For how many pitches is a major league baseball used in its lifetime, on average?
In major league baseball, the balls used are discarded frequently and without a second thought. A baseball may be removed from play for several reasons. The home plate umpire will usually remove a ball that ends up in the dirt. A ball that stays in play after a base hit will most likely undergo inspection before the pitcher uses it again. Many pitchers will ask for a new ball to replace any one that has been hit. A baseball’s total life span, on average, is eight pitches in the modern professional leagues. Source: FoxSports.com