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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Paul Burke | 0.793 | 1946 | |
| 2 | Matthew Sullivan* | 0.979 | 1909 | |
| 3 | Joe Shannon* | 1.017 | 1942 | |
| 4 | Brock Rutherford* | 1.101 | 1926 | |
| 5 | Matthew Sullivan* | 1.160 | 1908 | |
| 6 | Phineas Flint | 1.190 | 1905 | |
| 7 | Percell Russell* | 1.191 | 1946 | |
| 8 | Jacob Norwood* | 1.281 | 1908 | |
| 9 | Hiram Ballard* | 1.306 | 1882 | |
| 10 | Tom Green* | 1.311 | 1946 | |
| 11 | Cookie Whaley | 1.326 | 1905 | |
| 11 | Abram Cutter | 1.326 | 1909 | |
| 13 | Jacob Norwood* | 1.338 | 1906 | |
| 14 | Rufe Hashman | 1.353 | 1945 | |
| 15 | Don Matthews | 1.355 | 1946 | |
| 16 | Matthew Sullivan* | 1.397 | 1907 | |
| 17 | Brock Rutherford* | 1.399 | 1937 | |
| 18 | Jacob Norwood* | 1.400 | 1910 | |
| 19 | Hank Tobey* | 1.419 | 1946 | |
| 20 | Cookie Whaley | 1.445 | 1908 | |
| 21 | Tom Green* | 1.463 | 1947 | |
| 22 | Jesse Nugent | 1.482 | 1905 | |
| 23 | Cookie Whaley | 1.488 | 1907 | |
| 24 | Percell Russell* | 1.491 | 1947 | |
| 25 | Jesse Nugent | 1.513 | 1906 | |
| 26 | Hugh West | 1.517 | 1885 | |
| 26 | Brock Rutherford* | 1.517 | 1927 | |
| 28 | Patrick Monday | 1.522 | 1930 | |
| 29 | Seth Seward | 1.535 | 1916 | |
| 29 | Tom Sanders* | 1.535 | 1880 | |
| 31 | Rufus Howe | 1.537 | 1906 | |
| 32 | Cookie Whaley | 1.539 | 1906 | |
| 32 | Brock Rutherford* | 1.539 | 1931 | |
| 34 | Eli Taylor* | 1.542 | 1880 | |
| 35 | Joe Shannon* | 1.547 | 1943 | |
| 36 | Cookie Whaley | 1.549 | 1904 | |
| 37 | Clay Baldwin* | 1.560 | 1920 | |
| 38 | Nathaniel Flannigan | 1.566 | 1908 | |
| 39 | Eli Taylor* | 1.570 | 1882 | |
| 40 | Gene Tiberi | 1.574 | 1943 | |
| 40 | Matthew Sullivan* | 1.574 | 1906 | |
| 42 | Nathaniel Flannigan | 1.588 | 1907 | |
| 42 | Matthew Sullivan* | 1.588 | 1910 | |
| 44 | Jacob Norwood* | 1.590 | 1907 | |
| 45 | Phil Cartlidge* | 1.592 | 1933 | |
| 46 | Bruce Cardenas# | 1.595 | 1966 | |
| 47 | Doc Scholl | 1.601 | 1909 | |
| 48 | Wesley Raab | 1.602 | 1907 | |
| 49 | Walker Price | 1.606 | 1908 | |
| 49 | Brock Rutherford* | 1.606 | 1933 | |
| 51 | Bob Schar# | 1.619 | 1972 | |
| 51 | Brock Rutherford* | 1.619 | 1932 | |
| 53 | Brock Rutherford* | 1.621 | 1928 | |
| 54 | Brock Rutherford* | 1.623 | 1930 | |
| 55 | Edgar Bath* | 1.629 | 1917 | |
| 56 | Erwin Morse | 1.654 | 1884 | |
| 57 | Mike Holly | 1.656 | 1908 | |
| 57 | Brock Rutherford* | 1.656 | 1935 | |
| 59 | Graham Thomas | 1.663 | 1882 | |
| 60 | Phil Cartlidge* | 1.666 | 1936 | |
| 61 | George Stonge* | 1.667 | 1879 | |
| 62 | Wesley Raab | 1.670 | 1905 | |
| 63 | Mike Holly | 1.673 | 1910 | |
| 63 | Joe Tonner | 1.673 | 1937 | |
| 65 | Chuck Munson* | 1.679 | 1942 | |
| 66 | Joel Solomon | 1.683 | 1915 | |
| 67 | Graham Thomas | 1.689 | 1885 | |
| 68 | Joshua Crowder | 1.698 | 1917 | |
| 69 | Fish Bridge | 1.702 | 1908 | |
| 69 | Ezra Park | 1.702 | 1906 | |
| 71 | Byron Kneeland | 1.705 | 1905 | |
| 72 | Rube Flood | 1.707 | 1888 | |
| 73 | Jacob Norwood* | 1.708 | 1909 | |
| 74 | Paul Burke | 1.716 | 1947 | |
| 75 | Jacob Norwood* | 1.721 | 1911 | |
| 76 | Eli Taylor* | 1.727 | 1881 | |
| 77 | Larry Diego# | 1.728 | 1968 | |
| 78 | Asa Peoples | 1.731 | 1908 | |
| 78 | Ed Payne# | 1.731 | 1972 | |
| 80 | Nick Forrester | 1.732 | 1907 | |
| 81 | Ice Clare | 1.733 | 1905 | |
| 82 | Brock Rutherford* | 1.734 | 1924 | |
| 83 | George Leavitt | 1.736 | 1909 | |
| 84 | Sander Carlson | 1.737 | 1917 | |
| 84 | Levi Earl | 1.737 | 1885 | |
| 86 | Harry Jones | 1.739 | 1883 | |
| 87 | Elijah Graves | 1.740 | 1913 | |
| 88 | Jacob Norwood* | 1.743 | 1904 | |
| 89 | Tom Green* | 1.748 | 1948 | |
| 90 | Aart MacDonald | 1.749 | 1945 | |
| 91 | Eli Taylor* | 1.760 | 1879 | |
| 92 | George Stonge* | 1.763 | 1882 | |
| 93 | Anthony Wilbur | 1.765 | 1888 | |
| 93 | John Smith | 1.765 | 1880 | |
| 95 | Harry Allison | 1.767 | 1879 | |
| 96 | Graham Thomas | 1.769 | 1884 | |
| 97 | Eli Taylor* | 1.770 | 1888 | |
| 98 | Hiram Ballard* | 1.774 | 1888 | |
| 98 | Abe Lowe | 1.774 | 1884 | |
| 100 | Andy Morrow | 1.775 | 1883 |
