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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Tom Hausman# | 2.558 | 1976-1981 | |
| 2 | Ted Wilks | 2.642 | 1942-1955 | |
| 3 | Mauricio Valdivia# | 2.679 | 1979-1981 | |
| 4 | Victor Rose# | 2.684 | 1972-1974 | |
| 5 | Harry Brecheen | 2.755 | 1940-1942 | |
| 6 | Hank Wyse | 2.843 | 1940-1951 | |
| 7 | Pat Jones# | 2.868 | 1974-1981 | |
| 8 | Frank Barnes | 2.923 | 1955-1959 | |
| 9 | Mel Wright | 2.931 | 1953-1961 | |
| 10 | Stu Miller | 2.947 | 1952-1968 | |
| 11 | Warren Hacker | 2.975 | 1962-1966 | |
| 11 | Preacher Roe | 2.975 | 1941-1943 | |
| 13 | Vern Geishert | 3.072 | 1970-1974 | |
| 14 | Richard Mahlmann# | 3.094 | 1972-1974 | |
| 15 | Ramon Beltran# | 3.121 | 1975-1979 | |
| 16 | Victor Sanchez# | 3.139 | 1974-1975 | |
| 17 | Butch Wensloff | 3.141 | 1940-1942 | |
| 18 | Don Lee | 3.145 | 1957-1966 | |
| 19 | Larry Christenson# | 3.164 | 1973-1979 | |
| 20 | Jim Sanders | 3.180 | 1975-1980 | |
| 21 | Mack Stewart | 3.186 | 1946-1948 | |
| 22 | Jim Blackburn | 3.189 | 1949-1952 | |
| 23 | Al Worthington | 3.195 | 1953-1962 | |
| 24 | Tom Borland | 3.237 | 1958-1963 | |
| 25 | Robert Mestek | 3.294 | 1975-1980 | |
| 26 | Otho Nitcholas | 3.305 | 1943-1947 | |
| 27 | Murry Dickson | 3.314 | 1940-1941 | |
| 28 | Frank Barrett | 3.319 | 1940-1948 | |
| 29 | Jim Golden | 3.334 | 1958-1964 | |
| 30 | Chuck Taylor | 3.370 | 1963-1969 | |
| 31 | Wally Post | 3.395 | 1950-1953 | |
| 32 | Alex Vasquez# | 3.412 | 1976-1980 | |
| 33 | Bob Logan | 3.422 | 1940-1946 | |
| 34 | Frank Pastore# | 3.436 | 1975-1981 | |
| 35 | Joaquin Andujar# | 3.447 | 1975-1977 | |
| 36 | Will McEnaney | 3.460 | 1973-1976 | |
| 37 | Howie Reed | 3.463 | 1960-1968 | |
| 38 | Mark Lemongello# | 3.464 | 1973-1976 | |
| 39 | Tommy Warren | 3.466 | 1946-1948 | |
| 40 | Doug Bird# | 3.479 | 1970-1971 | |
| 41 | Barney Schultz | 3.484 | 1951-1966 | |
| 42 | Tom Hilgendorf | 3.490 | 1963-1970 | |
| 43 | Hal Gilson | 3.511 | 1965-1968 | |
| 44 | Tom Deidel# | 3.532 | 1972-1974 | |
| 45 | Al Dopfel# | 3.537 | 1974-1977 | |
| 46 | Bob Wiesler | 3.544 | 1951-1961 | |
| 47 | Tommy Reis | 3.545 | 1940-1953 | |
| 48 | Paul Splittorff | 3.548 | 1969-1974 | |
| 49 | Johnny Hutchings | 3.567 | 1942-1951 | |
| 50 | Jim Koering | 3.568 | 1970-1977 | |
| 51 | LaDon Boyd | 3.579 | 1970-1973 | |
| 52 | Don Hendrickson | 3.588 | 1940-1947 | |
| 53 | Charlie Leibrandt# | 3.591 | 1978-1981 | |
| 54 | Pat Zachry | 3.595 | 1971-1980 | |
| 55 | Harvey Haddix | 3.603 | 1948-1950 | |
| 56 | Charley Stanceu | 3.616 | 1940-1949 | |
| 57 | Ken Burkhart | 3.625 | 1942-1944 | |
| 58 | Owen Scheetz | 3.628 | 1942-1943 | |
| 59 | Cloyd Boyer | 3.631 | 1951-1961 | |
| 60 | Al Lary | 3.635 | 1956-1961 | |
| 61 | Henry Moore | 3.637 | 1974-1976 | |
| 62 | Johnny Gray | 3.647 | 1952-1960 | |
| 63 | Jack Spring | 3.650 | 1958-1961 | |
| 64 | Carl Willey | 3.651 | 1955-1958 | |
| 65 | Wayne Twitchell# | 3.674 | 1966-1975 | |
| 66 | Bob Knepper# | 3.677 | 1972-1979 | |
| 67 | Gordie Richardson | 3.678 | 1960-1963 | |
| 68 | Dick LeMay | 3.693 | 1966-1968 | |
| 69 | Al Widmar | 3.694 | 1955-1958 | |
| 70 | Harry Perkowski | 3.695 | 1948-1960 | |
| 71 | Glen Tackitt# | 3.697 | 1976-1981 | |
| 72 | Donald Gentry | 3.698 | 1972-1976 | |
| 73 | Chris Zachary | 3.714 | 1965-1969 | |
| 74 | Nelson Chittum | 3.717 | 1958-1962 | |
| 75 | Joe Nunn | 3.719 | 1972-1975 | |
| 76 | Adrian Zabala | 3.729 | 1950-1953 | |
| 77 | Rick Sawyer | 3.731 | 1970-1971 | |
| 78 | Jim L McDonald | 3.734 | 1955-1960 | |
| 79 | Jack Hallett | 3.743 | 1940-1949 | |
| 80 | George Spencer | 3.747 | 1953-1960 | |
| 81 | Monty Montgomery | 3.757 | 1970-1972 | |
| 82 | Don Durham | 3.761 | 1973-1976 | |
| 83 | Morrie Martin | 3.770 | 1942-1960 | |
| 84 | Don Rudolph | 3.804 | 1957-1961 | |
| 85 | Ben F Johnson | 3.810 | 1954-1964 | |
| 86 | Tom Parsons | 3.823 | 1964-1968 | |
| 87 | Dick Tidrow | 3.824 | 1970-1975 | |
| 88 | Ed Bahr | 3.834 | 1945-1950 | |
| 88 | Aurelio Monteagudo | 3.834 | 1966-1969 | |
| 90 | Andrew Muhlstock# | 3.842 | 1975-1981 | |
| 91 | Jay Avrea | 3.855 | 1948-1951 | |
| 92 | Ron Negray | 3.856 | 1952-1958 | |
| 93 | Don Bessent | 3.859 | 1953-1960 | |
| 94 | John Gabler | 3.864 | 1957-1959 | |
| 95 | Hector Artiles | 3.876 | 1971-1976 | |
| 96 | Bud Byerly | 3.883 | 1948-1959 | |
| 97 | Mike Paxton# | 3.884 | 1975-1980 | |
| 98 | Pete Hamm# | 3.900 | 1970-1973 | |
| 99 | Steve Patterson | 3.905 | 1971-1977 | |
| 100 | Trevor Faugno# | 3.927 | 1974-1980 |
