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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Randy Jones# | 1.416 | 1974 | |
| 2 | Mel Stottlemyre Sr# | 1.421 | 1964 | |
| 3 | Jimmy Freeman | 1.559 | 1977 | |
| 4 | Dale Harrington# | 1.588 | 1974 | |
| 5 | Mark Thurmond# | 1.606 | 1981 | |
| 6 | Bob Babcock | 1.636 | 1978 | |
| 7 | Jesus Rios# | 1.699 | 1977 | |
| 8 | Al Cicotte | 1.791 | 1960 | |
| 9 | Ken Crosby | 1.856 | 1974 | |
| 10 | Don Robinson# | 1.879 | 1978 | |
| 11 | Bobby Tiefenauer | 1.892 | 1958 | |
| 12 | Pat Scantlebury | 1.898 | 1955 | |
| 13 | Benjamin Ochoa# | 1.960 | 1974 | |
| 14 | Dick Conger | 1.962 | 1943 | |
| 15 | Howie Nunn | 1.988 | 1960 | |
| 15 | Bobby Coombs | 1.988 | 1942 | |
| 17 | Monk Dubiel | 2.016 | 1943 | |
| 18 | Ewell Blackwell | 2.022 | 1942 | |
| 19 | Bill Champion | 2.034 | 1968 | |
| 20 | Red Barrett | 2.049 | 1942 | |
| 21 | Johnny Lindell | 2.053 | 1941 | |
| 22 | Bill Stafford | 2.063 | 1960 | |
| 23 | Timothy Juran | 2.064 | 1971 | |
| 24 | Dick Kelley | 2.077 | 1966 | |
| 25 | Jason Wiard | 2.095 | 1976 | |
| 26 | Jack Crimian | 2.100 | 1955 | |
| 27 | Willie Smith | 2.110 | 1963 | |
| 28 | James Alexander | 2.124 | 1976 | |
| 29 | Don Robinson# | 2.125 | 1981 | |
| 30 | Paul Pelz | 2.133 | 1973 | |
| 31 | Bobby Tiefenauer | 2.143 | 1963 | |
| 32 | Clem Dreisewerd | 2.149 | 1947 | |
| 33 | Bruce Berenyi# | 2.152 | 1981 | |
| 33 | Gerry Schoen | 2.152 | 1972 | |
| 33 | Gary Perritt# | 2.152 | 1978 | |
| 36 | Tom Poholsky | 2.165 | 1950 | |
| 37 | Dooley Womack | 2.172 | 1965 | |
| 38 | Bob Porterfield | 2.174 | 1948 | |
| 39 | Tom Brennan# | 2.184 | 1978 | |
| 40 | Ron Klimkowski | 2.185 | 1969 | |
| 41 | Galen Cisco | 2.206 | 1968 | |
| 42 | Ira Hutchinson | 2.208 | 1943 | |
| 43 | Richard Mahlmann# | 2.217 | 1981 | |
| 44 | Ben Flowers | 2.237 | 1955 | |
| 45 | Lefty Sunkel | 2.250 | 1943 | |
| 46 | Marion Fricano | 2.262 | 1952 | |
| 47 | Randy Lerch# | 2.275 | 1975 | |
| 48 | Bill Gilbreth | 2.283 | 1977 | |
| 49 | Ray Peters | 2.287 | 1979 | |
| 50 | Ed Roebuck | 2.291 | 1952 | |
| 51 | Mal Mallette | 2.298 | 1951 | |
| 52 | Moose Haas# | 2.304 | 1977 | |
| 53 | Bennie Daniels | 2.306 | 1958 | |
| 54 | Norm Brown | 2.329 | 1943 | |
| 55 | Wally Bunker | 2.333 | 1974 | |
| 55 | Al Jackson | 2.333 | 1959 | |
| 57 | Ray Washburn | 2.337 | 1961 | |
| 58 | Bob Sykes# | 2.339 | 1977 | |
| 59 | Roy Henshaw | 2.343 | 1941 | |
| 60 | Jim Umbricht | 2.345 | 1961 | |
| 61 | Bubba Church | 2.346 | 1949 | |
| 62 | Rich Wortham# | 2.350 | 1977 | |
| 63 | Arnold Carter | 2.351 | 1943 | |
| 64 | Babe Birrer | 2.362 | 1958 | |
| 65 | Jim Clancy# | 2.376 | 1977 | |
| 66 | Ed Whitson# | 2.384 | 1978 | |
| 67 | Nick Strincevich | 2.397 | 1942 | |
| 68 | Blake Green# | 2.401 | 1973 | |
| 69 | Blix Donnelly | 2.403 | 1943 | |
| 70 | Rich Hinton | 2.406 | 1975 | |
| 70 | Herb Karpel | 2.406 | 1946 | |
| 72 | Woody Crowson | 2.407 | 1944 | |
| 73 | Wilbur Wood# | 2.411 | 1966 | |
| 74 | Freddy Schmidt | 2.418 | 1943 | |
| 75 | Billy Muffett | 2.421 | 1963 | |
| 75 | Jack Hamilton | 2.421 | 1965 | |
| 77 | Al Widmar | 2.432 | 1946 | |
| 78 | Hal White | 2.434 | 1940 | |
| 79 | Mike Cuellar | 2.439 | 1957 | |
| 80 | Fred Hutchinson | 2.440 | 1941 | |
| 81 | Doc Medich# | 2.441 | 1976 | |
| 82 | Lou Lucier | 2.447 | 1942 | |
| 83 | Gary Pickert# | 2.448 | 1980 | |
| 84 | Mike Corkins | 2.450 | 1974 | |
| 85 | Mike Scott# | 2.466 | 1977 | |
| 86 | Nick Strincevich | 2.472 | 1943 | |
| 87 | Jeff Barker | 2.474 | 1976 | |
| 87 | Mel Deutsch | 2.474 | 1944 | |
| 89 | Bill Short | 2.478 | 1959 | |
| 89 | Thomas Boyd# | 2.478 | 1974 | |
| 89 | Georges Maranda | 2.478 | 1959 | |
| 92 | Charles Swanson | 2.493 | 1972 | |
| 93 | Bobby Coombs | 2.503 | 1943 | |
| 94 | Tom Lasorda | 2.504 | 1958 | |
| 95 | Bobo Holloman | 2.508 | 1952 | |
| 96 | William McLaurine | 2.509 | 1976 | |
| 97 | Zach Monroe | 2.512 | 1959 | |
| 98 | Jake Wade | 2.513 | 1947 | |
| 99 | Ron Reed | 2.514 | 1967 | |
| 100 | Lynn Lovenguth | 2.518 | 1955 |
