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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Paul Campbell | 2.228 | 1966-1968 | |
| 2 | Alex Mustaikis | 2.300 | 1940-1943 | |
| 3 | Thomas Arruda | 2.303 | 1963-1968 | |
| 4 | Chet Covington | 2.447 | 1942-1944 | |
| 5 | Henry Holmes | 2.680 | 1974-1980 | |
| 6 | Ralph McCabe | 2.838 | 1943-1945 | |
| 7 | Mickey McDermott | 2.955 | 1945-1948 | |
| 8 | Francis Panick | 2.974 | 1975-1977 | |
| 9 | Bob Heffner | 3.034 | 1959-1962 | |
| 10 | Orie Arntzen | 3.035 | 1941-1950 | |
| 11 | Jack Jenkins | 3.044 | 1963-1966 | |
| 12 | George Diehl | 3.096 | 1940-1942 | |
| 13 | Xavier Rescigno | 3.147 | 1940-1951 | |
| 14 | Reggie Grabowski | 3.155 | 1940-1942 | |
| 15 | Ben Cardoni | 3.156 | 1943-1954 | |
| 16 | Steven Samuelson | 3.203 | 1977-1980 | |
| 17 | Billy MacLeod | 3.218 | 1963-1967 | |
| 18 | Roger Slagle# | 3.241 | 1976-1978 | |
| 19 | Ray Peters | 3.291 | 1970-1972 | |
| 20 | Ken Clay | 3.297 | 1975-1979 | |
| 21 | Jim Rittwage | 3.395 | 1964-1969 | |
| 22 | Akira Kawahara | 3.409 | 1975-1978 | |
| 23 | Gary James | 3.414 | 1976-1980 | |
| 24 | Ken Wright | 3.440 | 1966-1969 | |
| 25 | Don Grate | 3.445 | 1945-1950 | |
| 26 | Eli Hodkey | 3.455 | 1942-1947 | |
| 27 | Archie Dawson | 3.495 | 1966-1971 | |
| 28 | Gregory Wilkes# | 3.510 | 1978-1981 | |
| 29 | Tony Perry | 3.519 | 1974-1978 | |
| 30 | Louis Whetstone# | 3.543 | 1978-1981 | |
| 31 | Dave Downs | 3.561 | 1973-1980 | |
| 32 | Michael Heintz | 3.563 | 1970-1975 | |
| 33 | Leo Williams | 3.675 | 1971-1977 | |
| 34 | Art Doll | 3.703 | 1940-1943 | |
| 35 | Robert May | 3.713 | 1972-1980 | |
| 36 | Fred Anyzeski | 3.739 | 1974-1977 | |
| 37 | Dave Wallace | 3.759 | 1970-1975 | |
| 38 | Tim Murphy | 3.798 | 1973-1977 | |
| 39 | Mike Willis | 3.826 | 1971-1975 | |
| 40 | Guido Grilli | 3.840 | 1960-1963 | |
| 41 | Dennis Yard | 3.890 | 1970-1977 | |
| 42 | Bob Lacey | 3.897 | 1974-1977 | |
| 43 | Dave Moore | 3.950 | 1973-1977 | |
| 44 | Wayne Bradley | 4.002 | 1977-1980 | |
| 45 | Ken Reynolds | 4.051 | 1969-1972 | |
| 46 | Dick Pole | 4.161 | 1970-1974 | |
| 47 | Ken Poulsen | 4.287 | 1967-1968 | |
| 48 | Michael Whitson | 4.301 | 1970-1972 | |
| 49 | Bill S Rodgers | 4.306 | 1944-1951 | |
| 50 | Brad Gratz | 4.311 | 1972-1979 | |
| 51 | Gerald Lanning | 4.468 | 1970-1973 | |
| 52 | Craig Scramuzzo | 4.533 | 1970-1975 | |
| 53 | Steven McNulty | 4.577 | 1976-1978 | |
| 54 | Jim McKee | 4.613 | 1970-1971 | |
| 55 | Edward Szado | 4.642 | 1973-1976 | |
| 56 | Jordan Salaiz | 4.699 | 1975-1980 | |
| 57 | Jimmy Blackmon | 4.850 | 1970-1973 |
