Screwball
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A screwball is a baseball pitch that is thrown so as to break in the opposite direction of a curveball. Thrown by a right-handed pitcher, a screwball breaks from left to right from the point of view of the pitcher. The pitch therefore moves in on a right-handed batter and away from a left-handed batter. Thrown by a left-handed pitcher, a screwball breaks from from right to left, moving in on a left-handed batter and away from a right-handed batter.
The screwball has become increasingly rare because it involves an awkward arm motion that is both difficult to master and demanding on the arm, requiring a violent snap of the wrist as the ball is released. Very few Major League pitchers throw a screwball; many now throw a changeup that emulates the pitch's movement, however.
Carl Hubbell was known as the "scroogie king"; other notable screwball artists include Cy Young award winners Mike Cuellar and Fernando Valenzuela.