 63 | Denzel Brown | 4.497 | 1915-1922 | |
| 64 | Mitch Payne | 4.532 | 1911-1921 | |
| 65 | Jeff Rainey# | 4.602 | 1982-1989 | |
| 66 | Trey Manning# | 4.685 | 1979-1983 | |
| 67 | Jimmy Smith | 4.709 | 1911-1920 | |
| 68 | Russ Bazin | 4.722 | 1935-1941 | |
| 69 | Jaime Montáñez | 4.752 | 1945-1953 | |
| 70 | Tim Benton | 4.753 | 1975-1987 | |
| 71 | Martín Herrera | 4.756 | 1969-1975 | |
| 72 | Robert Ellison | 4.796 | 1956-1965 | |
| 73 | Fred Haynes | 4.812 | 1911-1914 | |
| 74 | Joe Johns | 4.831 | 1914-1921 | |
| 75 | Artie Wilkins# | 4.872 | 1983-1991 | |
| 76 | Cliff Blake | 4.877 | 1911-1917 | |
| 77 | Ron Farmer | 4.890 | 1954-1962 | |
| 78 | José Ojeda | 4.897 | 1912-1921 | |
| 79 | Lucas Bergström | 4.935 | 1941-1950 | |
| 80 | António García | 5.001 | 1961-1967 | |
| 81 | Peter Franklin | 5.021 | 1976-1987 | |
| 82 | Wilbur Patterson | 5.100 | 1949-1960 | |
| 83 | Griff Faulkner | 5.175 | 1946-1952 | |
| 84 | Ronaldo Delgado# | 5.248 | 1983-1991 | |
| 85 | Joe Clément | 5.318 | 1958-1970 | |
| 86 | Joe Cannon | 5.323 | 1977-1987 | |
| 87 | Jonathon Sampson | 5.348 | 1947-1954 | |
| 88 | Glenn Mills | 5.421 | 1912-1917 | |
| 89 | Sylvester Brooks | 5.450 | 1938-1947 | |
| 90 | Alonso Martínez | 5.462 | 1976-1987 | |
| 91 | Marvin Wilson | 5.563 | 1952-1957 | |
| 92 | John Aastrom | 5.623 | 1935-1946 | |
| 93 | Sergio Rivera | 5.884 | 1911-1916 | |
| 94 | Borek Jerksak | 6.279 | 1944-1955 | |
| 95 | Kiyomitsu Sano | 6.310 | 1975-1982 | |
| 96 | Mike Keil# | 6.467 | 1978-1989 |
