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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Edgar Kirkpatrick | 1.098 | 1880 | |
| 2 | Frank Dransfield# | 1.162 | 1907 | |
| 3 | Ed Sparks# | 1.226 | 1903 | |
| 4 | Buster Scott | 1.231 | 1878 | |
| 5 | Abel Kizzie | 1.322 | 1881 | |
| 6 | Charles Heim# | 1.387 | 1907 | |
| 6 | Charles Heim# | 1.387 | 1905 | |
| 8 | Billy Roberson | 1.393 | 1879 | |
| 9 | Ed Sparks# | 1.399 | 1905 | |
| 10 | Willie Davis | 1.409 | 1879 | |
| 11 | Cal Ames | 1.422 | 1884 | |
| 12 | Martin Tucker | 1.447 | 1879 | |
| 13 | Ed Sparks# | 1.449 | 1906 | |
| 14 | Pat Murphy | 1.459 | 1876 | |
| 15 | Frank Dransfield# | 1.469 | 1904 | |
| 16 | Bill Hanrahan# | 1.471 | 1906 | |
| 17 | Jim Hess# | 1.475 | 1907 | |
| 18 | Sam Weiss# | 1.495 | 1907 | |
| 19 | Chas Duffey | 1.524 | 1876 | |
| 20 | Ed Sparks# | 1.546 | 1907 | |
| 21 | Billy Crutchfield | 1.549 | 1883 | |
| 22 | Nate Chadwick | 1.562 | 1884 | |
| 23 | Jim Cannon | 1.565 | 1878 | |
| 24 | Harry Hartmann# | 1.614 | 1904 | |
| 25 | Joe Connors# | 1.618 | 1907 | |
| 26 | Frank Dransfield# | 1.619 | 1906 | |
| 27 | Frank Hawthorne# | 1.623 | 1907 | |
| 28 | Al Lynn | 1.627 | 1884 | |
| 29 | Joe Marshall# | 1.631 | 1907 | |
| 30 | Martin Tucker | 1.638 | 1880 | |
| 31 | Charles Heim# | 1.658 | 1906 | |
| 32 | Bill Hanrahan# | 1.665 | 1904 | |
| 33 | John Richard | 1.668 | 1880 | |
| 34 | Andrew LaChance# | 1.699 | 1903 | |
| 35 | Edgar Monroe | 1.706 | 1879 | |
| 36 | Kevin McCart | 1.714 | 1876 | |
| 37 | Harry Hartmann# | 1.722 | 1906 | |
| 37 | Hank Jung# | 1.722 | 1905 | |
| 39 | Lee Fallon# | 1.731 | 1907 | |
| 40 | Judson Perry | 1.735 | 1886 | |
| 41 | Frank Dransfield# | 1.736 | 1902 | |
| 42 | Jack Beckwith# | 1.754 | 1907 | |
| 43 | Fred Wilson# | 1.770 | 1907 | |
| 44 | Mike Goodwin# | 1.782 | 1907 | |
| 45 | Harry Hartmann# | 1.783 | 1905 | |
| 46 | Eddie Gill# | 1.789 | 1907 | |
| 47 | Elmer Meier# | 1.793 | 1904 | |
| 48 | Paul Kennett | 1.802 | 1876 | |
| 49 | Frank Dransfield# | 1.808 | 1903 | |
| 50 | Pete Van Artsdalen# | 1.812 | 1906 | |
| 51 | Lew Stiggers | 1.814 | 1904 | |
| 51 | Will Beaumont | 1.814 | 1906 | |
| 53 | Jim Hess# | 1.819 | 1904 | |
| 54 | Jack Pendleton | 1.826 | 1889 | |
| 55 | Johnny Wallace | 1.827 | 1886 | |
| 56 | Frank Dransfield# | 1.828 | 1905 | |
| 57 | Frank Hawthorne# | 1.842 | 1906 | |
| 58 | Dan Farham | 1.852 | 1876 | |
| 59 | Joe Connors# | 1.854 | 1906 | |
| 60 | Lew Stiggers | 1.857 | 1901 | |
| 60 | Clyde Wilkes | 1.857 | 1888 | |
| 62 | Herbert Thayer | 1.870 | 1886 | |
| 63 | Doc Freeman# | 1.872 | 1904 | |
| 64 | Benny Crowell# | 1.875 | 1907 | |
| 65 | Hank Jung# | 1.877 | 1906 | |
| 66 | Hiram Keys | 1.879 | 1878 | |
| 67 | Dan LeBoeuf | 1.881 | 1886 | |
| 68 | Gus Schneider | 1.882 | 1888 | |
| 69 | Willie Cronauer# | 1.888 | 1906 | |
| 70 | Will Dixon# | 1.892 | 1906 | |
| 71 | Johnny Wallace | 1.897 | 1885 | |
| 72 | Gus Schneider | 1.900 | 1902 | |
| 73 | Ed Sparks# | 1.901 | 1904 | |
| 73 | Samuel Schuyler | 1.901 | 1877 | |
| 73 | Willie Davis | 1.901 | 1880 | |
| 76 | Lew Stiggers | 1.905 | 1905 | |
| 77 | Harry Hartmann# | 1.909 | 1890 | |
| 78 | Jim Hess# | 1.912 | 1905 | |
| 79 | Edgar Monroe | 1.916 | 1881 | |
| 80 | John Jenkins# | 1.921 | 1905 | |
| 81 | Pete Van Artsdalen# | 1.922 | 1904 | |
| 82 | Otto Hinz | 1.923 | 1901 | |
| 83 | Marty Keegan# | 1.926 | 1907 | |
| 84 | Gene Bailey# | 1.927 | 1906 | |
| 85 | Will Ryan | 1.933 | 1878 | |
| 86 | Tom Gower# | 1.956 | 1904 | |
| 87 | Irv Thomas# | 1.958 | 1907 | |
| 88 | Lew Anthony | 1.960 | 1886 | |
| 89 | Bill Miller# | 1.962 | 1907 | |
| 90 | Bill Austin# | 1.963 | 1906 | |
| 91 | Walt Lopp | 1.965 | 1885 | |
| 92 | Carl Braud# | 1.967 | 1907 | |
| 93 | Billy Crutchfield | 1.968 | 1884 | |
| 94 | Herbert Thayer | 1.969 | 1888 | |
| 95 | Jack Thompson# | 1.970 | 1907 | |
| 96 | Leo Miller | 1.976 | 1876 | |
| 96 | Joe Chastain | 1.976 | 1903 | |
| 98 | Heck Williams | 1.981 | 1878 | |
| 99 | Ed Moriarty# | 1.985 | 1904 | |
| 100 | Lou Scudder | 1.996 | 1888 |
