LONDON, CANADA - MARCH 30: A view of the cross-section and inside of an offical major league baseball, which has been cut in half, showing the tightly wound string and yarn and rubber core on March 30, 2016 in London, Canada. (Photo by Tom Szczerbowski/Getty Images)
Last weekend Major League Baseball sent the Detroit Tigers and every other team a memo about minor changes being made to the baseball. The memo was leaked ($) to Eno Sarris and Ken Rosenthal of The Athletic, and then the Associated Press obtained a copy.
According to the AP report:
MLB anticipates the changes will be subtle, and a memo to teams last week cited an independent lab that found the new balls will fly 1 to 2 feet shorter when hit over 375 feet.