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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Addie Joss* | 1.960 | 1902-1910 | |
| 2 | Jack Pfiester | 2.254 | 1904-1911 | |
| 3 | Ed Walsh* | 2.287 | 1904-1914 | |
| 4 | Babe Ruth* | 2.413 | 1914-1935 | |
| 5 | Fred Glade | 2.440 | 1903-1907 | |
| 6 | Christy Mathewson* | 2.497 | 1900-1916 | |
| 7 | Glenn Liebhardt | 2.503 | 1906-1909 | |
| 8 | Orval Overall | 2.523 | 1905-1913 | |
| 9 | Jake Weimer | 2.543 | 1903-1909 | |
| 10 | Barney Wolfe | 2.582 | 1903-1906 | |
| 11 | Noodles Hahn | 2.601 | 1899-1906 | |
| 12 | Frank Arellanes | 2.627 | 1908-1910 | |
| 13 | Heinie Berger | 2.637 | 1907-1910 | |
| 14 | George Winter | 2.654 | 1901-1908 | |
| 15 | Sam Leever | 2.665 | 1898-1909 | |
| 16 | Mordecai Brown* | 2.671 | 1903-1916 | |
| 16 | Jimmy Dygert | 2.671 | 1905-1910 | |
| 18 | George McQuillan | 2.681 | 1907-1917 | |
| 19 | Rube Waddell* | 2.686 | 1897-1910 | |
| 20 | Rube Vickers | 2.688 | 1902-1909 | |
| 21 | Fred Toney | 2.691 | 1914-1923 | |
| 22 | Jack Chesbro | 2.692 | 1899-1909 | |
| 23 | Tom Hughes | 2.693 | 1906-1917 | |
| 24 | Hod Eller | 2.702 | 1917-1920 | |
| 25 | Spud Chandler | 2.704 | 1937-1952 | |
| 26 | Jeff Tesreau | 2.721 | 1912-1918 | |
| 27 | Hooks Wiltse | 2.728 | 1904-1914 | |
| 28 | Babe Adams* | 2.735 | 1906-1926 | |
| 29 | Ed Killian | 2.739 | 1903-1910 | |
| 30 | Charles Bender* | 2.740 | 1903-1924 | |
| 31 | Bugs Raymond | 2.742 | 1904-1910 | |
| 31 | Charlie Smith | 2.742 | 1903-1914 | |
| 33 | Harry Howell | 2.755 | 1898-1909 | |
| 34 | Pol Perritt | 2.757 | 1912-1921 | |
| 35 | Bill James | 2.783 | 1913-1919 | |
| 36 | Jack Coombs | 2.786 | 1906-1916 | |
| 37 | Cy Young* | 2.787 | 1890-1911 | |
| 38 | Johnny Lush | 2.798 | 1904-1910 | |
| 39 | Fred Anderson | 2.812 | 1909-1918 | |
| 40 | Erskine Mayer | 2.813 | 1913-1919 | |
| 41 | Bob Ewing | 2.815 | 1902-1910 | |
| 42 | Dick Rudolph | 2.816 | 1912-1926 | |
| 43 | Reb Russell | 2.819 | 1913-1923 | |
| 44 | Claude Hendrix | 2.823 | 1911-1920 | |
| 45 | Ed Karger | 2.838 | 1906-1911 | |
| 46 | Harry Coveleski | 2.840 | 1907-1917 | |
| 47 | Howie Camnitz | 2.846 | 1904-1913 | |
| 47 | Red Ames* | 2.846 | 1903-1919 | |
| 49 | Walter Johnson* | 2.856 | 1907-1927 | |
| 50 | Ed Reulbach | 2.865 | 1905-1916 | |
| 51 | Slim Sallee | 2.867 | 1908-1921 | |
| 52 | Kid Nichols* | 2.885 | 1890-1906 | |
| 53 | Mickey Haefner | 2.887 | 1943-1948 | |
| 54 | Frank Smith | 2.891 | 1904-1911 | |
| 55 | Deacon Phillippe | 2.906 | 1899-1911 | |
| 56 | Wilbur Cooper | 2.910 | 1912-1926 | |
| 57 | Tully Sparks | 2.916 | 1897-1909 | |
| 57 | Hank Robinson | 2.916 | 1911-1918 | |
| 57 | Russ Ford | 2.916 | 1909-1913 | |
| 60 | George McConnell | 2.919 | 1912-1916 | |
| 61 | Lefty Leifield | 2.930 | 1905-1920 | |
| 62 | Jesse Tannehill | 2.938 | 1894-1910 | |
| 63 | Hippo Vaughn | 2.957 | 1909-1921 | |
| 64 | Harry Krause | 2.959 | 1908-1911 | |
| 64 | Bill Dinneen | 2.959 | 1898-1909 | |
| 66 | Rube Manning | 2.962 | 1907-1910 | |
| 67 | Johnny Taylor | 2.975 | 1907-1915 | |
| 68 | Ferdie Schupp | 2.976 | 1916-1922 | |
| 69 | Doc White | 2.978 | 1901-1912 | |
| 70 | Joe McGinnity | 2.985 | 1899-1908 | |
| 71 | Slow Joe Doyle | 2.986 | 1906-1909 | |
| 72 | Cy Morgan | 2.991 | 1904-1912 | |
| 73 | Nick Altrock | 3.012 | 1898-1929 | |
| 74 | Frank Miller | 3.014 | 1915-1923 | |
| 75 | John Donaldson | 3.016 | 1913-1921 | |
| 76 | Tiny Bonham | 3.032 | 1940-1950 | |
| 77 | Hank Borowy | 3.038 | 1942-1948 | |
| 78 | Amos Rusie | 3.041 | 1889-1901 | |
| 79 | Ed Siever | 3.051 | 1901-1908 | |
| 80 | Joe Wood | 3.053 | 1908-1922 | |
| 81 | Barney Pelty | 3.054 | 1903-1912 | |
| 82 | Jack Powell | 3.067 | 1897-1912 | |
| 83 | Eddie Plank* | 3.074 | 1901-1917 | |
| 84 | Ned Garvin | 3.077 | 1896-1904 | |
| 85 | Art Fromme | 3.083 | 1906-1914 | |
| 86 | George Mullin | 3.092 | 1902-1913 | |
| 87 | Frank Kitson | 3.093 | 1898-1907 | |
| 88 | Jose Mendez* | 3.098 | 1907-1926 | |
| 89 | Jay Hughes | 3.100 | 1898-1902 | |
| 90 | Ray Collins | 3.106 | 1909-1915 | |
| 91 | Otto Hess | 3.114 | 1902-1914 | |
| 92 | Jim Scott | 3.120 | 1909-1917 | |
| 93 | Joe Williams* | 3.124 | 1907-1930 | |
| 94 | Irv Young | 3.135 | 1905-1911 | |
| 94 | Joe Benz | 3.135 | 1911-1918 | |
| 96 | Lefty Williams | 3.149 | 1915-1923 | |
| 97 | Bill Donovan | 3.150 | 1898-1918 | |
| 98 | Frank Owen | 3.155 | 1901-1909 | |
| 99 | Bill Bernhard | 3.156 | 1899-1907 | |
| 100 | Bill Doak | 3.188 | 1913-1929 |
