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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Ralph Buxton# | 2.340 | 1934-1941 | |
| 2 | Satchel Paige# | 2.600 | 1928-1941 | |
| 3 | Bullet Rogan | 2.700 | 1921-1929 | |
| 4 | Tony Freitas# | 2.797 | 1928-1941 | |
| 5 | Dick Niehaus | 2.880 | 1921-1927 | |
| 6 | Howard Craghead# | 3.203 | 1926-1941 | |
| 7 | Bill Holland# | 3.254 | 1921-1936 | |
| 8 | John Donaldson | 3.447 | 1921-1926 | |
| 8 | Nip Winters | 3.447 | 1922-1932 | |
| 10 | Wayne Carr | 3.474 | 1921-1928 | |
| 11 | Ted Trent | 3.553 | 1930-1937 | |
| 12 | Frank Shellenback | 3.818 | 1921-1939 | |
| 13 | Fay Thomas# | 3.842 | 1930-1940 | |
| 14 | Manny Salvo# | 4.059 | 1932-1938 | |
| 15 | Syl Johnson# | 4.355 | 1921-1941 | |
| 16 | Willie Foster | 4.384 | 1924-1938 | |
| 17 | Lefty Gomez# | 4.967 | 1929-1941 | |
| 18 | Ed Brandt | 6.163 | 1924-1940 | |
| 19 | Sam Gibson# | 6.568 | 1931-1941 |
