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| Progressive Slugging Pct Leaderboard | |
| This table is a snapshot of the career, single-season, active, and yearly leaders at the end of each season. | |
| * - Indicates Hall of Fame
+ - indicates hit-less at-bats added to meet 502PA requirement. Bold - Indicates active player |
| Year | Career | SLG | Single-Season | SLG | Active | SLG | Yearly | SLG |
| 1884 | Dave Orr | .5079 | Dave Orr | .5079 | ||||
| For questions or to report errors, please send us a note. |