Baseball – Leading Season ERA Record Holders
| Rank | Player | ERA | Year |
| 1 | Tim Keefe | 0.8571 | 1880 |
| 2 | Dutch Leonard | 0.9614 | 1914 |
| 3 | Mordecai Brown | 1.0385 | 1906 |
| 4 | Bob Gibson | 1.1225 | 1968 |
| 5 | Christy Mathewson | 1.1441 | 1909 |
| 6 | Walter Johnson | 1.1445 | 1913 |
| 7 | Jack Pfiester | 1.1538 | 1907 |
| 8 | Addie Joss | 1.1631 | 1908 |
| 9 | Carl Lundgren | 1.1739 | 1907 |
| 10 | Denny Driscoll | 1.2090 | 1882 |
| 11 | Pete Alexander | 1.2197 | 1915 |
| 12 | George Bradley | 1.2251 | 1876 |
| 13 | Cy Young | 1.2642 | 1908 |
| 14 | Ed Walsh | 1.2660 | 1910 |
| 15 | Walter Johnson | 1.2699 | 1918 |
| 16 | Christy Mathewson | 1.2756 | 1905 |
| 17 | Guy Hecker | 1.2981 | 1882 |
| 18 | Jack Coombs | 1.3003 | 1910 |
| 19 | Mordecai Brown | 1.3132 | 1909 |
| 20 | Jack Taylor | 1.3306 | 1902 |
| 21 | Walter Johnson | 1.3622 | 1910 |
| 22 | George Bradley | 1.3776 | 1880 |
| 23 | Charley Radbourn | 1.3792 | 1884 |
| 24 | Walter Johnson | 1.3902 | 1912 |
| 25 | Mordecai Brown | 1.3906 | 1907 |
| 26 | Harry Krause | 1.3944 | 1909 |
| 27 | Ed Walsh | 1.4067 | 1909 |
| 28 | Ed Walsh | 1.4160 | 1908 |
| 29 | Ed Reulbach | 1.4194 | 1905 |
| 30 | Orval Overall | 1.4210 | 1909 |
| 31 | Christy Mathewson | 1.4283 | 1908 |
| 32 | Fred Anderson | 1.4444 | 1917 |
| 33 | Mordecai Brown | 1.4696 | 1908 |
| 34 | Rube Waddell | 1.4787 | 1905 |
| 35 | Joe Wood | 1.4873 | 1915 |
| 36 | Walter Johnson | 1.4879 | 1919 |
| 37 | Jack Pfiester | 1.5080 | 1906 |
| 38 | John Ward | 1.5090 | 1878 |
| 39 | Harry McCormick | 1.5159 | 1882 |
| 40 | Doc White | 1.5182 | 1906 |
| 41 | George McQuillan | 1.5264 | 1908 |
| 42 | Dwight Gooden | 1.5289 | 1985 |
| 43 | Eddie Cicotte | 1.5317 | 1917 |
| 44 | Will White | 1.5375 | 1882 |
| 45 | Cy Morgan | 1.5482 | 1910 |
| 46 | Pete Alexander | 1.5501 | 1916 |
| 47 | Walter Johnson | 1.5505 | 1915 |
| 48 | Howie Camnitz | 1.5592 | 1908 |
| 49 | Greg Maddux | 1.5594 | 1994 |
| 50 | Jim Devlin | 1.5627 | 1876 |
Updated: November 4, 2009
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