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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Spud Chandler# | 1.02 | 1937-1946 | |
| 2 | Mort Cooper# | 1.09 | 1938-1946 | |
| 3 | Schoolboy Rowe# | 1.13 | 1933-1946 | |
| 4 | Max Lanier# | 1.14 | 1938-1946 | |
| 5 | Red Ruffing# | 1.18 | 1924-1946 | |
| 6 | Tommy Bridges# | 1.33 | 1930-1946 | |
| 7 | Hal Schumacher# | 1.65 | 1931-1946 |
