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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Augusto Ramírez | .4734 | 1974-1986 | |
| 2 | Tom Parry | .4086 | 1937-1950 | |
| 3 | Jack MacNab | .4062 | 1928-1935 | |
| 4 | Manny Lorenzo# | .4031 | 1978-1990 | |
| 5 | Bruno Garcia | .3901 | 1935-1948 | |
| 6 | Carlos Gómez | .3819 | 1961-1969 | |
| 7 | Chris Sutcliffe | .3690 | 1924-1933 |
