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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Bob Chesnes | 1.520 | 1946 | |
| 2 | Larry Jansen | 1.570 | 1946 | |
| 3 | Clem Dreisewerd | 1.607 | 1944 | |
| 4 | Spec Shea | 1.655 | 1946 | |
| 5 | Morrie Martin | 1.679 | 1957 | |
| 6 | Al Brazle | 1.688 | 1943 | |
| 7 | Red Munger | 1.787 | 1955 | |
| 8 | Timothy Jones# | 1.847 | 1978 | |
| 9 | Red Adams | 1.857 | 1955 | |
| 10 | Tommy Boggs# | 1.951 | 1981 | |
| 11 | Red Witt | 1.997 | 1957 | |
| 12 | Gary Ryerson | 2.074 | 1974 | |
| 13 | Lou Kretlow | 2.089 | 1955 | |
| 14 | Bill Kelso | 2.092 | 1966 | |
| 15 | Con Dempsey | 2.096 | 1948 | |
| 16 | Red Munger | 2.097 | 1954 | |
| 17 | Larry Loughlin | 2.118 | 1965 | |
| 18 | Ken Raffensberger | 2.139 | 1943 | |
| 19 | Manny Salvo | 2.143 | 1944 | |
| 20 | Bob Joyce | 2.172 | 1945 | |
| 21 | Red Adams | 2.175 | 1952 | |
| 22 | Larry Jansen | 2.187 | 1940 | |
| 23 | Bill Hands# | 2.193 | 1965 | |
| 24 | Elmer Singleton | 2.205 | 1955 | |
| 25 | Joe Moeller | 2.211 | 1968 | |
| 25 | Ron Reed | 2.211 | 1979 | |
| 27 | Bob O'Brien | 2.214 | 1971 | |
| 28 | Leo Kiely | 2.219 | 1957 | |
| 29 | Bobby Locke | 2.224 | 1967 | |
| 30 | Bob Mabe | 2.234 | 1959 | |
| 31 | Dewey Adkins | 2.250 | 1948 | |
| 32 | Bill Werle | 2.263 | 1946 | |
| 33 | Burt Hooton | 2.267 | 1970 | |
| 34 | Al Dawson# | 2.276 | 1979 | |
| 35 | Vern Ruhle | 2.280 | 1973 | |
| 36 | Jim Colborn | 2.281 | 1969 | |
| 37 | Jim Coates | 2.282 | 1968 | |
| 38 | Jack Salveson | 2.297 | 1940 | |
| 39 | Wilbur Wood# | 2.303 | 1964 | |
| 40 | Al Widmar | 2.305 | 1952 | |
| 41 | Rick Reuschel# | 2.310 | 1970 | |
| 42 | Bobby Locke | 2.314 | 1965 | |
| 43 | Bob Chesnes | 2.318 | 1947 | |
| 44 | Archie Reynolds | 2.319 | 1969 | |
| 44 | Elmer Singleton | 2.319 | 1956 | |
| 46 | Dock Ellis | 2.329 | 1978 | |
| 46 | Joe Orrell | 2.329 | 1943 | |
| 48 | Bob Muncrief | 2.352 | 1953 | |
| 49 | Rich P Robertson | 2.355 | 1968 | |
| 50 | Floyd Bannister# | 2.359 | 1978 | |
| 51 | Bert Raschke | 2.362 | 1974 | |
| 51 | Tom Seats | 2.362 | 1944 | |
| 53 | Lino Donoso | 2.371 | 1954 | |
| 54 | Jim B Johnson | 2.379 | 1974 | |
| 55 | Jim Brosnan | 2.381 | 1955 | |
| 56 | Tom Kelley | 2.384 | 1965 | |
| 57 | Bob Meyer | 2.386 | 1967 | |
| 58 | Nub Kleinke | 2.400 | 1940 | |
| 59 | Rich Rodas# | 2.403 | 1981 | |
| 60 | Stephen Hudson | 2.410 | 1977 | |
| 61 | Mel J Queen | 2.415 | 1952 | |
| 62 | Roger Bowman | 2.418 | 1954 | |
| 63 | Don Rudolph | 2.422 | 1960 | |
| 64 | Paul Gehrman | 2.429 | 1943 | |
| 65 | Bob Joyce | 2.432 | 1943 | |
| 66 | Sammy Stewart# | 2.437 | 1978 | |
| 67 | Jim M Lewis# | 2.441 | 1978 | |
| 68 | Benjamin Ochoa# | 2.444 | 1972 | |
| 68 | Jim Davis | 2.444 | 1951 | |
| 70 | George Bamberger | 2.446 | 1958 | |
| 71 | Marino Pieretti | 2.460 | 1944 | |
| 72 | Ray Fontenot# | 2.463 | 1981 | |
| 73 | Red Lynn | 2.468 | 1943 | |
| 74 | Tom Seats | 2.476 | 1943 | |
| 75 | Gaylord Perry | 2.481 | 1962 | |
| 76 | Jack Salveson | 2.483 | 1946 | |
| 77 | Jim Coates | 2.485 | 1966 | |
| 78 | Douglas Nelson# | 2.486 | 1978 | |
| 79 | Bud Byerly | 2.488 | 1943 | |
| 80 | Willie Ramsdell | 2.502 | 1949 | |
| 81 | Tim Costello# | 2.506 | 1979 | |
| 82 | Bob Alexander | 2.512 | 1955 | |
| 83 | Erv Palica | 2.517 | 1960 | |
| 84 | Johnny Lindell | 2.521 | 1952 | |
| 85 | Theodore Gilje | 2.531 | 1971 | |
| 86 | Dan Greenhalgh# | 2.543 | 1980 | |
| 87 | Ken Gables | 2.546 | 1952 | |
| 87 | Jim McGlothlin | 2.546 | 1965 | |
| 89 | George Perez | 2.547 | 1959 | |
| 89 | Erv Palica | 2.547 | 1957 | |
| 91 | Gaylord Perry | 2.548 | 1961 | |
| 92 | Dennis Bennett | 2.553 | 1968 | |
| 93 | Roberto Rodriguez | 2.554 | 1966 | |
| 94 | Mel Held | 2.557 | 1957 | |
| 95 | Paul Gehrman | 2.571 | 1942 | |
| 95 | Floyd Stromme | 2.571 | 1944 | |
| 97 | Gary Christophel# | 2.579 | 1975 | |
| 98 | Roberto Rodriguez | 2.580 | 1967 | |
| 99 | Jack Salveson | 2.584 | 1942 | |
| 100 | Italo Chelini | 2.585 | 1942 |
