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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Pete Hood | 1.098 | 1880 | |
| 2 | Buster Scott | 1.231 | 1878 | |
| 3 | Ike Bell | 1.250 | 1904 | |
| 4 | Woody Trease* | 1.292 | 1908 | |
| 5 | Edwin Dudley | 1.322 | 1881 | |
| 6 | Henry Ganus | 1.330 | 1882 | |
| 7 | Thomas Giles | 1.353 | 1892 | |
| 8 | George Wilson | 1.392 | 1906 | |
| 9 | Billy Roberson | 1.393 | 1879 | |
| 10 | Jim Cox | 1.406 | 1885 | |
| 11 | Willie Davis | 1.409 | 1879 | |
| 12 | Mike Marner* | 1.414 | 1908 | |
| 13 | George Clark | 1.422 | 1884 | |
| 14 | Ike Bell | 1.438 | 1901 | |
| 15 | Martin Tucker | 1.447 | 1879 | |
| 16 | Bill Temple* | 1.449 | 1906 | |
| 16 | Allan Allen* | 1.449 | 1904 | |
| 18 | Hartigan O'Carroll | 1.459 | 1876 | |
| 19 | Mike Marner* | 1.472 | 1907 | |
| 20 | Charlie Sis* | 1.477 | 1905 | |
| 21 | George Burger | 1.482 | 1908 | |
| 22 | George Wilson | 1.503 | 1908 | |
| 23 | Bill West | 1.505 | 1905 | |
| 24 | Mike Marner* | 1.519 | 1914 | |
| 25 | Chas Duffey | 1.524 | 1876 | |
| 26 | Charlie Sis* | 1.540 | 1910 | |
| 27 | Billy Crutchfield | 1.549 | 1883 | |
| 28 | Mike Marner* | 1.553 | 1910 | |
| 29 | Bill McDaniel | 1.562 | 1904 | |
| 29 | Charles Williams | 1.562 | 1884 | |
| 31 | Jim Cannon | 1.565 | 1878 | |
| 32 | Don Cannaday | 1.566 | 1916 | |
| 33 | Billy Martindale | 1.578 | 1908 | |
| 34 | Joe Broege | 1.608 | 1902 | |
| 35 | Ferdinand Hawkins | 1.611 | 1884 | |
| 35 | Lou Ellertson | 1.611 | 1945 | |
| 37 | Bill Betts | 1.618 | 1907 | |
| 38 | Johnny Thompson | 1.627 | 1884 | |
| 39 | Jimmy Redpath | 1.630 | 1907 | |
| 40 | Joe Ballman | 1.634 | 1901 | |
| 41 | Warren Meyers | 1.636 | 1905 | |
| 41 | John Bates | 1.636 | 1882 | |
| 43 | Aaron Frantz | 1.638 | 1909 | |
| 43 | Martin Tucker | 1.638 | 1880 | |
| 45 | Bob Allenbaugh | 1.640 | 1908 | |
| 45 | Woody Trease* | 1.640 | 1907 | |
| 47 | Mike Robinson | 1.644 | 1908 | |
| 48 | Frank Maroney | 1.648 | 1883 | |
| 49 | George Davis | 1.651 | 1916 | |
| 50 | Allan Allen* | 1.657 | 1892 | |
| 51 | George Gapp | 1.660 | 1902 | |
| 52 | James Wigfall | 1.662 | 1906 | |
| 53 | Bob Wilson | 1.666 | 1917 | |
| 54 | John Richard | 1.668 | 1880 | |
| 55 | Denny Wren | 1.676 | 1916 | |
| 56 | Woody Trease* | 1.689 | 1906 | |
| 57 | Ralph Williams | 1.693 | 1888 | |
| 57 | Bill Temple* | 1.693 | 1908 | |
| 59 | Mack Walker | 1.696 | 1882 | |
| 59 | Jim Golden* | 1.696 | 1916 | |
| 61 | Elmer Manuel | 1.706 | 1879 | |
| 62 | Kevin McCart | 1.714 | 1876 | |
| 63 | Al Bachman | 1.723 | 1914 | |
| 64 | John Bigness | 1.729 | 1903 | |
| 64 | Bill Temple* | 1.729 | 1904 | |
| 66 | Everett Thomas | 1.731 | 1882 | |
| 67 | Judson Perry | 1.735 | 1886 | |
| 68 | Will Welles | 1.739 | 1890 | |
| 69 | Charlie Firestone* | 1.744 | 1914 | |
| 70 | Rufus Barrell II# | 1.760 | 1942 | |
| 71 | Fred Henry | 1.761 | 1904 | |
| 71 | Frank Maroney | 1.761 | 1885 | |
| 73 | George Johnson* | 1.771 | 1916 | |
| 74 | John Whitten | 1.776 | 1906 | |
| 75 | Rod Kratz | 1.781 | 1918 | |
| 76 | Alex Cole | 1.793 | 1890 | |
| 77 | Gil Purdy | 1.800 | 1903 | |
| 77 | Marty Jones | 1.800 | 1916 | |
| 77 | Bill West | 1.800 | 1908 | |
| 80 | Paul Kennett | 1.802 | 1876 | |
| 81 | Tom O'Leary | 1.805 | 1904 | |
| 82 | Charlie Sis* | 1.808 | 1914 | |
| 82 | Tom Edwards | 1.808 | 1905 | |
| 84 | Gil Purdy | 1.811 | 1904 | |
| 85 | Tom Wales | 1.812 | 1908 | |
| 85 | Jack Lopp | 1.812 | 1882 | |
| 87 | Luke Smith | 1.814 | 1917 | |
| 88 | Ike Campbell | 1.815 | 1908 | |
| 89 | Dick Heiliger | 1.817 | 1908 | |
| 90 | Pep McCormick | 1.819 | 1907 | |
| 90 | Woody Trease* | 1.819 | 1909 | |
| 92 | Allan Allen* | 1.822 | 1902 | |
| 93 | Allan Allen* | 1.825 | 1907 | |
| 94 | Ike Edwards | 1.826 | 1889 | |
| 95 | Bill McDaniel | 1.827 | 1908 | |
| 95 | Johnny Wallace | 1.827 | 1886 | |
| 97 | Bill Temple* | 1.839 | 1907 | |
| 98 | George Burger | 1.843 | 1905 | |
| 98 | Charlie Firestone* | 1.843 | 1915 | |
| 100 | Charlie Sis* | 1.852 | 1904 |
