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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Garrett Rainville | .5132 | 1911-1924 | |
| 2 | Cal Anderson | .4622 | 1951-1961 | |
| 3 | Juan Piņa | .4042 | 1949-1954 | |
| 4 | Zander Robbins | .3987 | 1975-1985 | |
| 5 | Jarod Frawley | .3672 | 1952-1960 | |
| 6 | Walt Elliott | .3609 | 1917-1929 |
