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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Sam George | 2.791 | 1922-1925 | |
| 2 | Kent Wilson | 3.211 | 1926-1929 | |
| 3 | Mario Valenzuela | 3.290 | 1926-1928 | |
| 4 | Killian McKieson | 3.544 | 1936-1941 | |
| 5 | Jesús Béltre | 3.720 | 1916-1920 | |
| 6 | Christopher Perrin | 3.787 | 1936-1941 | |
| 7 | Phil Stout | 3.791 | 1938-1941 | |
| 8 | Doug Blackwell | 3.888 | 1962-1975 | |
| 9 | Pat Chandler | 4.009 | 1940-1950 | |
| 10 | Ryuichi Honda | 4.026 | 1959-1963 | |
| 11 | Ken Coker | 4.074 | 1930-1938 | |
| 12 | Patrick Brown | 4.199 | 1925-1928 | |
| 13 | Daniel Harriman | 4.246 | 1936-1941 | |
| 14 | Jesús Rivero | 4.279 | 1958-1971 | |
| 15 | Yannick Goor | 4.357 | 1942-1945 | |
| 16 | Bryan Humble | 4.403 | 1921-1928 | |
| 17 | Tony Díaz | 4.483 | 1911-1920 | |
| 18 | José Fuentes | 4.543 | 1975-1980 | |
| 19 | Manuel Pujols | 4.567 | 1944-1950 | |
| 20 | António Pérez | 4.619 | 1920-1923 | |
| 21 | John Flowers | 4.728 | 1915-1918 | |
| 22 | Andre Robinson | 4.741 | 1971-1984 | |
| 23 | Tony Barrios | 4.782 | 1945-1949 | |
| 24 | Wayne Glendenning | 4.935 | 1976-1980 | |
| 25 | Jorge Pińa | 4.967 | 1978-1981 | |
| 26 | Cipriano Castro | 5.008 | 1977-1986 | |
| 27 | Wilbur Patterson | 5.013 | 1948-1959 | |
| 28 | Francisco Cruz | 5.072 | 1962-1970 | |
| 29 | Cody Johnston | 5.112 | 1965-1970 | |
| 30 | Tony Segura | 5.162 | 1958-1963 | |
| 31 | Juan Sánchez | 5.234 | 1957-1961 | |
| 32 | Ryan Verrall | 5.239 | 1920-1924 | |
| 33 | António García | 5.294 | 1958-1971 | |
| 34 | Andy Thornton | 5.299 | 1960-1965 | |
| 35 | Brad Ramírez | 5.411 | 1968-1976 | |
| 36 | Jason Garrett# | 5.433 | 1985-1990 | |
| 37 | James Lapthorne | 5.492 | 1975-1990 | |
| 38 | Jiro Watanabe | 5.600 | 1975-1985 | |
| 39 | José Trujillo | 5.664 | 1928-1932 | |
| 40 | Esteban Toromoreno# | 5.840 | 1978-1989 | |
| 41 | Salvador Muńóz | 5.883 | 1937-1940 | |
| 42 | Fernando Morales | 5.910 | 1945-1958 | |
| 43 | Itri Olu | 5.989 | 1981-1990 | |
| 44 | Toby Pugsley | 6.327 | 1948-1963 | |
| 45 | Toby Kelley | 6.516 | 1949-1954 | |
| 46 | Jesús Vega | 6.977 | 1953-1957 |
