History of Baseball in the United States of Americ
Pitching in a game
A skilled pitcher often throws a variety of different pitches to prevent the batter from hitting the ball well. The most basic pitch is a fastball, where the pitcher throws the ball as hard as he can. Some pitchers are able to throw a fastball at a speed over 100 miles per hour (160 km/h; 150 ft/s), ex., Aroldis Chapman. Other common types of pitches are the curveball, slider, changeup, cutter, sinker, screwball, forkball, split-fingered fastball, slurve, and knuckleball. These generally are intended to have unusual movement or to deceive the batter as to the rotation or velocity of the ball, making it more difficult to hit. Very few pitchers throw all of these pitches, but most use a subset or blend of the basic types. Some pitchers also release pitches from different arm angles, making it harder for the batter to pick up the flight of the ball.
There are a number of distinct throwing styles used by pitchers. The most common style is a three-quarters delivery in which the pitcher's arm snaps downward with the release of the ball. Some pitchers use a sidearm delivery in which the arm arcs laterally to the torso. Some pitchers use a submarine style in which the pitcher's body tilts sharply downward on delivery, creating an exaggerated sidearm motion in which the pitcher's knuckles come very close to the mound.
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