Strike Zone
The top of the strike zone is the mid-level between the top of the batter's shoulders and his belt, and the bottom is at the level just beneath the knee cap. The right and left boundaries of the strike zone correspond to the edges of home plate. A pitch at which the batter does not swing and which does not pass through the strike zone is called a ball. Unofficially, the de facto enforced strike zone may be different at any different level.
The strike zone is often illustrated as a two dimensional plane parallel to the front of the plate and perpendicular to the playing surface. If any part of a pitched ball intersects any portion of this plane, the ball is in the strike zone and should be ruled as a strike (unless hit.) Technically, the strike zone has depth as well; the rules define a volume of 3-dimensional space–a right pentagonal prism. If any part of the ball intersects any part of this space, it is considered in the zone, and should be ruled a strike.
A batter who accumulates three strikes in a single batting appearance has struck out and is ruled out (exception, dropped third strike); a batter who accumulates four balls in a single appearance has drawn a base on balls (or "walk") and is awarded first base. In very early iterations of the rules during the 19th century, it took up to 9 balls for a batter to earn a walk; however, to make up for this, the batter could request the ball to be pitched high, low, or medium.
A strike shall be called and added to the batter's count, when he...
Swings at a pitched ball and fails to hit it (swing and miss, strike swinging)
According to MLB Rule 2.00 Definition of Terms, STRIKE (a), a pitch is called a strike if it "[i]s struck at by the batter and is missed". This includes when he:
Attempts to bunt a pitched ball and fails to hit it.
Touches a pitched ball with his body while striking at it with the bat.
Fails to swing at a pitched ball which is called a strike—determined to be in the strike zone—by the umpire. (called strike, strike looking)
Hits a pitched ball into foul territory when there are fewer than two strikes in the at-bat. (foul ball)
Bunts a pitched ball into foul territory. This counts as a foul strike regardless of the number of strikes already charged to the batter.
Touches a pitched ball while it is in the strike zone. (Intentional touching of a pitched ball is not allowed.)
Hits a foul tip; that is, ticks the ball which goes directly to the catcher's glove and is caught.
Refuses to enter the batter's box when ordered to do so by the umpire, and any directed pitch is thrown by the pitcher.
A normal foul strike cannot count against the batter as his third strike; the third strike must be a swing and miss, called strike, touched ball, foul bunt or foul tip.
Source: Wikipedia: http://en.wikipedia.org/wiki/Strike_zone
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