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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Ed Wood | 0.265 | 1932-1947 | |
| 2 | Charlie Sis* | 0.766 | 1903-1921 | |
| 3 | Bill McDaniel | 1.276 | 1901-1913 | |
| 4 | Charlie Firestone* | 1.286 | 1912-1919 | |
| 5 | Dan Tyler | 1.562 | 1909-1918 | |
| 6 | Bob Young | 1.800 | 1908-1920 | |
| 7 | Butch Smith# | 1.884 | 1938-1947 | |
| 8 | Don Noftall | 1.913 | 1892-1903 | |
| 9 | Jim Golden* | 1.973 | 1909-1920 | |
| 10 | Gil Purdy | 2.057 | 1901-1916 | |
| 11 | Bill Ross | 2.090 | 1920-1936 | |
| 12 | George Johnson* | 2.093 | 1907-1926 | |
| 13 | Woody Trease* | 2.217 | 1901-1912 | |
| 14 | Mose Smith | 2.302 | 1915-1929 | |
| 15 | Joe Myres | 2.308 | 1916-1927 | |
| 16 | Ike Bell | 2.361 | 1899-1906 | |
| 17 | Mike Robinson | 2.368 | 1908-1911 | |
| 18 | Jim Lonardo | 2.485 | 1928-1947 | |
| 19 | Charlie Wilson* | 2.559 | 1889-1901 | |
| 20 | Chris Clarke# | 2.585 | 1937-1947 | |
| 21 | Bob Harris | 2.641 | 1910-1917 | |
| 22 | Bill Temple* | 2.652 | 1899-1911 | |
| 23 | Allan Allen* | 2.700 | 1890-1909 | |
| 24 | Isaac Meyer | 2.872 | 1908-1919 | |
| 25 | Bill West | 3.072 | 1904-1917 | |
| 26 | Rufus Barrell II# | 3.073 | 1938-1947 | |
| 27 | Pete Boyer | 3.094 | 1915-1926 | |
| 28 | Rabbit Day | 3.200 | 1927-1944 | |
| 29 | Billy Riley# | 3.240 | 1938-1947 | |
| 30 | Red Ross# | 3.250 | 1936-1947 | |
| 31 | Mike Marner* | 3.298 | 1907-1918 | |
| 32 | Luke Smith | 3.306 | 1916-1929 | |
| 33 | John Blackburn | 3.441 | 1904-1909 | |
| 34 | Bob Johnston | 3.456 | 1905-1919 | |
| 35 | Harry Horn | 3.468 | 1921-1934 | |
| 36 | George Davis | 3.489 | 1916-1928 | |
| 37 | Walt Wells# | 3.649 | 1935-1947 | |
| 38 | John Bigness | 3.703 | 1897-1912 | |
| 39 | Clem Rothstein | 3.706 | 1908-1918 | |
| 40 | Tom Barrell | 3.857 | 1932-1945 | |
| 41 | Fred Henry | 3.884 | 1895-1907 | |
| 42 | John Jones | 4.010 | 1909-1917 | |
| 43 | Morris Harris | 4.014 | 1892-1906 | |
| 44 | Russ Reel | 4.154 | 1929-1936 | |
| 45 | Dick Richards | 4.200 | 1923-1935 | |
| 46 | Sammy Butler | 4.500 | 1916-1929 | |
| 47 | Dean Astle | 4.545 | 1933-1946 | |
| 48 | Lefty Allen# | 4.821 | 1935-1947 | |
| 49 | Alvin Hensley | 4.909 | 1899-1909 | |
| 50 | Alexander Elliott | 5.366 | 1886-1906 | |
| 51 | Charlie Stedman | 6.337 | 1926-1942 |
