alt Hacker NewsImagine the strike zone was just convention and pitchers were technically allowed to roll the ball if they were more bothered about preventing home runs than getting the opponent out. Think your baseball mind would be annoyed when someone did it, and the lawmakers would have to step in pretty quick to stop it being a regular thing...
(Think there's also a general prejudice against underarm play in professional sport as it's for kids who can't throw properly and feels like mockery. Underarm serves in tennis are frowned upon, even though an alert opponent has plenty of chance of scoring a point from them)
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Watch softball sometime.
I mean this does exist in baseball, kinda, but there’s incentive to not do so since it gets the opposing team closer to scoring: https://www.mlb.com/glossary/standard-stats/intentional-walk
I don't think there's a rule against rolling the ball to a batter; it would be called a ball. It would be similar to a wild pitch or an intentional walk (when you had to actually throw the 4 balls).