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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Dan Barnett | .5237 | 1942-1945 | |
| 2 | Quincy Brown | .5127 | 1926-1931 | |
| 3 | Júlio Pacheco | .5103 | 1925-1928 | |
| 4 | Howard Hoskins | .4911 | 1932-1935 | |
| 5 | Chandler Dean | .4867 | 1927-1932 | |
| 6 | Chris Russell | .4838 | 1931-1935 | |
| 7 | Dennis O'Toole | .3969 | 1945-1948 | |
| 8 | Henry Davis | .3943 | 1928-1931 | |
| 9 | Lance Lange | .3793 | 1962-1967 | |
| 10 | Clint Williams | .3128 | 1948-1952 |
