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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Len Barker | 0.71 | 1946-1955 | |
| 2 | Ralph Terry | 0.88 | 1949-1952 | |
| 3 | Noah Syndergaard# | 1.02 | 1965-1969 | |
| 4 | Greg Maddux* | 1.16 | 1946-1957 | |
| 5 | Bob Sykes | 1.69 | 1950-1962 | |
| 6 | Chris C Hatcher# | 1.80 | 1959-1969 | |
| 7 | Pedro Feliciano# | 1.83 | 1964-1969 | |
| 8 | John Lackey# | 1.85 | 1960-1969 | |
| 9 | Robbie Erlin | 1.95 | 1947-1957 | |
| 10 | Jim Beattie# | 1.96 | 1962-1969 | |
| 11 | Matt Moore | 2.01 | 1946-1958 | |
| 11 | Stan Thomas# | 2.01 | 1958-1969 | |
| 13 | Clint Brown | 2.04 | 1953-1964 | |
| 14 | Brad Penny# | 2.07 | 1963-1969 | |
| 15 | Ricky Bottalico# | 2.08 | 1960-1969 | |
| 16 | Darren Holmes# | 2.11 | 1957-1969 | |
| 17 | Jimmie Keenan# | 2.19 | 1960-1969 | |
| 18 | Jim Barr# | 2.30 | 1961-1969 | |
| 19 | Matt Young# | 2.31 | 1966-1969 | |
| 20 | Dave Von Ohlen | 2.33 | 1947-1960 | |
| 21 | Ernie Broglio | 2.37 | 1964-1968 | |
| 21 | Danny Darwin | 2.37 | 1947-1962 | |
| 23 | Dizzy Dean* | 2.39 | 1946-1961 | |
| 24 | Chien-Ming Wang | 2.50 | 1948-1954 | |
| 25 | David Palmer# | 2.51 | 1955-1969 | |
| 25 | Diego Segui# | 2.51 | 1965-1969 | |
| 27 | Kyle Peterson# | 2.54 | 1962-1968 | |
| 28 | Cory Burns | 2.57 | 1953-1967 | |
| 29 | Hugh McQuillan | 2.59 | 1946-1956 | |
| 29 | Al McBean# | 2.59 | 1962-1969 | |
| 31 | Jon Lester | 2.64 | 1947-1966 | |
| 32 | Madison Bumgarner* | 2.65 | 1946-1962 | |
| 33 | Mickey Storey# | 2.66 | 1955-1969 | |
| 34 | Hiroki Kuroda | 2.68 | 1950-1958 | |
| 35 | Ed Bahr# | 2.70 | 1961-1967 | |
| 35 | Juan Pizarro | 2.70 | 1946-1963 | |
| 37 | Jack Hallett | 2.73 | 1955-1969 | |
| 38 | Kyle Gibson# | 2.75 | 1968-1969 | |
| 38 | Snipe Hansen# | 2.75 | 1962-1969 | |
| 40 | Dutch Ulrich | 2.87 | 1954-1965 | |
| 40 | Chris Leroux# | 2.87 | 1965-1969 | |
| 42 | Chuck Taylor# | 2.89 | 1966-1969 | |
| 42 | Mike Bruhert | 2.89 | 1951-1968 | |
| 44 | Mike Henneman | 2.91 | 1951-1962 | |
| 45 | Wilton Lopez | 2.92 | 1957-1969 | |
| 46 | Steve Dunning# | 2.95 | 1963-1969 | |
| 47 | Carlos Perez | 2.98 | 1953-1963 | |
| 48 | George Earnshaw | 3.00 | 1956-1962 | |
| 49 | Paxton Crawford# | 3.01 | 1961-1969 | |
| 50 | Jay Tibbs# | 3.04 | 1963-1969 | |
| 51 | Fritz Peterson# | 3.05 | 1964-1969 | |
| 52 | Doug Jones | 3.07 | 1953-1969 | |
| 53 | Danny Coombs# | 3.08 | 1964-1968 | |
| 54 | Ben Sheets# | 3.11 | 1967-1969 | |
| 55 | Bob Sebra# | 3.14 | 1959-1969 | |
| 55 | Mike Smithson# | 3.14 | 1961-1969 | |
| 57 | Kirk McCaskill# | 3.18 | 1961-1969 | |
| 58 | Freddy Garcia# | 3.19 | 1956-1969 | |
| 59 | Doug Davis# | 3.24 | 1965-1969 | |
| 60 | Jae Weong Seo# | 3.26 | 1962-1969 | |
| 61 | Roger Craig | 3.30 | 1950-1963 | |
| 61 | Jim Hickey# | 3.30 | 1957-1969 | |
| 61 | Corey Kluber | 3.30 | 1948-1961 | |
| 64 | Scott T Baker | 3.31 | 1946-1957 | |
| 64 | John D'Acquisto# | 3.31 | 1961-1969 | |
| 66 | Charlie Root | 3.33 | 1951-1967 | |
| 66 | Steve D Barber | 3.33 | 1953-1968 | |
| 68 | Livan Hernandez | 3.40 | 1946-1956 | |
| 69 | Kenta Maeda# | 3.42 | 1959-1969 | |
| 70 | Chris Short# | 3.47 | 1959-1969 | |
| 70 | Derek Lowe | 3.47 | 1950-1967 | |
| 72 | Mike Boddicker# | 3.48 | 1966-1969 | |
| 73 | Chris Sale# | 3.57 | 1955-1969 | |
| 74 | Nelson Cruz# | 3.58 | 1958-1967 | |
| 75 | Alex Fernandez | 3.62 | 1946-1956 | |
| 76 | Mace Brown# | 3.63 | 1963-1969 | |
| 77 | Dave Frost | 3.64 | 1959-1968 | |
| 78 | Frank Viola | 3.69 | 1946-1961 | |
| 79 | Bob Osborn | 3.72 | 1947-1964 | |
| 79 | Hal Gregg# | 3.72 | 1960-1969 | |
| 81 | Clay Buchholz# | 3.74 | 1959-1969 | |
| 82 | Francisco Cordova# | 3.75 | 1955-1969 | |
| 83 | Dillon Gee | 3.79 | 1950-1966 | |
| 84 | Ownie Carroll | 3.81 | 1948-1963 | |
| 85 | Jim Kaat# | 3.83 | 1954-1969 | |
| 85 | Gary Peters | 3.83 | 1946-1958 | |
| 87 | Tim Stauffer# | 3.84 | 1956-1969 | |
| 87 | Stan Coveleski | 3.84 | 1946-1959 | |
| 89 | Ralph Birkofer# | 3.86 | 1956-1969 | |
| 89 | Drew Storen | 3.86 | 1950-1966 | |
| 91 | Scott Bankhead | 3.89 | 1953-1967 | |
| 92 | Schoolboy Rowe | 3.92 | 1946-1958 | |
| 93 | Chan Ho Park | 3.93 | 1949-1966 | |
| 94 | Harry Kelley | 3.99 | 1949-1965 | |
| 95 | Mike L Griffin# | 4.03 | 1959-1969 | |
| 95 | Brett Cecil | 4.03 | 1950-1969 | |
| 97 | Lary Sorensen# | 4.05 | 1956-1969 | |
| 98 | Osiris Matos | 4.07 | 1954-1967 | |
| 99 | Don Schwall | 4.08 | 1946-1959 | |
| 100 | Tyler Anderson# | 4.11 | 1962-1969 |
