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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 | Henry Young | 2.175 | 1884-1884 | |
| 4 | Otis Sheehan# | 2.331 | 1884-1890 | |
| 5 | Lou Gibbs# | 2.376 | 1888-1890 | |
| 6 | Pat Tuckett# | 2.387 | 1888-1890 | |
| 7 | Daniel Fallow | 2.470 | 1884-1885 | |
| 8 | Charley Pfeiffer# | 2.514 | 1888-1890 | |
| 9 | Will Truitt# | 2.613 | 1888-1890 | |
| 10 | Steve Thorpe# | 2.782 | 1886-1890 | |
| 11 | Henry King | 2.807 | 1884-1884 | |
| 12 | George Grey# | 3.077 | 1888-1890 | |
| 13 | George Mulligan# | 3.090 | 1884-1887 | |
| 14 | Ed Murdock# | 3.117 | 1888-1890 | |
| 15 | Pat Murphy# | 3.141 | 1884-1890 | |
| 16 | Ernie Kraus# | 3.190 | 1884-1890 | |
| 17 | Gene Carter# | 3.201 | 1884-1885 | |
| 18 | Hiram Keys# | 3.210 | 1884-1890 | |
| 19 | Vic Kenyon# | 3.237 | 1886-1890 | |
| 20 | Herbert Goodwin# | 3.244 | 1886-1890 | |
| 21 | Gus McGuire# | 3.263 | 1884-1890 | |
| 22 | Jim Weber# | 3.284 | 1886-1890 | |
| 23 | Harvey Holmes# | 3.294 | 1884-1890 | |
| 24 | Hank Sherrod# | 3.315 | 1884-1888 | |
| 25 | Willis McAdory | 3.321 | 1886-1888 | |
| 26 | Nate Pickett# | 3.503 | 1886-1890 | |
| 27 | Vic Montague# | 3.528 | 1886-1890 | |
| 28 | Henry Moody | 3.592 | 1884-1886 | |
| 29 | Hank Lilly# | 3.623 | 1884-1886 | |
| 30 | Will Morrill# | 3.652 | 1886-1890 | |
| 31 | George Dillingham# | 3.698 | 1884-1890 | |
| 32 | Herbert Crosby# | 3.771 | 1886-1890 | |
| 33 | Alfred Bush | 3.773 | 1884-1885 | |
| 34 | Joe Kessler# | 3.837 | 1886-1890 | |
| 35 | Nate Mahoney# | 3.845 | 1884-1890 | |
| 36 | Ray Browne# | 4.108 | 1887-1889 | |
| 37 | Rufus Thomas# | 4.299 | 1884-1890 | |
| 38 | Ben Trease# | 4.367 | 1886-1890 | |
| 39 | Joe Whiteside# | 4.575 | 1886-1887 | |
| 40 | Phil Hull# | 4.639 | 1886-1890 | |
| 41 | Hank Gibson# | 5.074 | 1886-1888 | |
| 42 | Fred Pinckney | 5.113 | 1886-1887 | |
| 43 | Lester McPherson | 5.410 | 1884-1886 | |
| 44 | Tom Scott# | 6.196 | 1886-1887 |
