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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Darren Holmes# | 2.29 | 1957-1969 | |
| 2 | Jimmie Keenan# | 2.34 | 1960-1969 | |
| 3 | John D'Acquisto# | 2.39 | 1961-1969 | |
| 4 | Noah Syndergaard# | 2.47 | 1965-1969 | |
| 5 | Fritz Peterson# | 2.55 | 1964-1969 | |
| 6 | Al McBean# | 2.63 | 1962-1969 | |
| 7 | Brad Penny# | 2.67 | 1963-1969 | |
| 8 | James Paxton# | 2.76 | 1957-1969 | |
| 9 | Cory Burns | 2.80 | 1953-1967 | |
| 10 | Derek Lowe | 2.84 | 1950-1967 | |
| 11 | Jim Hickey# | 2.86 | 1957-1969 | |
| 12 | Mickey Storey# | 2.88 | 1955-1969 | |
| 12 | Paxton Crawford# | 2.88 | 1961-1969 | |
| 14 | Bob Sebra# | 2.95 | 1959-1969 | |
| 15 | John Lackey# | 2.96 | 1960-1969 | |
| 16 | Dizzy Dean* | 3.01 | 1946-1961 | |
| 17 | Al Shealy# | 3.07 | 1962-1969 | |
| 18 | Madison Bumgarner* | 3.15 | 1946-1962 | |
| 19 | Mace Brown# | 3.16 | 1963-1969 | |
| 20 | Francisco Cordova# | 3.18 | 1955-1969 | |
| 21 | Chris Sale# | 3.21 | 1955-1969 | |
| 21 | Snipe Hansen# | 3.21 | 1962-1969 | |
| 23 | Greg Maddux* | 3.30 | 1946-1957 | |
| 24 | Mark Mulder | 3.37 | 1950-1961 | |
| 24 | Cam Bedrosian# | 3.37 | 1953-1969 | |
| 24 | Kirk McCaskill# | 3.37 | 1961-1969 | |
| 27 | Clay Buchholz# | 3.39 | 1959-1969 | |
| 28 | Gary Peters | 3.42 | 1946-1958 | |
| 28 | Mike Bruhert | 3.42 | 1951-1968 | |
| 30 | Osiris Matos | 3.43 | 1954-1967 | |
| 30 | Jim Beattie# | 3.43 | 1962-1969 | |
| 30 | Jameson Taillon | 3.43 | 1950-1958 | |
| 30 | Bob Sykes | 3.43 | 1950-1962 | |
| 34 | Sam Militello | 3.44 | 1956-1967 | |
| 35 | Bob Friend | 3.46 | 1946-1957 | |
| 36 | Jae Weong Seo# | 3.48 | 1962-1969 | |
| 36 | Jack Hallett | 3.48 | 1955-1969 | |
| 38 | Lary Sorensen# | 3.50 | 1956-1969 | |
| 39 | Charlie Root | 3.51 | 1951-1967 | |
| 40 | Scott T Baker | 3.53 | 1946-1957 | |
| 41 | Jaret Wright# | 3.54 | 1961-1969 | |
| 42 | Hal Gregg# | 3.56 | 1960-1969 | |
| 42 | Freddy Garcia# | 3.56 | 1956-1969 | |
| 44 | Kenta Maeda# | 3.57 | 1959-1969 | |
| 45 | Jon Lester | 3.61 | 1947-1966 | |
| 46 | Pat Malone | 3.62 | 1948-1960 | |
| 47 | Shawn Estes# | 3.65 | 1959-1969 | |
| 48 | Lefty Williams | 3.66 | 1946-1959 | |
| 49 | Tim Stauffer# | 3.67 | 1956-1969 | |
| 50 | Diego Segui# | 3.69 | 1965-1969 | |
| 51 | Randy D Johnson | 3.70 | 1946-1951 | |
| 51 | Kent Peterson# | 3.70 | 1956-1969 | |
| 53 | Scott Bankhead | 3.73 | 1953-1967 | |
| 54 | Carlos Perez | 3.74 | 1953-1963 | |
| 54 | Matt Moore | 3.74 | 1946-1958 | |
| 56 | Danny Darwin | 3.75 | 1947-1962 | |
| 56 | Livan Hernandez | 3.75 | 1946-1956 | |
| 58 | Kevin Slowey | 3.76 | 1952-1961 | |
| 59 | Jeremy Bonderman | 3.77 | 1958-1967 | |
| 59 | Steve D Barber | 3.77 | 1953-1968 | |
| 59 | John Thomson | 3.77 | 1946-1957 | |
| 62 | David Palmer# | 3.78 | 1955-1969 | |
| 62 | George Murray | 3.78 | 1952-1961 | |
| 64 | Kevin Tapani# | 3.79 | 1961-1969 | |
| 65 | Corey Kluber | 3.80 | 1948-1961 | |
| 65 | Tyler Anderson# | 3.80 | 1962-1969 | |
| 67 | Tom Glavine | 3.81 | 1946-1952 | |
| 68 | Eric Wilkins | 3.82 | 1954-1964 | |
| 69 | Mark Gubicza | 3.84 | 1947-1960 | |
| 70 | Dick Pole# | 3.85 | 1957-1969 | |
| 71 | Brett Cecil | 3.86 | 1950-1969 | |
| 72 | Mort Cooper | 3.87 | 1946-1958 | |
| 73 | John Mitchell# | 3.89 | 1962-1969 | |
| 74 | Erasmo E Ramirez | 3.91 | 1946-1956 | |
| 75 | Matt Clement | 3.93 | 1946-1959 | |
| 75 | Ralph Birkofer# | 3.93 | 1956-1969 | |
| 75 | Reggie Cleveland | 3.93 | 1948-1966 | |
| 78 | Glendon Rusch# | 3.94 | 1961-1969 | |
| 79 | Jim Barr# | 3.95 | 1961-1969 | |
| 80 | Toby Borland | 3.97 | 1955-1969 | |
| 81 | Jim Kaat# | 3.98 | 1954-1969 | |
| 82 | Jason Marquis | 3.99 | 1952-1968 | |
| 83 | Ed Lynch | 4.00 | 1948-1962 | |
| 84 | Schoolboy Rowe | 4.02 | 1946-1958 | |
| 85 | R A Dickey | 4.03 | 1946-1953 | |
| 86 | Ty Taubenheim# | 4.07 | 1952-1967 | |
| 86 | Robbie Erlin | 4.07 | 1947-1957 | |
| 88 | Jeff C D'Amico | 4.10 | 1946-1956 | |
| 88 | Bob Osborn | 4.10 | 1947-1964 | |
| 90 | Dick Bosman# | 4.11 | 1956-1964 | |
| 90 | Stan Coveleski | 4.11 | 1946-1959 | |
| 92 | Dutch Ulrich | 4.13 | 1954-1965 | |
| 93 | Dillon Gee | 4.14 | 1950-1966 | |
| 94 | Hideo Nomo | 4.15 | 1948-1961 | |
| 94 | Hiroki Kuroda | 4.15 | 1950-1958 | |
| 94 | Dave Frost | 4.15 | 1959-1968 | |
| 97 | Bill Monbouquette | 4.16 | 1946-1956 | |
| 97 | Frank Viola | 4.16 | 1946-1961 | |
| 97 | Dick Donovan# | 4.16 | 1959-1969 | |
| 100 | Aaron Harang# | 4.17 | 1957-1969 |
