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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Spud Chandler# | 0.500 | 1943 | |
| 2 | Mort Cooper# | 1.125 | 1944 | |
| 3 | Bobo Newsom# | 1.385 | 1940 | |
| 4 | Denny Galehouse# | 1.500 | 1944 | |
| 4 | Red Ruffing# | 1.500 | 1938 | |
| 4 | Bucky Walters# | 1.500 | 1940 | |
| 7 | Max Lanier# | 1.761 | 1943 | |
| 8 | Tommy Bridges# | 2.500 | 1935 | |
| 8 | Johnny Beazley# | 2.500 | 1942 | |
| 10 | Schoolboy Rowe# | 2.571 | 1935 | |
| 11 | Claude Passeau# | 2.700 | 1945 | |
| 12 | Mort Cooper# | 2.812 | 1943 | |
| 13 | Schoolboy Rowe# | 2.953 | 1934 | |
| 14 | Tommy Bridges# | 3.635 | 1934 | |
| 15 | Hank Borowy# | 4.000 | 1945 | |
| 16 | Red Ruffing# | 4.075 | 1942 | |
| 17 | Hal Newhouser# | 6.097 | 1945 |
