The Philadelphia Phillies had invited 21 non-roster players to spring training in Clearwater, Fla. The number is now 24. The Phillies announced the addition of three catchers: Jack Conley, Aramis ...

Here's what to know about MLB's robot umps. How does the Automated Ball-Strike System work? Stadiums are outfitted with cameras that track each pitch and judge whether it crossed home plate within the ...

Stadiums are outfitted with cameras that track each pitch and judge whether it crossed home plate within the strike zone. In early testing, umpires wore ear buds and would hear “ball” or “strike,” ...