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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Floyd Wooldridge | 2.299 | 1952-1955 | |
| 2 | Willie Ramsdell | 2.446 | 1946-1954 | |
| 3 | Ted Wilks | 2.514 | 1940-1956 | |
| 4 | Hal Erickson | 2.534 | 1951-1952 | |
| 5 | Les Mueller | 2.554 | 1940-1942 | |
| 6 | Gordon Maltzberger | 2.613 | 1941-1942 | |
| 7 | Dave Hoskins | 2.618 | 1952-1958 | |
| 8 | Ralph Hamner | 2.659 | 1941-1953 | |
| 9 | Joe Landrum | 2.714 | 1949-1955 | |
| 10 | Prince Oana | 2.750 | 1940-1947 | |
| 11 | Red Murff | 2.763 | 1953-1955 | |
| 12 | Ed Chandler | 2.801 | 1946-1949 | |
| 13 | Fred Martin | 2.858 | 1941-1958 | |
| 14 | Hank Wyse | 2.947 | 1948-1952 | |
| 15 | Walt Lanfranconi | 2.979 | 1949-1952 | |
| 16 | Clarence Beers | 3.013 | 1940-1953 | |
| 17 | Al Papai | 3.028 | 1947-1958 | |
| 18 | Bob Mabe | 3.044 | 1955-1956 | |
| 19 | Doyle Lade | 3.078 | 1941-1954 | |
| 20 | Gary Marks | 3.085 | 1973-1975 | |
| 21 | Billy Muffett | 3.107 | 1951-1957 | |
| 22 | Herb Hippauf | 3.112 | 1962-1965 | |
| 23 | Al LaMacchia | 3.121 | 1942-1950 | |
| 24 | Gary Sarno# | 3.148 | 1978-1981 | |
| 25 | Chris Van Cuyk | 3.152 | 1948-1950 | |
| 26 | Michael Elwood | 3.158 | 1973-1977 | |
| 27 | Jose G Santiago | 3.161 | 1952-1959 | |
| 28 | Charlie Fuchs | 3.165 | 1940-1942 | |
| 29 | Floyd Speer | 3.184 | 1941-1950 | |
| 30 | Ryne Duren | 3.194 | 1952-1955 | |
| 31 | Toru Hamaura# | 3.212 | 1972-1979 | |
| 32 | Jack Creel | 3.218 | 1942-1953 | |
| 33 | Bob Uhl | 3.220 | 1940-1946 | |
| 34 | Hugo Klaerner | 3.224 | 1940-1942 | |
| 35 | Sterling Slaughter | 3.226 | 1963-1967 | |
| 36 | Don Arlich | 3.252 | 1964-1967 | |
| 37 | Ted Wieand | 3.268 | 1955-1962 | |
| 38 | John Andre | 3.271 | 1953-1955 | |
| 39 | Len Gilmore | 3.290 | 1946-1949 | |
| 40 | Otho Nitcholas | 3.294 | 1940-1949 | |
| 41 | Andrew Castillo# | 3.318 | 1973-1978 | |
| 42 | Michael Van De Casteele | 3.344 | 1972-1978 | |
| 43 | George Whileyman | 3.356 | 1977-1978 | |
| 44 | Robert Mayhew | 3.359 | 1977-1979 | |
| 45 | Dan Spillner | 3.396 | 1972-1978 | |
| 46 | Bruce Ellingsen | 3.406 | 1970-1973 | |
| 47 | Jim Willis | 3.466 | 1950-1957 | |
| 48 | Tom McGough# | 3.472 | 1974-1980 | |
| 49 | Danny Arizola# | 3.487 | 1979-1981 | |
| 50 | Robert Ware | 3.492 | 1975-1976 | |
| 51 | Tom King | 3.495 | 1971-1977 | |
| 52 | Thomas King | 3.532 | 1970-1977 | |
| 53 | Ben Menard | 3.537 | 1971-1975 | |
| 54 | Al Schroll | 3.546 | 1956-1957 | |
| 55 | Larry Marshall | 3.547 | 1974-1978 | |
| 56 | Cal Dorsett | 3.567 | 1946-1949 | |
| 57 | Keith Atherton# | 3.568 | 1979-1981 | |
| 58 | Fred Baczewski | 3.573 | 1948-1958 | |
| 59 | Robert Ulrich | 3.585 | 1975-1976 | |
| 60 | Ed Nunez# | 3.593 | 1978-1981 | |
| 61 | Roric Harrison | 3.595 | 1968-1974 | |
| 62 | Mike Chris | 3.604 | 1976-1980 | |
| 63 | Len Barker | 3.619 | 1973-1974 | |
| 64 | Scott Marchael | 3.634 | 1972-1976 | |
| 65 | Tommy Fine | 3.639 | 1949-1956 | |
| 66 | Wayne McLeland | 3.652 | 1949-1955 | |
| 67 | Joe Blake | 3.655 | 1971-1976 | |
| 68 | Mike Clark | 3.667 | 1951-1958 | |
| 69 | Robert Box# | 3.675 | 1976-1980 | |
| 70 | Robert Mestek | 3.687 | 1973-1974 | |
| 71 | Brian Bach | 3.715 | 1970-1972 | |
| 72 | Bobby Herrera | 3.734 | 1947-1954 | |
| 73 | Edward Sempsrott | 3.764 | 1978-1980 | |
| 74 | Paul Doyle | 3.779 | 1962-1968 | |
| 75 | David Nelson | 3.788 | 1973-1978 | |
| 76 | Jamie Easterly | 3.812 | 1970-1976 | |
| 76 | Al Wihtol | 3.812 | 1970-1977 | |
| 78 | Roy J Thomas# | 3.825 | 1971-1981 | |
| 79 | Jim Flynn | 3.831 | 1970-1973 | |
| 79 | George Gerberman | 3.831 | 1963-1968 | |
| 81 | Jeff Pryor | 3.833 | 1970-1973 | |
| 81 | Sid Monge | 3.833 | 1971-1973 | |
| 83 | Joe Henderson | 3.841 | 0-0 | |
| 84 | Charlie Williams | 3.855 | 1969-1975 | |
| 85 | Bill Greason | 3.859 | 1952-1956 | |
| 86 | Morrie Steevens | 3.870 | 1961-1965 | |
| 87 | Michael Henderson | 3.902 | 1972-1978 | |
| 88 | Gil Maldonado# | 3.920 | 1979-1981 | |
| 89 | Dean Burk | 3.940 | 1967-1971 | |
| 90 | Edward Orick# | 3.946 | 1978-1981 | |
| 91 | Larry Landreth | 3.969 | 1973-1978 | |
| 92 | Chris Knapp | 3.973 | 1975-1980 | |
| 93 | Bill Tremel | 3.998 | 1951-1958 | |
| 94 | Greg Terlecky | 4.000 | 1973-1975 | |
| 95 | Hooks Iott | 4.043 | 1941-1955 | |
| 96 | Ron Schueler# | 4.064 | 1968-1971 | |
| 97 | Guy Todd | 4.071 | 1974-1979 | |
| 98 | Terry Felton# | 4.073 | 1976-1981 | |
| 99 | Harold Jeffcoat | 4.108 | 1968-1971 | |
| 100 | Chuck Locke | 4.119 | 1954-1957 |
