outside the front of the strike zone but curving so as to enter this volume farther back (without being hit) is sometimes called a "back-door strike". Various other rulebooks for baseball and softball define the strike zone slightly differently.

Beginning in 2026, with the introduction of the Automated Ball-Strike System, the MLB strike zone was formally defined as being between 27% and 53.5% of a player's listed height.

A pitch is also a

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