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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Buster Scott | 2.106 | 1884-1888 | |
| 2 | Fred Cathey# | 2.498 | 1885-1887 | |
| 3 | Lew Townsel# | 2.510 | 1884-1887 | |
| 4 | Abel Rucker# | 2.559 | 1884-1885 | |
| 5 | Alonzo Fitzsimmons | 2.951 | 1885-1887 | |
| 6 | Lucian Robinson | 3.002 | 1887-1888 | |
| 7 | Lew Stiggers# | 3.026 | 1886-1890 | |
| 8 | Pat Tuckett# | 3.124 | 1886-1887 | |
| 9 | Will Truitt# | 3.205 | 1886-1887 | |
| 10 | Jim Marchand# | 3.234 | 1886-1890 | |
| 11 | Cal Ames# | 3.594 | 1891-1893 | |
| 12 | Matt Thomas | 3.703 | 1886-1888 | |
| 13 | Ben OLeary# | 3.733 | 1886-1893 | |
| 14 | George Bauer# | 3.766 | 1886-1893 | |
| 15 | Charley Kearns# | 3.867 | 1892-1893 | |
| 16 | Clar Endicott# | 3.889 | 1886-1893 | |
| 17 | Fred Wilder# | 3.968 | 1888-1892 | |
| 18 | David Roper# | 3.990 | 1888-1893 | |
| 19 | Oliver Rafferty# | 4.012 | 1884-1893 | |
| 20 | Charley Pfeiffer# | 4.014 | 1892-1893 | |
| 21 | Denny McClister# | 4.049 | 1891-1892 | |
| 22 | Ike Silsby# | 4.062 | 1888-1893 | |
| 23 | John Dobbs# | 4.162 | 1892-1893 | |
| 24 | Al Marshall# | 4.176 | 1886-1891 | |
| 25 | Vic Smith# | 4.340 | 1892-1893 | |
| 26 | Charley Reinhardt# | 4.365 | 1891-1893 | |
| 27 | Robert Stevens# | 4.418 | 1892-1893 | |
| 28 | Ben Eberhardt# | 4.507 | 1886-1891 | |
| 29 | Hank Wolff# | 4.558 | 1886-1891 | |
| 30 | Edgar Kirkpatrick | 4.650 | 1891-1893 | |
| 31 | John Sullivan# | 4.679 | 1892-1893 | |
| 32 | David Howard# | 4.818 | 1892-1893 | |
| 33 | Will Drouin# | 4.829 | 1892-1893 | |
| 34 | Stephen Fulton# | 4.845 | 1892-1893 | |
| 35 | Lou Scudder# | 4.983 | 1891-1893 | |
| 36 | Phil Blackburn# | 5.165 | 1886-1891 | |
| 37 | Walt Pelletier# | 5.175 | 1886-1893 | |
| 38 | Henry Bauer# | 5.205 | 1892-1893 | |
| 39 | Ernest Beale# | 5.279 | 1886-1891 | |
| 40 | Mike Flynn# | 5.325 | 1892-1893 | |
| 41 | Bob Livingston# | 5.398 | 1888-1893 | |
| 42 | Walt Trask# | 5.439 | 1886-1893 | |
| 43 | Jeff Thomas# | 5.586 | 1891-1893 | |
| 44 | Zeb Hase# | 5.593 | 1891-1893 | |
| 45 | Herbert Monroe# | 5.721 | 1887-1893 | |
| 46 | Henry Young | 5.744 | 1888-1889 | |
| 47 | Levi Atkins# | 5.975 | 1886-1893 | |
| 48 | Jack Conley# | 6.243 | 1888-1890 | |
| 49 | David Finney# | 6.256 | 1892-1893 | |
| 50 | Burt Godwin# | 7.331 | 1891-1893 | |
| 51 | Hank Gibson# | 8.165 | 1886-1891 | |
| 52 | Tom Scott# | 9.714 | 1886-1891 | |
| 53 | Harry Hamilton | 10.482 | 1889-1890 |
