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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Fred Cathey | 2.498 | 1885-1887 | |
| 2 | Lew Townsel | 2.620 | 1884-1900 | |
| 3 | Ed Crockett# | 2.782 | 1903-1907 | |
| 4 | Alonzo Fitzsimmons | 2.951 | 1885-1887 | |
| 5 | Lew Stiggers | 3.026 | 1886-1890 | |
| 6 | Buck Thistle# | 3.043 | 1901-1903 | |
| 7 | Jack Bendlin# | 3.072 | 1903-1907 | |
| 8 | Art Vandelay# | 3.187 | 1901-1907 | |
| 9 | Ray Dreyer# | 3.213 | 1901-1907 | |
| 10 | Jim Marchand# | 3.234 | 1886-1890 | |
| 11 | Warren Schramm# | 3.235 | 1903-1907 | |
| 12 | Butts Parker# | 3.277 | 1901-1906 | |
| 13 | Lou Butler# | 3.283 | 1901-1903 | |
| 14 | Jack Thompson# | 3.284 | 1901-1906 | |
| 15 | George Pimentel# | 3.290 | 1901-1907 | |
| 16 | Bucky Freeman# | 3.408 | 1904-1907 | |
| 17 | Art Stricker# | 3.417 | 1901-1907 | |
| 18 | Cy Dineen# | 3.433 | 1903-1907 | |
| 19 | Dan Cannon# | 3.452 | 1901-1907 | |
| 20 | Nap Clampett# | 3.517 | 1901-1907 | |
| 21 | Frank Hildebrandt# | 3.518 | 1901-1907 | |
| 22 | Patrick Wilcoxen# | 3.526 | 1903-1907 | |
| 23 | Josh Leonard# | 3.586 | 1901-1907 | |
| 24 | Pete Corbin# | 3.600 | 1901-1907 | |
| 25 | Jack Hughes# | 3.657 | 1903-1907 | |
| 26 | Jerry Nymeyer# | 3.658 | 1901-1905 | |
| 27 | Ollie Naber# | 3.702 | 1904-1907 | |
| 28 | Emil Turner# | 3.745 | 1901-1907 | |
| 29 | Cecil Owen# | 3.749 | 1903-1907 | |
| 30 | Jesse Cape# | 3.765 | 1903-1907 | |
| 31 | Bobby Kimmel# | 3.766 | 1903-1907 | |
| 32 | Charlie Russell# | 3.863 | 1901-1907 | |
| 33 | Skel Kowalski | 3.875 | 1897-1900 | |
| 34 | Ed Shelton | 3.878 | 1901-1903 | |
| 35 | Ben O'Leary | 3.934 | 1886-1897 | |
| 36 | Charley Kearns | 3.953 | 1892-1900 | |
| 37 | Harry Mairs# | 3.962 | 1901-1907 | |
| 38 | George Bauer | 3.965 | 1886-1899 | |
| 39 | George Strickland# | 3.981 | 1904-1907 | |
| 40 | Bob Forrester# | 3.995 | 1901-1906 | |
| 41 | Ike Silsby | 4.005 | 1888-1900 | |
| 42 | Henry Holladay# | 4.012 | 1897-1900 | |
| 42 | Oliver Rafferty | 4.012 | 1884-1893 | |
| 44 | Emil Williams | 4.021 | 1901-1907 | |
| 45 | Eddie Locker# | 4.033 | 1901-1905 | |
| 46 | Clar Endicott | 4.040 | 1886-1899 | |
| 47 | Cozy Fairbanks | 4.074 | 1895-1900 | |
| 48 | Charley Pfeiffer# | 4.131 | 1896-1900 | |
| 49 | Harry Moore# | 4.142 | 1901-1907 | |
| 50 | Ernie Slone# | 4.169 | 1901-1907 | |
| 51 | Al Marshall | 4.176 | 1886-1891 | |
| 52 | Jake Redmond# | 4.185 | 1895-1897 | |
| 53 | Jack Prior# | 4.199 | 1901-1907 | |
| 54 | John Dobbs | 4.206 | 1892-1900 | |
| 55 | Forrest Smith# | 4.208 | 1903-1907 | |
| 56 | Vic Smith | 4.271 | 1892-1900 | |
| 57 | Jerry Kessler# | 4.288 | 1895-1900 | |
| 58 | Silas Lawton | 4.324 | 1884-1900 | |
| 59 | Win Prentiss# | 4.325 | 1897-1900 | |
| 60 | Art Baldwin | 4.348 | 1892-1900 | |
| 61 | Fred Babcock | 4.397 | 1894-1900 | |
| 62 | David Roper | 4.422 | 1888-1900 | |
| 63 | Ed Moriarty# | 4.450 | 1894-1900 | |
| 64 | Charley Pfeiffer | 4.453 | 1892-1900 | |
| 65 | Frank Kinsella# | 4.476 | 1895-1900 | |
| 66 | Charley Reinhardt | 4.543 | 1891-1900 | |
| 67 | Hank Wolff | 4.558 | 1886-1891 | |
| 68 | Chick Gallivan# | 4.647 | 1895-1900 | |
| 69 | Carney Kelleher | 4.656 | 1894-1897 | |
| 70 | Henry Howard# | 4.674 | 1897-1900 | |
| 71 | Stephen Fulton# | 4.741 | 1892-1900 | |
| 72 | Will Drouin | 4.813 | 1892-1894 | |
| 73 | Ned Lewis# | 4.826 | 1896-1900 | |
| 74 | Frank Davenport | 4.827 | 1894-1900 | |
| 75 | Robert Antonelli | 4.873 | 1893-1900 | |
| 76 | Walt Pelletier | 4.915 | 1886-1899 | |
| 77 | Henry Bauer | 4.937 | 1892-1900 | |
| 78 | Lou Scudder | 4.984 | 1891-1900 | |
| 79 | Mike Flynn | 5.001 | 1892-1899 | |
| 80 | Jeff Thomas | 5.113 | 1891-1900 | |
| 81 | Ernest Beale | 5.279 | 1886-1891 | |
| 82 | Harlan Matthews | 5.341 | 1897-1900 | |
| 83 | Bob Livingston | 5.346 | 1888-1899 | |
| 84 | John Sullivan | 5.548 | 1892-1900 | |
| 85 | James Oden | 6.024 | 1892-1900 | |
| 86 | David Finney | 6.232 | 1892-1900 |
