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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Babe Ruth | 0.871 | 1914-1937 | |
| 2 | Sherry Smith | 0.890 | 1911-1927 | |
| 3 | Willie Foster | 0.900 | 1931-1939 | |
| 4 | Christy Mathewson* | 0.974 | 1900-1916 | |
| 5 | Satchel Paige# | 1.029 | 1933-1940 | |
| 6 | Eddie Plank* | 1.317 | 1901-1917 | |
| 7 | Lady Baldwin | 1.500 | 1884-1890 | |
| 8 | Orval Overall | 1.578 | 1905-1913 | |
| 9 | Bob Shawkey | 1.673 | 1913-1928 | |
| 10 | Jesse Haines | 1.815 | 1918-1936 | |
| 11 | Ernie Shore | 1.817 | 1912-1920 | |
| 12 | George Mullin | 1.862 | 1902-1915 | |
| 13 | Lefty Tyler | 1.909 | 1910-1924 | |
| 14 | Mort Cooper# | 1.944 | 1938-1941 | |
| 15 | Bill Dinneen | 2.057 | 1898-1909 | |
| 16 | Jimmy Ring | 2.077 | 1917-1930 | |
| 17 | Silver King | 2.182 | 1886-1897 | |
| 18 | Eddie Cicotte* | 2.216 | 1905-1920 | |
| 19 | Jack Quinn | 2.328 | 1909-1928 | |
| 20 | Cy Young* | 2.361 | 1890-1911 | |
| 21 | Chief Bender* | 2.435 | 1903-1917 | |
| 22 | Pretzels Getzien | 2.483 | 1884-1892 | |
| 23 | Bob Caruthers | 2.510 | 1884-1892 | |
| 24 | Stan Coveleski | 2.512 | 1912-1927 | |
| 25 | Lefty Grove# | 2.568 | 1925-1941 | |
| 26 | Dave Foutz | 2.640 | 1884-1896 | |
| 27 | Tim Keefe | 2.656 | 1880-1893 | |
| 28 | John Clarkson | 2.672 | 1882-1894 | |
| 29 | Jack Coombs | 2.700 | 1906-1920 | |
| 29 | Deacon Phillippe | 2.700 | 1899-1911 | |
| 31 | Bill Lohrman# | 2.805 | 1935-1941 | |
| 32 | Jim McCormick | 2.864 | 1878-1887 | |
| 33 | Bill Donovan | 2.880 | 1898-1918 | |
| 34 | Mordecai Brown* | 2.965 | 1903-1916 | |
| 35 | Pete Conway | 3.000 | 1885-1889 | |
| 36 | Ed Reulbach | 3.031 | 1905-1917 | |
| 37 | Rube Marquard* | 3.068 | 1908-1924 | |
| 38 | Carl Hubbell# | 3.149 | 1928-1941 | |
| 39 | Ed Crane | 3.273 | 1884-1893 | |
| 40 | Rube Walberg | 3.290 | 1923-1936 | |
| 41 | Bill Hallahan | 3.447 | 1926-1938 | |
| 42 | Ted Lyons# | 3.558 | 1923-1941 | |
| 43 | Jeff Tesreau | 3.619 | 1912-1918 | |
| 44 | Red Faber* | 3.689 | 1914-1931 | |
| 45 | Dutch Leonard | 3.767 | 1913-1927 | |
| 46 | Eppa Rixey* | 3.900 | 1912-1935 | |
| 47 | Jack Pfiester | 3.971 | 1903-1911 | |
| 48 | Waite Hoyt | 4.019 | 1918-1940 | |
| 49 | Bobo Newsom# | 4.071 | 1929-1941 | |
| 50 | Sad Sam Jones | 4.183 | 1914-1936 | |
| 51 | George Earnshaw | 4.349 | 1928-1937 | |
| 52 | Art Nehf | 4.469 | 1915-1930 | |
| 53 | Tom Lovett | 4.500 | 1885-1894 | |
| 54 | Bill Walker# | 4.722 | 1927-1938 | |
| 55 | Paul Derringer# | 4.826 | 1931-1941 | |
| 56 | Roy Parmelee# | 4.832 | 1930-1940 | |
| 57 | Dizzy Dean# | 5.000 | 1930-1941 | |
| 58 | Adonis Terry | 5.081 | 1884-1897 | |
| 59 | Ice Box Chamberlin | 5.318 | 1886-1896 | |
| 60 | Ted Trent | 5.674 | 1937-1939 | |
| 61 | Burleigh Grimes | 5.870 | 1916-1932 | |
| 62 | Hal Schumacher# | 6.861 | 1931-1941 |
