In Baseball, the pitcher is the player who throws the baseball from the Pitcher's mound toward the Catcher to begin each play, with the goal of retiring a batter who attempts to either make contact with it or draw a walk. In the numbering system used to record defensive plays, the pitcher is assigned the number 1.
In most cases, the object of a pitch is to deliver the ball to the catcher without allowing the Batter to hit the ball. The ball is delivered in such a way that the batter either can't hit a pitch through the Strike zone or is compelled to swing at a pitch outside of the strike zone. If the batter elects not to swing at the pitch, it is called a strike if the ball passes through the strike zone and a ball otherwise.
Nearly all action during a game is centered around the pitcher for the defensive team. A pitcher's particular style and skill heavily influences the dynamics of the game and will often determine the victor.
The type and sequence of pitches chosen depends upon the particular situation in a game. Because pitchers and catchers must coordinate each pitch, a system of hand signals are used by the catcher to communicate choices to the pitcher, to which the pitcher either vetoes or accepts.
Keeping a foot on the pitcher's rubber at the center of the pitcher's mound, which is 60 feet 6 inches from home plate, the pitcher throws the baseball to the Catcher, who is positioned behind home plate and catches the ball. Meanwhile, a Batter stands in the Batter's box at one side of the plate, and attempts to bat the ball safely into fair play.
Although the object and mechanics of pitching remain the same for all pitchers, pitchers may be classified according to their roles and effectiveness. The Starting pitcher begins the game and he may be followed various relief pitchers, such as the long reliever, the Left-handed specialist, the setup man, and/or the closer.
Famous past Major League Baseball pitchers include Cy Young, Christy Mathewson, Walter Johnson, Sandy Koufax, Steve Carlton, and Nolan Ryan. Famous current pitchers (as of 2004) include Roger Clemens, Randy Johnson, Greg Maddux, Johan Santana, and Pedro Martinez.
Teams have devised two strategies to address this problem: rotation and specialization. To accommodate playing nearly every day, a team will include a group of pitchers who start games and rotate between them, allowing each pitcher to rest for a few days between starts. Also, teams have additional pitchers reserved to replace that game's starting pitcher if he tires or proves ineffective. These players are called relief pitchers, relievers, or collectively the Bullpen. The relief pitchers often have even more specialized roles, and the particular reliever used depends on the situation. Many teams designate one pitcher as the closer, a relief pitcher specifically reserved to pitch the final inning or innings of a game when his team has a narrow lead, in order to preserve the victory. Generally, relief pitchers pitch fewer innings and throw fewer pitches than starting pitchers, but may be able to pitch more frequently without needing multiple days to recover.
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A skilled pitcher often throws a variety of different pitches in order 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 of over 100 miles per hour (160 km/h). Other common types of pitches are the Curveball, Slider, Changeup, Forkball, split-fingered fastball, 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. (See List of baseball pitches.) A pitcher who is throwing well on a particular day is said to have brought his "good stuff".
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| Baseball positions | |||
|---|---|---|---|
| Outfielders: | [image] | Left field | Center field | Right field | |
| Infielders: | 3rd base | Shortstop | 2nd base | 1st base | ||
| Pitcher | Catcher | Designated hitter | ||