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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Edgar Monroe | 2.247 | 1879-1885 | |
| 2 | Johnny Wallace | 2.525 | 1884-1887 | |
| 3 | Lew Stiggers# | 2.528 | 1885-1899 | |
| 4 | Edgar Kirkpatrick | 2.553 | 1880-1889 | |
| 5 | Herbert Thayer | 2.677 | 1882-1892 | |
| 6 | Cal Ames | 2.720 | 1882-1889 | |
| 7 | Al Lynn# | 2.803 | 1882-1886 | |
| 8 | Martin Tucker | 2.832 | 1879-1885 | |
| 9 | Michael Pitchford | 2.846 | 1876-1882 | |
| 10 | Billy Crutchfield | 2.909 | 1883-1888 | |
| 11 | Pat Murphy | 2.924 | 1876-1895 | |
| 11 | Dan LeBoeuf | 2.924 | 1885-1896 | |
| 13 | Lew Anthony | 2.928 | 1885-1889 | |
| 14 | Willie Davis | 2.990 | 1879-1885 | |
| 15 | Nate Chadwick | 2.995 | 1881-1889 | |
| 16 | Rufus Riddick | 3.034 | 1878-1896 | |
| 17 | Jim Cannon | 3.055 | 1878-1887 | |
| 18 | Bill Page | 3.063 | 1880-1888 | |
| 19 | Will Ryan | 3.111 | 1876-1880 | |
| 19 | Rufus Barrell# | 3.111 | 1892-1899 | |
| 21 | Ezra Lockhart# | 3.131 | 1879-1889 | |
| 22 | Otto Hinz# | 3.140 | 1889-1899 | |
| 23 | Dan Farham | 3.141 | 1876-1883 | |
| 24 | Harry Hartmann# | 3.179 | 1890-1899 | |
| 25 | David Atwood | 3.181 | 1889-1899 | |
| 25 | Gus Schneider# | 3.181 | 1884-1899 | |
| 27 | Paul Talbot# | 3.218 | 1890-1899 | |
| 28 | Homer Clayton# | 3.261 | 1897-1899 | |
| 28 | Lou Allerton | 3.261 | 1877-1895 | |
| 30 | Walt Lopp | 3.267 | 1880-1890 | |
| 31 | Bernard Bridges# | 3.272 | 1888-1899 | |
| 32 | Dan Kimball# | 3.297 | 1892-1899 | |
| 33 | Gene Wofford# | 3.351 | 1887-1892 | |
| 34 | Otis O'Brien | 3.360 | 1881-1895 | |
| 35 | Jack Pendleton# | 3.365 | 1889-1899 | |
| 36 | Hank Ludlow# | 3.372 | 1892-1899 | |
| 37 | Lou Daley# | 3.388 | 1889-1899 | |
| 38 | Will Bullock | 3.426 | 1880-1886 | |
| 39 | Lew Townsel# | 3.462 | 1892-1899 | |
| 40 | Sam Weiss# | 3.550 | 1896-1899 | |
| 41 | Ray Flowers# | 3.552 | 1886-1899 | |
| 42 | Walt Merritt# | 3.582 | 1888-1899 | |
| 43 | Art Leggett# | 3.596 | 1889-1899 | |
| 44 | Theo Heath# | 3.612 | 1892-1899 | |
| 45 | Lefty Babcock# | 3.620 | 1896-1899 | |
| 45 | Paul Dexter# | 3.620 | 1892-1899 | |
| 47 | Bernard Witter# | 3.633 | 1892-1899 | |
| 48 | Al McDonough# | 3.637 | 1887-1889 | |
| 49 | Joe Ashford# | 3.655 | 1888-1899 | |
| 50 | Duke Blackwell# | 3.660 | 1889-1899 | |
| 51 | Silas Lawton# | 3.690 | 1885-1896 | |
| 52 | Joe Chastain# | 3.692 | 1887-1899 | |
| 53 | Elmer Meier# | 3.713 | 1891-1899 | |
| 54 | Paul Lawson# | 3.753 | 1892-1899 | |
| 55 | Will Beaumont# | 3.755 | 1893-1899 | |
| 56 | Elmer Townsend# | 3.757 | 1891-1899 | |
| 57 | Jack Ellsworth# | 3.805 | 1888-1899 | |
| 58 | Jim Marchand# | 3.815 | 1885-1899 | |
| 59 | Herbert Wadsworth# | 3.824 | 1890-1899 | |
| 60 | George Satterfield# | 3.835 | 1890-1899 | |
| 61 | Hank Jung# | 3.870 | 1892-1899 | |
| 62 | Will Milner# | 3.880 | 1892-1899 | |
| 63 | Ray Draper# | 3.915 | 1887-1899 | |
| 64 | George Thorndike# | 3.916 | 1892-1899 | |
| 65 | Claude Newberry# | 3.926 | 1888-1899 | |
| 66 | Ed Dalrymple# | 3.983 | 1890-1894 | |
| 67 | Nate Cavanagh# | 4.000 | 1887-1899 | |
| 68 | Vic Shreve# | 4.012 | 1891-1899 | |
| 69 | Hank McCann# | 4.054 | 1891-1899 | |
| 70 | Len Darlington# | 4.159 | 1888-1899 | |
| 71 | Walt Bollenbach# | 4.287 | 1891-1899 | |
| 72 | Ernest Cleveland# | 4.401 | 1890-1897 | |
| 73 | Jack Granger# | 4.770 | 1894-1899 | |
| 74 | Rafe Lopez# | 4.833 | 1891-1896 | |
| 75 | Ray Hayden# | 4.845 | 1891-1899 |
