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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Gustavo Quintero | .5313 | 1936-1939 | |
| 2 | Félix Vázquez | .5021 | 1942-1945 | |
| 3 | Monte Brando | .4961 | 1963-1967 | |
| 4 | Tim Hill | .4838 | 1943-1948 | |
| 5 | Harold Williams | .4737 | 1960-1963 | |
| 6 | Joseph Brandt | .4495 | 1928-1932 | |
| 7 | Johnny Lambert | .4258 | 1926-1929 | |
| 8 | Phil Bradshaw# | .4010 | 1981-1984 | |
| 9 | José Paresa# | .3882 | 1973-1977 | |
| 10 | Carl Kessler | .3812 | 1975-1978 | |
| 11 | José Miranda | .3534 | 1977-1981 | |
| 12 | Xavier Medina | .3526 | 1911-1916 |
