Highest slugging percentage in a Major League Baseball season
- Who
- Josh Gibson
- Where
- United States
- When
- 1937
The highest slugging percentage for an individual player in a single season is .974, achieved by Josh Gibson (USA) while playing in the Negro Leagues for the Homestead Grays in 1937.
On 28 May 2024, Major League Baseball announced that it had integrated Negro Leagues statistics into its records, supplanting the previous mark of .863 by Barry Bonds of the San Francisco Giants in 2001.
A batter's slugging percentage is calculated by dividing the total number of bases gained by the total number of at-bats.