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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 | Otis Sheehan# | 2.675 | 1884-1893 | |
| 6 | Henry King | 2.807 | 1884-1884 | |
| 7 | Pat Tuckett# | 2.880 | 1888-1893 | |
| 8 | George Mulligan# | 3.090 | 1884-1887 | |
| 9 | Will Truitt# | 3.136 | 1888-1893 | |
| 10 | Hiram Keys | 3.154 | 1884-1892 | |
| 11 | Hank Sherrod# | 3.155 | 1884-1893 | |
| 12 | Pat Murphy# | 3.166 | 1884-1892 | |
| 13 | Gene Carter | 3.201 | 1884-1885 | |
| 14 | Gus McGuire# | 3.222 | 1884-1893 | |
| 15 | Sam Toole# | 3.257 | 1892-1893 | |
| 16 | Steve Thorpe# | 3.279 | 1886-1893 | |
| 17 | Willis McAdory | 3.321 | 1886-1888 | |
| 18 | Jim Weber# | 3.359 | 1886-1893 | |
| 19 | Herbert Goodwin# | 3.362 | 1886-1893 | |
| 20 | Ernie Kraus# | 3.422 | 1884-1893 | |
| 21 | Harvey Holmes# | 3.473 | 1884-1893 | |
| 22 | Ed Murdock# | 3.533 | 1888-1893 | |
| 23 | Horatio Fry# | 3.539 | 1892-1893 | |
| 24 | Vic Kenyon# | 3.550 | 1886-1893 | |
| 25 | Al McDonough# | 3.562 | 1891-1893 | |
| 26 | Lou Gibbs# | 3.576 | 1888-1893 | |
| 27 | Nate Pickett# | 3.590 | 1886-1893 | |
| 28 | Henry Moody | 3.592 | 1884-1886 | |
| 29 | Joseph Wadsworth# | 3.602 | 1892-1893 | |
| 30 | Hank Lilly# | 3.623 | 1884-1886 | |
| 31 | Vic Montague# | 3.680 | 1886-1893 | |
| 32 | Will Morrill# | 3.726 | 1886-1893 | |
| 33 | Herbert Crosby# | 3.758 | 1886-1892 | |
| 34 | Alfred Bush | 3.773 | 1884-1885 | |
| 35 | George Dillingham# | 3.784 | 1884-1893 | |
| 36 | Nate Mahoney# | 3.822 | 1884-1893 | |
| 37 | Ed Fischer# | 3.849 | 1891-1893 | |
| 38 | George Grey# | 3.871 | 1888-1893 | |
| 39 | Joe Kessler | 3.942 | 1886-1891 | |
| 40 | Thomas Churchville# | 4.025 | 1892-1893 | |
| 41 | Robert Wojtowicz# | 4.029 | 1892-1893 | |
| 42 | Ray Browne# | 4.108 | 1887-1889 | |
| 43 | Fred Watton# | 4.189 | 1891-1893 | |
| 44 | Gene Flaherty# | 4.221 | 1887-1892 | |
| 45 | Marty Cosker# | 4.239 | 1891-1893 | |
| 46 | Lou Jewett# | 4.277 | 1891-1891 | |
| 47 | Rufus Thomas# | 4.299 | 1884-1893 | |
| 48 | Al Lynn# | 4.323 | 1888-1893 | |
| 49 | Phil Hull# | 4.350 | 1886-1893 | |
| 50 | Ben Trease | 4.367 | 1886-1890 | |
| 51 | Bartholomew Becker# | 4.407 | 1892-1893 | |
| 52 | Joe Whiteside# | 4.575 | 1886-1887 | |
| 53 | Hank Gibson# | 5.074 | 1886-1888 | |
| 54 | Fred Pinckney | 5.113 | 1886-1887 | |
| 55 | Lester McPherson | 5.410 | 1884-1886 | |
| 56 | Tom Scott# | 6.196 | 1886-1887 |
