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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Micah Burridge | 3.533 | 1948-1949 | |
| 2 | Borek Jerksak | 4.347 | 1937-1947 | |
| 3 | Ernesto Caboverde | 4.418 | 1947-1950 | |
| 4 | Jimmy Simons | 4.853 | 1940-1942 | |
| 5 | Clement Wallace | 4.966 | 1943-1945 | |
| 6 | Jorge Valdés | 5.130 | 1934-1936 | |
| 7 | Don Lord | 5.176 | 1975-1981 | |
| 8 | Jong-beom Paek | 5.267 | 1933-1936 | |
| 9 | Brian Buck | 5.381 | 1966-1971 | |
| 10 | Jesús Rentería# | 5.396 | 1979-1984 | |
| 11 | Enrique Barrios* | 5.446 | 1941-1943 | |
| 12 | Ed Carpenter | 5.487 | 1955-1960 | |
| 13 | Alonso Zumaya | 5.725 | 1978-1985 | |
| 14 | William Piper | 5.759 | 1953-1957 | |
| 15 | Orlando Guillén | 5.884 | 1977-1985 | |
| 16 | Gustavo Mercado | 5.893 | 1960-1966 | |
| 17 | Jason Retter# | 6.143 | 1975-1990 | |
| 18 | Ryan Howe | 6.218 | 1978-1982 | |
| 19 | Javier Hernández# | 6.306 | 1983-1990 | |
| 20 | Tony Moura# | 6.530 | 1983-1988 | |
| 21 | Esteban Méndez | 6.581 | 1970-1974 | |
| 22 | Jing-xiang Woo# | 7.020 | 1982-1989 |
