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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | António Hernández# | .3850 | 1979-1990 | |
| 2 | Juan Mora | .3802 | 1923-1935 | |
| 3 | Luis Maldonado | .3702 | 1958-1968 | |
| 4 | Juan Longoria | .3684 | 1975-1988 | |
| 5 | Tom Leger# | .3431 | 1982-1990 |
