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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Rudy York# | .5788 | 1938 | |
| 2 | Bill Dickey# | .5698 | 1937 | |
| 3 | Bill Dickey# | .5683 | 1938 | |
| 4 | Ernie Lombardi# | .5235 | 1938 | |
| 5 | Bill Dickey# | .5125 | 1939 | |
| 6 | Bill Dickey# | .4895 | 1933 | |
| 7 | Ernie Lombardi# | .4867 | 1939 | |
| 8 | Frankie Hayes# | .4774 | 1940 | |
| 9 | Bill Dickey# | .4576 | 1935 | |
| 10 | Bill Dickey# | .4423 | 1931 | |
| 11 | Frankie Hayes# | .4419 | 1941 | |
| 12 | Ray Mueller# | .3982 | 1944 | |
| 13 | Frankie Hayes# | .3881 | 1936 | |
| 14 | Al Lopez# | .3827 | 1934 | |
| 15 | Rollie Hemsley# | .3810 | 1935 | |
| 16 | Ray Mueller# | .3794 | 1943 | |
| 17 | Frankie Hayes# | .3666 | 1944 | |
| 18 | Jake Early# | .3617 | 1943 | |
| 19 | Frankie Hayes# | .3515 | 1945 | |
| 20 | Mike Tresh# | .3396 | 1940 | |
| 21 | Mike Tresh# | .2751 | 1945 |
