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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | OSLG | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Claude Passeau# | .1273 | 1945 | |
| 2 | Bucky Walters# | .1333 | 1940 | |
| 3 | Bobo Newsom# | .1957 | 1940 | |
| 4 | Mort Cooper# | .2105 | 1944 | |
| 5 | Schoolboy Rowe# | .2317 | 1934 | |
| 6 | Mort Cooper# | .2373 | 1943 | |
| 7 | Spud Chandler# | .2464 | 1943 | |
| 8 | Max Lanier# | .2712 | 1943 | |
| 9 | Denny Galehouse# | .2923 | 1944 | |
| 10 | Red Ruffing# | .2941 | 1938 | |
| 11 | Hank Borowy# | .2958 | 1945 | |
| 12 | Hal Newhouser# | .2976 | 1945 | |
| 13 | Tommy Bridges# | .3000 | 1935 | |
| 14 | Schoolboy Rowe# | .3012 | 1935 | |
| 15 | Red Ruffing# | .3030 | 1942 | |
| 16 | Johnny Beazley# | .3286 | 1942 | |
| 17 | Tommy Bridges# | .3288 | 1934 |
