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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Richard Mahlmann | 2.106 | 1981-1986 | |
| 2 | Bobby Tiefenauer | 2.321 | 1951-1965 | |
| 3 | Gary Perritt# | 2.501 | 1976-1979 | |
| 4 | Bob Sykes# | 2.588 | 1974-1979 | |
| 5 | Bob Babcock | 2.832 | 1972-1978 | |
| 6 | Paul Pelz | 2.834 | 1972-1976 | |
| 7 | Nick Strincevich | 2.911 | 1942-1950 | |
| 8 | Doc Medich | 2.913 | 1974-1981 | |
| 9 | Oscar Brito | 2.918 | 1978-1983 | |
| 10 | Frank Colman | 2.921 | 1941-1953 | |
| 11 | Ken Crosby | 2.930 | 1972-1975 | |
| 12 | Dale Harrington | 2.947 | 1972-1981 | |
| 13 | Timothy Juran | 2.982 | 1971-1976 | |
| 14 | Jack Crimian | 3.065 | 1952-1959 | |
| 15 | Bill Short | 3.075 | 1959-1967 | |
| 16 | Pat Scantlebury | 3.081 | 1954-1961 | |
| 17 | Ron Romanick# | 3.086 | 1981-1986 | |
| 18 | Jim Shellenback | 3.103 | 1965-1974 | |
| 19 | Andrew Castillo | 3.105 | 1976-1983 | |
| 20 | Wally Bunker | 3.115 | 1968-1976 | |
| 20 | Dave Freisleben | 3.115 | 1971-1978 | |
| 22 | John Gelnar | 3.132 | 1964-1968 | |
| 23 | Tony Jacobs | 3.158 | 1950-1957 | |
| 24 | Zach Monroe | 3.160 | 1959-1961 | |
| 25 | Philip Johnson# | 3.189 | 1980-1985 | |
| 25 | Phil Nastu | 3.189 | 1977-1982 | |
| 27 | Alex Mustaikis | 3.194 | 1944-1948 | |
| 28 | Bill Gilbreth | 3.195 | 1970-1978 | |
| 29 | Ed Whitson# | 3.215 | 1977-1983 | |
| 30 | Donnell Goodwin | 3.220 | 1970-1978 | |
| 31 | Jeff Reardon# | 3.233 | 1978-1982 | |
| 32 | Ron Negray | 3.236 | 1959-1963 | |
| 33 | Ernie McAnally | 3.237 | 1970-1982 | |
| 34 | Mike Cuellar | 3.255 | 1957-1961 | |
| 35 | Jerry Ujdur | 3.283 | 1981-1986 | |
| 36 | Thomas Boyd# | 3.305 | 1970-1987 | |
| 37 | Marty Hulse | 3.334 | 1975-1983 | |
| 38 | Jim Bronstad | 3.340 | 1958-1964 | |
| 39 | Ken Holcombe | 3.342 | 1942-1953 | |
| 40 | Paul Mitchell | 3.350 | 1972-1977 | |
| 41 | Mike Krukow | 3.378 | 1975-1982 | |
| 41 | Orlando Pena | 3.378 | 1957-1971 | |
| 43 | Julio Navarro | 3.400 | 1964-1971 | |
| 44 | Ken Lehman | 3.403 | 1953-1962 | |
| 45 | Tom Lasorda | 3.450 | 1950-1960 | |
| 45 | Ron Schueler | 3.450 | 1968-1975 | |
| 47 | Floyd Giebell | 3.451 | 1940-1946 | |
| 48 | Jim A Wilson | 3.471 | 1943-1949 | |
| 49 | Toru Hamaura | 3.474 | 1974-1979 | |
| 50 | Jackie Collum | 3.476 | 1949-1961 | |
| 51 | Dave Stieb | 3.486 | 1983-1987 | |
| 52 | Bill Kirkpatrick | 3.490 | 1970-1975 | |
| 53 | Jack Cullen | 3.493 | 1962-1970 | |
| 54 | Bob Keegan | 3.495 | 1947-1960 | |
| 55 | Gary Wheelock | 3.507 | 1975-1978 | |
| 56 | Rudy Minarcin | 3.514 | 1951-1959 | |
| 57 | Jay Smith | 3.519 | 1974-1982 | |
| 58 | Glenn Cox | 3.534 | 1951-1959 | |
| 59 | Larry Maxie | 3.537 | 1961-1971 | |
| 60 | Fred Kipp | 3.547 | 1956-1962 | |
| 61 | Don R Johnson | 3.555 | 1944-1959 | |
| 62 | Johnny Hetki | 3.559 | 1948-1956 | |
| 63 | Jose Sevillano | 3.568 | 1972-1974 | |
| 64 | Craig Skok | 3.575 | 1971-1978 | |
| 65 | Gene Garber | 3.580 | 1968-1972 | |
| 66 | Moose Haas# | 3.598 | 1975-1982 | |
| 67 | Tommie Sheppard | 3.604 | 1974-1979 | |
| 68 | Raul Sanchez | 3.608 | 1954-1961 | |
| 69 | Duke Markell | 3.624 | 1952-1957 | |
| 70 | Darryl Banks# | 3.625 | 1981-1985 | |
| 71 | Dixie Howell | 3.628 | 1943-1949 | |
| 72 | Rene Valdes | 3.635 | 1957-1960 | |
| 73 | Gary Blaylock | 3.651 | 1954-1962 | |
| 74 | Ed Hobaugh | 3.664 | 1962-1969 | |
| 75 | Dick Ricketts | 3.665 | 1957-1964 | |
| 76 | Lynn Lovenguth | 3.673 | 1950-1959 | |
| 77 | Jim Konstanty | 3.675 | 1942-1955 | |
| 78 | Ernie Martinez | 3.680 | 1975-1979 | |
| 78 | John Whitehead | 3.680 | 1940-1945 | |
| 80 | Kelly Downs# | 3.730 | 1980-1985 | |
| 81 | Dick Lines | 3.733 | 1959-1969 | |
| 82 | Ed Rakow | 3.734 | 1959-1968 | |
| 83 | Bob Reed | 3.738 | 1967-1976 | |
| 84 | Fred Hahn | 3.741 | 1951-1959 | |
| 85 | Bob W Smith | 3.749 | 1952-1963 | |
| 85 | Jack Faszholz | 3.749 | 1950-1956 | |
| 87 | Alex Gonzales | 3.754 | 1977-1986 | |
| 88 | Bill T Harris | 3.761 | 1954-1960 | |
| 89 | Cal Browning | 3.801 | 1957-1963 | |
| 90 | Paul Thormodsgard | 3.802 | 1973-1976 | |
| 91 | Bill Voiselle | 3.805 | 1943-1956 | |
| 92 | Babe Birrer | 3.809 | 1952-1966 | |
| 93 | Cot Deal | 3.811 | 1946-1959 | |
| 94 | Eric Rasmussen | 3.815 | 1972-1975 | |
| 95 | Don Rose | 3.869 | 1970-1975 | |
| 96 | Don Thompson | 3.885 | 1945-1954 | |
| 97 | Steve Ridzik | 3.893 | 1948-1963 | |
| 98 | Bob Alexander | 3.922 | 1949-1953 | |
| 99 | Vicente Amor | 3.924 | 1955-1959 | |
| 99 | Harry Kimberlin | 3.924 | 1940-1947 |
