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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Addie Joss* | 0.750 | 1902-1910 | |
| 2 | Orval Overall | 1.588 | 1905-1913 | |
| 3 | Babe Adams* | 1.731 | 1906-1926 | |
| 4 | Jumbo Brown | 1.742 | 1926-1952 | |
| 5 | Tiny Bonham | 2.000 | 1940-1950 | |
| 6 | Jesse Tannehill | 2.109 | 1894-1910 | |
| 7 | Joe Wood | 2.139 | 1908-1922 | |
| 8 | Satchel Paige | 2.231 | 1927-1951 | |
| 9 | Max Lanier | 2.378 | 1938-1951 | |
| 10 | Spud Chandler | 2.380 | 1937-1952 | |
| 11 | Rube Waddell* | 2.388 | 1897-1910 | |
| 12 | Gentry Jessup# | 2.480 | 1940-1954 | |
| 13 | Hal Schumacher | 2.537 | 1931-1947 | |
| 14 | Charley Root | 2.613 | 1923-1940 | |
| 15 | Hank Borowy | 2.647 | 1942-1948 | |
| 16 | Herb Pennock | 2.673 | 1912-1934 | |
| 17 | Christy Mathewson* | 2.689 | 1900-1916 | |
| 18 | Wilbur Cooper | 2.700 | 1912-1926 | |
| 19 | Bill Bernhard | 2.883 | 1899-1907 | |
| 20 | Babe Ruth* | 2.928 | 1914-1935 | |
| 21 | Bill Doak | 2.950 | 1913-1929 | |
| 22 | Jeff Tesreau | 3.000 | 1912-1918 | |
| 23 | Deacon Phillippe | 3.031 | 1899-1911 | |
| 24 | Jesse Haines | 3.040 | 1919-1938 | |
| 25 | Cy Young* | 3.041 | 1890-1911 | |
| 26 | Fred Toney | 3.094 | 1914-1923 | |
| 27 | Bill Hallahan | 3.176 | 1926-1941 | |
| 28 | Mordecai Brown* | 3.222 | 1903-1916 | |
| 29 | Eddie Plank* | 3.250 | 1901-1917 | |
| 30 | Barney Morris | 3.280 | 1932-1947 | |
| 31 | Van Mungo# | 3.331 | 1931-1954 | |
| 32 | Ed Brandt | 3.350 | 1928-1950 | |
| 33 | Dutch Leonard | 3.355 | 1913-1925 | |
| 34 | Jack Quinn | 3.361 | 1909-1932 | |
| 35 | Paul Derringer | 3.400 | 1931-1952 | |
| 36 | Mort Cooper | 3.531 | 1938-1947 | |
| 37 | Charles Bender* | 3.542 | 1903-1924 | |
| 38 | Curt Simmons# | 3.838 | 1948-1954 | |
| 39 | Carl Hubbell* | 3.844 | 1928-1948 | |
| 40 | Red Ames* | 4.091 | 1903-1919 | |
| 41 | Johnny Allen | 4.109 | 1932-1942 | |
| 42 | Jack Pfiester | 4.211 | 1904-1911 | |
| 43 | Waite Hoyt | 4.263 | 1919-1944 | |
| 44 | Walter Johnson* | 4.583 | 1907-1927 | |
| 45 | Sam Streeter | 4.783 | 1921-1936 | |
| 46 | Jakie May | 4.832 | 1918-1932 | |
| 47 | Lefty Gomez | 5.062 | 1930-1942 | |
| 48 | Otto Hess | 5.283 | 1902-1914 | |
| 49 | Lefty Grove* | 5.457 | 1925-1945 | |
| 50 | Hod Eller | 5.940 | 1917-1920 | |
| 51 | Allie Reynolds# | 6.016 | 1942-1954 | |
| 52 | Rube Marquard | 6.097 | 1908-1925 | |
| 53 | Tom Zachary | 6.188 | 1920-1936 | |
| 54 | Al Hollingsworth | 6.580 | 1935-1947 | |
| 55 | Vean Gregg | 6.993 | 1911-1925 | |
| 56 | Dave Brown | 7.121 | 1919-1925 |
