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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Spud Chandler# | 1.149 | 1937-1946 | |
| 2 | Max Lanier# | 1.705 | 1938-1946 | |
| 3 | Red Ruffing# | 2.626 | 1924-1945 | |
| 4 | Mort Cooper# | 3.000 | 1938-1946 | |
| 5 | Tommy Bridges# | 3.522 | 1930-1946 | |
| 6 | Schoolboy Rowe# | 3.913 | 1933-1946 | |
| 7 | Hal Schumacher# | 4.133 | 1931-1942 |
