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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | H9 | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Claude Passeau# | 3.78 | 1945 | |
| 2 | Bucky Walters# | 4.00 | 1940 | |
| 3 | Mort Cooper# | 5.06 | 1944 | |
| 4 | Mort Cooper# | 6.19 | 1943 | |
| 5 | Bobo Newsom# | 6.23 | 1940 | |
| 6 | Denny Galehouse# | 6.50 | 1944 | |
| 7 | Red Ruffing# | 7.13 | 1942 | |
| 8 | Max Lanier# | 7.63 | 1943 | |
| 9 | Schoolboy Rowe# | 8.02 | 1934 | |
| 10 | Schoolboy Rowe# | 8.14 | 1935 | |
| 11 | Spud Chandler# | 8.50 | 1943 | |
| 11 | Red Ruffing# | 8.50 | 1938 | |
| 11 | Johnny Beazley# | 8.50 | 1942 | |
| 14 | Tommy Bridges# | 9.00 | 1935 | |
| 15 | Hank Borowy# | 10.50 | 1945 | |
| 16 | Hal Newhouser# | 10.89 | 1945 | |
| 17 | Tommy Bridges# | 10.90 | 1934 |
