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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Mario Guerra | 2.387 | 1995-2005 | |
| 2 | Herbert Gibbs | 2.490 | 1957-1962 | |
| 3 | António Cruz | 2.552 | 1987-1991 | |
| 4 | Bernaldyn Lavado | 2.564 | 1967-1976 | |
| 5 | Aurelio Galindo | 2.585 | 1972-1976 | |
| 6 | Pancho Villalobos | 2.645 | 1995-2003 | |
| 7 | José Burra | 2.714 | 1964-1973 | |
| 8 | Mario Rojas | 2.754 | 1966-1970 | |
| 9 | Kevin Cummins | 2.775 | 1964-1968 | |
| 10 | Thomas Lamm | 2.812 | 1961-1966 | |
| 11 | Jonathan Collins | 2.939 | 1969-1977 | |
| 12 | Gilberto Flores | 2.943 | 1992-2001 | |
| 13 | Ricardo Velásquez | 2.998 | 1971-1985 | |
| 14 | Steve Johnson# | 3.027 | 2009-2014 | |
| 15 | Charles Walker | 3.041 | 1970-1980 | |
| 16 | Félix Cruz | 3.056 | 1963-1972 | |
| 17 | Joe McCay | 3.141 | 1957-1965 | |
| 18 | Carlos Padilla | 3.222 | 2000-2014 | |
| 19 | Floyd Petersen | 3.259 | 1994-2000 | |
| 20 | Roberto González# | 3.270 | 2009-2014 | |
| 21 | Garry Robinson | 3.375 | 1970-1974 | |
| 22 | Jason Griffith | 3.377 | 1967-1977 | |
| 23 | Tomas Solis | 3.430 | 1958-1967 | |
| 24 | Michael Berry | 3.449 | 1969-1981 | |
| 25 | Andrew Hong | 3.793 | 1958-1964 | |
| 26 | Robert Peterson | 3.898 | 1957-1960 | |
| 27 | Craig Brown | 3.918 | 1969-1976 | |
| 28 | Lyman Palmatier | 4.053 | 1963-1968 | |
| 29 | Luis Reynoso | 4.942 | 1965-1969 |
