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In baseball, any pitch at which the batter does not swing, and which, in the judgment of the umpire, is not in the strike zone is called a ball. A batter who receives four balls in a plate appearance is entitled to a base on balls (or walk). In very early iterations of the rules, it took 9 balls for a batter to get a walk; however, to make up for this, the batter could request the ball to be pitched high, low, or medium.