The modern-day baseball came into play in 1976 when balls were no longer made with horsehide – a change from the beginning of the game. ... Umpires pull balls out of play after they've been hit or landed in the dirt a few times to maintain the integrity of the ball and keep the game fair.
A rash of rule changes announced last week by Major League Baseball included several intended to keep things moving. The most controversial: Beginning in 2020, relief pitchers must face at least three batters unless the side is retired or an injury occurs. This being baseball, opposition has been fierce
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https://blastmotion.com/blog/evolution-of-sport-baseball/#testsimplebot
