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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Bill Mitchell | 2.794 | 1974-1980 | |
| 2 | Robert Vélez# | 3.353 | 1980-1988 | |
| 3 | Luke Studs | 3.726 | 1943-1947 | |
| 4 | Quentin Tofts | 3.824 | 1937-1943 | |
| 5 | Jay Mills | 3.853 | 1921-1927 | |
| 6 | Ronald Connolly# | 3.916 | 1979-1989 | |
| 7 | Flaherty Mure | 4.046 | 1960-1969 | |
| 8 | Gael Whiteway | 4.139 | 1973-1983 | |
| 9 | Naozane Kitakawa | 4.222 | 1934-1938 | |
| 10 | Robbie Kidwell | 4.448 | 1943-1950 | |
| 11 | Tommy Richardson | 4.537 | 1976-1981 | |
| 11 | Elton Thompson# | 4.537 | 1977-1989 | |
| 13 | Dylan Wheelton | 4.541 | 1943-1950 | |
| 14 | Alfonso Gómez# | 4.790 | 1975-1981 | |
| 15 | Aaron MacAlonie# | 4.955 | 1980-1986 | |
| 16 | Andrés López | 5.094 | 1927-1934 | |
| 17 | Callum Simpson | 5.115 | 1972-1977 | |
| 18 | Jaime Gonzáles | 5.230 | 1933-1938 | |
| 19 | Serge Boutet | 5.249 | 1928-1933 | |
| 20 | Rich Morán# | 5.265 | 1979-1990 | |
| 21 | Samuel Bullman | 5.272 | 1926-1934 | |
| 22 | Cody Albrecht | 5.354 | 1937-1940 | |
| 23 | Haroun Akil# | 5.360 | 1981-1989 | |
| 24 | Pearce Ebbets | 5.731 | 1976-1986 | |
| 25 | Wally Todd | 5.754 | 1925-1928 | |
| 26 | Roldăo Canha | 5.909 | 1934-1937 | |
| 27 | Lee Codd | 5.930 | 1972-1976 | |
| 28 | Slobodan Zoric# | 6.492 | 1975-1980 |
