Sticky Baseballs: The Physics of Major League Baseball’s Latest Scandal

Close-up of a baseball mitt and ball

Cheating in baseball is as old as the game itself, and pitchers’ modifying the ball’s surface is part of that long history. Adding to the lore of cheating is a new scandal involving pitchers who may be applying sticky substances – what players refer to as “sticky stuff” – to baseballs.

Major League hitters are striking out this season nearly one in every four times they step to the plate, compared with one in six times in 2005.

As a sports physicist and longtime baseball fan, I’ve been intrigued by news reports that applying sticky substances to balls can make pitches spin faster. And if pitchers can throw their fastballs, curveballs and sliders with more spin than in previous years, their pitches will be tougher to hit. How does science explain all this?

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