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| |
| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Patsy Fitzgerald# | .5119 | 1899 | |
| 2 | Mike Sullivan# | .5013 | 1899 | |
| 3 | Al Lynn# | .4865 | 1899 | |
| 4 | Bill Brunner# | .4681 | 1899 | |
| 5 | Ed Treadwell# | .4483 | 1899 | |
| 6 | Otis Dalton# | .4135 | 1899 | |
| 7 | Vic Simms# | .3848 | 1899 |
