MLB Single-Season Slugging Percentage Record Progression
Every season that raised the bar, and the leader in every season between.
The MLB single-season slugging percentage record is .974, set by Josh Gibson in 1937. It has stood for 88 years. The mark has been raised 3 times since 1871.
Record Holders
4 marks since 1871| Year | Player | SLG | Stood for |
|---|---|---|---|
| 1937 | Josh Gibson | .974 | still standing |
| 1926 | Mule Suttles | .877 | 11 years |
| 1920 |
 Babe Ruth
|
.849 | 6 years |
| 1871 | Levi Meyerle | .700 | 49 years |
The earliest marks here are records only in the sense that nobody had done better yet. Season length, schedule and the rules themselves have all changed, so a figure from the 1870s is not comparable with a modern one and is not offered as though it were.