The ball's texture could explain why Yu Darvish and Ken Giles, among others, have struggled with their sliders.
CHICAGO, IL – MAY 11: Jason Heyward #22 of the Chicago Cubs walks off the field after striking out against the San Diego Padres during the ninth inning in game one of a double header at Wrigley Field on May 11, 2016 in Chicago, Illinois. The San Diego Padres won 7-4. (Photo by Jon Durr/Getty Images)