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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Bill White | 3.422 | 1939-1941 | |
| 2 | Loflinger Arrau | 3.762 | 1934-1939 | |
| 3 | Rafael Ortíz | 3.838 | 1911-1918 | |
| 4 | Kevin Engler | 3.957 | 1912-1916 | |
| 5 | Paco Serrano | 4.014 | 1921-1925 | |
| 6 | Kent Marriott | 4.067 | 1940-1945 | |
| 7 | Duane Stewart | 4.071 | 1974-1982 | |
| 8 | John McGill | 4.076 | 1972-1978 | |
| 9 | António López | 4.153 | 1932-1935 | |
| 10 | Bob Brandon | 4.337 | 1917-1922 | |
| 11 | Jimmy Lamb | 4.343 | 1940-1948 | |
| 12 | Alan Rivers | 4.434 | 1941-1945 | |
| 13 | Tommy Davis | 4.463 | 1967-1974 | |
| 14 | Bobby Meyers | 4.498 | 1936-1941 | |
| 15 | Tim Spence | 4.518 | 1946-1949 | |
| 16 | Brad Lew | 4.567 | 1935-1941 | |
| 17 | Alexander DeYoung | 4.611 | 1936-1943 | |
| 18 | Jack Ashley | 4.640 | 1963-1971 | |
| 19 | Darren Cargeeg | 4.655 | 1936-1940 | |
| 20 | José Nájera | 4.668 | 1927-1938 | |
| 21 | Héctor Valdéz | 4.689 | 1932-1940 | |
| 22 | Tony Price | 4.766 | 1921-1924 | |
| 23 | César Valle# | 4.825 | 1977-1991 | |
| 24 | Orlando García | 4.832 | 1938-1948 | |
| 25 | Luis Guillén | 4.854 | 1975-1980 | |
| 26 | Roberto Luna# | 4.876 | 1982-1991 | |
| 27 | Barney Sherman | 4.953 | 1958-1965 | |
| 28 | Octávio Luna | 5.155 | 1981-1989 | |
| 29 | Kirby Walters | 5.267 | 1932-1937 | |
| 30 | Cliff Spronk | 5.321 | 1958-1961 | |
| 31 | Plácido Gutiérrez | 5.324 | 1955-1961 | |
| 32 | Lambert Schreiner | 5.367 | 1980-1990 | |
| 33 | Jasper Willis | 5.631 | 1948-1952 | |
| 34 | Javier Balderas | 5.661 | 1961-1974 | |
| 35 | Jimmy Parker | 5.675 | 1979-1985 | |
| 36 | Ernesto Caboverde | 5.950 | 1952-1955 | |
| 37 | Jerome Broadley | 6.131 | 1946-1955 | |
| 38 | Leonardo Zamora | 6.379 | 1949-1953 | |
| 39 | Jorge Martínez | 6.561 | 1953-1957 |
