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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Bucky Walters# | 0.78 | 1940 | |
| 2 | Bobo Newsom# | 0.85 | 1940 | |
| 3 | Mort Cooper# | 0.88 | 1943 | |
| 3 | Mort Cooper# | 0.88 | 1944 | |
| 5 | Schoolboy Rowe# | 0.89 | 1934 | |
| 6 | Claude Passeau# | 0.90 | 1945 | |
| 7 | Schoolboy Rowe# | 0.95 | 1935 | |
| 8 | Denny Galehouse# | 1.00 | 1944 | |
| 9 | Max Lanier# | 1.04 | 1943 | |
| 10 | Red Ruffing# | 1.06 | 1938 | |
| 11 | Spud Chandler# | 1.11 | 1943 | |
| 11 | Johnny Beazley# | 1.11 | 1942 | |
| 13 | Red Ruffing# | 1.19 | 1942 | |
| 14 | Tommy Bridges# | 1.22 | 1935 | |
| 15 | Tommy Bridges# | 1.27 | 1934 | |
| 16 | Hal Newhouser# | 1.40 | 1945 | |
| 17 | Hank Borowy# | 1.50 | 1945 |
