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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Mordecai Brown# | 1.246 | 1908 | |
| 2 | Jack Pfiester | 1.329 | 1906 | |
| 3 | Mordecai Brown# | 1.360 | 1909 | |
| 4 | Mordecai Brown# | 1.434 | 1906 | |
| 5 | Jose Mendez# | 1.482 | 1907 | |
| 6 | Addie Joss | 1.576 | 1907 | |
| 7 | Ed Walsh# | 1.621 | 1908 | |
| 8 | Jack Chesbro | 1.636 | 1903 | |
| 9 | Howie Camnitz | 1.637 | 1910 | |
| 10 | Addie Joss | 1.645 | 1902 | |
| 11 | Cy Young | 1.730 | 1904 | |
| 12 | Addie Joss | 1.739 | 1909 | |
| 13 | Lefty Leifield# | 1.769 | 1907 | |
| 14 | Walter Johnson# | 1.789 | 1913 | |
| 15 | Jack Pfiester | 1.790 | 1909 | |
| 16 | Addie Joss | 1.805 | 1905 | |
| 17 | Kid Nichols* | 1.807 | 1905 | |
| 18 | Bob Ewing | 1.821 | 1904 | |
| 19 | Charles Bender# | 1.839 | 1909 | |
| 20 | Orval Overall | 1.846 | 1910 | |
| 21 | Harry Howell | 1.860 | 1904 | |
| 22 | Clark Griffith | 1.879 | 1898 | |
| 23 | Frank Kitson | 1.886 | 1904 | |
| 24 | Slim Sallee# | 1.896 | 1909 | |
| 25 | Ed Walsh# | 1.901 | 1910 | |
| 26 | Addie Joss | 1.904 | 1906 | |
| 27 | Fred Glade | 1.914 | 1905 | |
| 28 | Cy Young | 1.927 | 1892 | |
| 29 | Joe Williams# | 1.934 | 1909 | |
| 30 | Kid Nichols* | 1.946 | 1904 | |
| 31 | Win Kellum | 1.960 | 1904 | |
| 32 | Christy Mathewson# | 1.967 | 1909 | |
| 33 | Christy Mathewson# | 1.968 | 1908 | |
| 34 | Jack Chesbro | 1.973 | 1905 | |
| 35 | Ed Walsh# | 1.979 | 1907 | |
| 36 | Heinie Berger | 1.985 | 1908 | |
| 36 | Frank Smith | 1.985 | 1907 | |
| 38 | Vic Willis | 1.993 | 1902 | |
| 39 | Rube Manning | 1.996 | 1908 | |
| 40 | Addie Joss | 1.998 | 1904 | |
| 41 | Sam Leever | 2.006 | 1906 | |
| 42 | Barney Wolfe | 2.020 | 1904 | |
| 42 | Harry Howell | 2.020 | 1905 | |
| 44 | Charles Bender# | 2.034 | 1907 | |
| 45 | Mordecai Brown# | 2.035 | 1907 | |
| 46 | Jack Chesbro | 2.037 | 1907 | |
| 47 | Christy Mathewson# | 2.045 | 1904 | |
| 48 | Noodles Hahn | 2.048 | 1902 | |
| 49 | Bill Dinneen | 2.049 | 1902 | |
| 50 | Addie Joss | 2.064 | 1908 | |
| 51 | Walter Johnson# | 2.067 | 1907 | |
| 52 | Addie Joss | 2.069 | 1903 | |
| 53 | Red Ames# | 2.071 | 1905 | |
| 53 | Noodles Hahn | 2.071 | 1904 | |
| 55 | Tully Sparks | 2.083 | 1905 | |
| 56 | Walter Johnson# | 2.089 | 1914 | |
| 57 | Sam Leever | 2.090 | 1902 | |
| 58 | Dick Rudolph# | 2.091 | 1914 | |
| 59 | Al Maul | 2.103 | 1898 | |
| 60 | Howie Camnitz | 2.109 | 1908 | |
| 61 | Jack Pfiester | 2.115 | 1907 | |
| 62 | Heinie Berger | 2.117 | 1907 | |
| 63 | Orval Overall | 2.119 | 1907 | |
| 64 | Barney Pelty | 2.126 | 1904 | |
| 65 | Kid Nichols* | 2.134 | 1898 | |
| 66 | Jack Pfiester | 2.135 | 1908 | |
| 67 | Rube Waddell | 2.144 | 1904 | |
| 68 | Christy Mathewson# | 2.145 | 1902 | |
| 69 | Joe Williams# | 2.153 | 1907 | |
| 70 | Charles Bender# | 2.156 | 1914 | |
| 71 | Johnny Lush | 2.160 | 1906 | |
| 72 | Ed Walsh# | 2.161 | 1911 | |
| 73 | Dummy Taylor | 2.164 | 1904 | |
| 74 | Charles Bender# | 2.166 | 1908 | |
| 75 | George Winter | 2.169 | 1908 | |
| 76 | Chick Fraser | 2.171 | 1908 | |
| 77 | Elmer Steele | 2.187 | 1908 | |
| 78 | Tom Johnson# | 2.189 | 1914 | |
| 79 | Cy Young | 2.192 | 1901 | |
| 80 | Rube Waddell | 2.193 | 1908 | |
| 81 | Harry Howell | 2.194 | 1908 | |
| 82 | Claude Hendrix# | 2.196 | 1913 | |
| 83 | Rube Waddell | 2.199 | 1902 | |
| 84 | Otto Hess# | 2.205 | 1906 | |
| 84 | Hooks Wiltse | 2.205 | 1912 | |
| 86 | George Mullin | 2.214 | 1903 | |
| 87 | Christy Mathewson# | 2.215 | 1906 | |
| 88 | Charles Bender# | 2.224 | 1903 | |
| 89 | Joe Benz# | 2.227 | 1914 | |
| 90 | Kid Nichols* | 2.229 | 1890 | |
| 91 | Frank Arellanes | 2.230 | 1908 | |
| 91 | George McQuillan# | 2.230 | 1908 | |
| 93 | Glenn Liebhardt | 2.231 | 1906 | |
| 94 | Walter Johnson# | 2.233 | 1908 | |
| 95 | Jose Mendez# | 2.234 | 1908 | |
| 96 | Babe Adams# | 2.237 | 1912 | |
| 97 | Al Orth | 2.241 | 1906 | |
| 98 | Norwood Gibson | 2.245 | 1904 | |
| 99 | Gus Weyhing | 2.250 | 1888 | |
| 100 | Tully Sparks | 2.252 | 1906 |
