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| |
| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Fred Cathey# | 1.821 | 1888-1889 | |
| 2 | Lew Townsel# | 2.148 | 1888-1890 | |
| 3 | Dan Farham | 2.470 | 1884-1885 | |
| 4 | Charley Pfeiffer# | 2.514 | 1888-1890 | |
| 5 | Ray Anson# | 2.774 | 1897-1899 | |
| 6 | Otis Sheehan# | 2.831 | 1884-1899 | |
| 7 | Pat Tuckett# | 2.891 | 1888-1894 | |
| 8 | Sam Barksdale# | 2.913 | 1897-1899 | |
| 9 | George Mulligan# | 3.090 | 1884-1887 | |
| 10 | Will Truitt | 3.136 | 1888-1893 | |
| 11 | Hiram Keys | 3.154 | 1884-1892 | |
| 12 | Pat Murphy | 3.166 | 1884-1892 | |
| 13 | Hank Sherrod# | 3.181 | 1884-1898 | |
| 14 | Gene Carter | 3.201 | 1884-1885 | |
| 15 | Gus McGuire | 3.218 | 1884-1894 | |
| 16 | Fletcher Dabney# | 3.226 | 1897-1899 | |
| 17 | Joe Delahanty# | 3.257 | 1895-1899 | |
| 18 | Ned Flannery# | 3.304 | 1894-1899 | |
| 19 | Bill Wainwright# | 3.314 | 1894-1899 | |
| 20 | Willis McAdory | 3.321 | 1886-1888 | |
| 21 | Jim Weber | 3.334 | 1886-1899 | |
| 22 | Steve Thorpe# | 3.359 | 1886-1895 | |
| 23 | Herbert Goodwin# | 3.384 | 1886-1899 | |
| 24 | Win Redmond# | 3.396 | 1894-1899 | |
| 25 | Ed Farley# | 3.441 | 1894-1899 | |
| 26 | Ernie Kraus# | 3.445 | 1884-1899 | |
| 27 | Vic Kenyon# | 3.488 | 1886-1897 | |
| 28 | Mike Sullivan# | 3.497 | 1895-1899 | |
| 29 | Harvey Holmes# | 3.506 | 1884-1897 | |
| 30 | Ed Murdock# | 3.547 | 1888-1898 | |
| 31 | Joseph Wadsworth# | 3.572 | 1892-1894 | |
| 32 | Hank Lilly | 3.623 | 1884-1886 | |
| 33 | Frank Mulrooney# | 3.651 | 1896-1899 | |
| 34 | Vic Montague# | 3.655 | 1886-1896 | |
| 35 | Frank Hawthorne# | 3.667 | 1894-1899 | |
| 36 | Frank Wilder# | 3.694 | 1896-1899 | |
| 37 | Fred Watton# | 3.702 | 1891-1899 | |
| 38 | Ed Sharp# | 3.704 | 1896-1899 | |
| 39 | Will Morrill# | 3.706 | 1886-1899 | |
| 40 | Horatio Fry# | 3.717 | 1892-1896 | |
| 41 | Sam Tilden# | 3.726 | 1894-1899 | |
| 42 | Lou Gibbs# | 3.755 | 1888-1899 | |
| 43 | Herbert Crosby# | 3.758 | 1886-1892 | |
| 44 | Nate Mahoney | 3.764 | 1884-1898 | |
| 45 | Nate Pickett | 3.768 | 1886-1897 | |
| 46 | Alfred Bush | 3.773 | 1884-1885 | |
| 47 | Sam Toole# | 3.836 | 1892-1899 | |
| 48 | George Grey# | 3.906 | 1888-1899 | |
| 49 | Joe Kessler | 3.942 | 1886-1891 | |
| 50 | Lou Blackwell# | 3.972 | 1894-1899 | |
| 51 | Joseph Stone# | 4.006 | 1892-1897 | |
| 52 | Robert Wojtowicz# | 4.028 | 1892-1895 | |
| 53 | Harrison Wentworth# | 4.056 | 1894-1899 | |
| 54 | Thomas Churchville# | 4.093 | 1892-1899 | |
| 55 | Jim Sutherland# | 4.100 | 1894-1899 | |
| 56 | Ray Browne | 4.108 | 1887-1889 | |
| 57 | Jim Gallivan# | 4.157 | 1894-1899 | |
| 58 | Rube Seidel# | 4.164 | 1896-1899 | |
| 59 | Marty Cosker# | 4.200 | 1891-1898 | |
| 60 | Gene Flaherty# | 4.221 | 1887-1892 | |
| 61 | Phil Hull# | 4.263 | 1886-1899 | |
| 62 | Vic Caldwell# | 4.301 | 1895-1899 | |
| 63 | Rufus Thomas# | 4.303 | 1884-1899 | |
| 64 | Ben Trease | 4.367 | 1886-1890 | |
| 65 | Al Lynn# | 4.427 | 1888-1899 | |
| 66 | Joe Whiteside# | 4.575 | 1886-1887 | |
| 67 | Bartholomew Becker# | 4.616 | 1892-1897 | |
| 68 | Al Holloway# | 4.705 | 1896-1899 | |
| 69 | Frank Hunter# | 4.859 | 1897-1899 | |
| 70 | Fred Pinckney | 5.113 | 1886-1887 |
