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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Jim Cox | 1.796 | 1882-1885 | |
| 2 | Bernard Witter# | 2.118 | 1889-1890 | |
| 3 | David Roper# | 2.192 | 1884-1887 | |
| 4 | Everett Thomas | 2.324 | 1882-1885 | |
| 5 | Gus McGuire# | 2.365 | 1882-1883 | |
| 6 | Charley Kearns# | 2.385 | 1887-1890 | |
| 7 | Edgar Kirkpatrick# | 2.401 | 1883-1884 | |
| 8 | Al McDonough# | 2.410 | 1884-1886 | |
| 9 | Michael Pitchford | 2.517 | 1883-1887 | |
| 10 | Ernest Benson# | 2.618 | 1889-1890 | |
| 11 | Herbert Harrison# | 2.622 | 1889-1890 | |
| 12 | Elmer Meier# | 2.632 | 1887-1889 | |
| 13 | Ray Hayden# | 2.675 | 1884-1890 | |
| 14 | Lou Daley# | 2.677 | 1886-1888 | |
| 15 | Irving Worcester# | 2.685 | 1882-1883 | |
| 16 | George Shelton | 2.755 | 1884-1887 | |
| 17 | Walt Pelletier# | 2.779 | 1883-1885 | |
| 18 | Hiram Keys# | 2.780 | 1882-1886 | |
| 19 | Mike Flynn# | 2.781 | 1882-1890 | |
| 20 | Ike Sawyer# | 2.844 | 1885-1889 | |
| 21 | Elmer Townsend# | 2.925 | 1886-1890 | |
| 22 | Moses Dales | 2.932 | 1885-1889 | |
| 23 | Hank Jung# | 2.937 | 1888-1890 | |
| 24 | John Bates | 2.941 | 1882-1887 | |
| 25 | Darren Kelly | 2.947 | 1882-1885 | |
| 26 | Al Watson# | 2.951 | 1888-1889 | |
| 27 | Art Leggett# | 2.958 | 1886-1890 | |
| 28 | Fred Lorraine# | 3.015 | 1884-1890 | |
| 29 | Joe Conley | 3.019 | 1884-1886 | |
| 30 | Frank McCabe# | 3.051 | 1886-1889 | |
| 31 | George Mulligan# | 3.094 | 1883-1889 | |
| 32 | Ernest Beale# | 3.133 | 1884-1885 | |
| 33 | Sidney Horace | 3.165 | 1883-1887 | |
| 34 | Vic Smith# | 3.173 | 1888-1890 | |
| 35 | Paul Dexter# | 3.183 | 1888-1890 | |
| 36 | Jasper Bonner# | 3.188 | 1882-1889 | |
| 37 | Herbert Vogel# | 3.230 | 1884-1889 | |
| 38 | Charles Brown | 3.231 | 1882-1885 | |
| 39 | Hiram Whitman# | 3.244 | 1882-1885 | |
| 40 | Frank Carmichael# | 3.253 | 1889-1890 | |
| 41 | Lou Allerton# | 3.301 | 1882-1885 | |
| 42 | Lou Staten# | 3.339 | 1889-1890 | |
| 43 | Lewis Dansby | 3.345 | 1883-1886 | |
| 44 | Walt Bollenbach# | 3.399 | 1887-1889 | |
| 45 | Clyde Wilkes# | 3.404 | 1887-1890 | |
| 46 | Will Leduc# | 3.430 | 1883-1885 | |
| 47 | Ernest Douglas# | 3.456 | 1882-1885 | |
| 48 | Abel Rucker# | 3.494 | 1883-1890 | |
| 49 | Bernard Holbrook# | 3.515 | 1888-1889 | |
| 50 | Silas Clements# | 3.519 | 1889-1890 | |
| 51 | Henry Young | 3.533 | 1885-1887 | |
| 52 | Roy Merriweather# | 3.543 | 1886-1890 | |
| 53 | George Roberts | 3.628 | 1885-1888 | |
| 54 | Vic Shreve# | 3.631 | 1888-1890 | |
| 55 | Alfred Marks# | 3.669 | 1884-1890 | |
| 56 | Vic Swain# | 3.688 | 1887-1890 | |
| 57 | Dave Woolridge | 3.763 | 1887-1888 | |
| 58 | Elmer Ramsay# | 3.849 | 1885-1890 | |
| 59 | Ernest Cleveland# | 3.875 | 1887-1888 | |
| 60 | Henry King | 3.917 | 1885-1889 | |
| 61 | Charlie Turner | 3.956 | 1883-1884 | |
| 62 | Ned Okereke | 4.062 | 1883-1885 | |
| 63 | Jacob Lewis | 4.068 | 1884-1886 | |
| 64 | Lou Gibbs# | 4.108 | 1885-1887 | |
| 65 | Walt Gilman# | 4.298 | 1886-1887 | |
| 66 | Press Wells | 4.414 | 1884-1885 | |
| 67 | Phil Blackburn# | 4.624 | 1883-1884 | |
| 68 | Ed Bannister# | 4.839 | 1888-1889 | |
| 69 | Bobby Hyman | 4.884 | 1884-1889 |
