In baseball, the strike zone is the volume of space through which a pitch must pass in order to be called a strike even if the batter does not swing. The strike zone is defined as the volume of space above home plate and between the batter's knees and the midpoint of their torso. Whether a pitch passes through the zone is decided by an umpire, who is generally positioned behind the catcher.
Strikes are desirable for the pitcher and the fielding team, as three strikes result in a strikeout of that batter. A pitch that misses the strike zone is called a ball if the batter doesn't swing. Balls are desirable for the batter and the batting team, as four balls allow the batter to take a "walk" to first base as a base on balls.
The strike zone is a volume of space, a vertical right pentagonal prism. Its sides are vertical planes extending up from the edges of home plate. In Major League Baseball, the top of the strike zone is the midpoint between the top of the batter's shoulders and the top of the uniform pants, and the bottom of the strike zone is at the hollow beneath the kneecap, both determined from the batter's stance as the batter is prepared to swing at the pitched ball. Various rulebooks for baseball and softball define the strike zone slightly differently.
(A pitch is also a strike if the batter swings or offers the bat in an attempt to hit the pitch. A pitch batted into foul territory—a foul ball—is also a strike, subject to various exceptions.) A pitch that is not a strike is called a ball (short for "no ball"). The active tally of strikes and balls during a player's turn at bat is called the count.
Although the de facto enforced strike zone can vary, the Official Rules (Definitions of Terms, STRIKE (b)) define a pitch as a strike "if any part of the ball passes through any part of the strike zone", with the ball required to have not bounced. Thus, a pitch that touches the outer boundary of the zone is as much a strike as a pitch that is thrown right down the center. A pitch passing outside the front of the strike zone but curving so as to enter this volume farther back (without being hit) is sometimes called a "back-door strike".
A batter who accumulates three strikes in a single batting appearance has struck out and is ruled out (with the exception of an uncaught third strike); a batter who accumulates four balls in a single appearance has drawn a base on balls (or walk) and is awarded advancement to 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. [1]
Originally, the word "strike" was used literally: the batter striking at the ball in an effort to hit it. For example, the 11th rule of the Knickerbocker Rules (1845) read "Three balls being struck at and missed and the last one caught, is a hand-out." There was no adverse consequence if the batter chose not to swing, i.e. the called strike did not exist, the result being batters prepared to wait all day for "their" pitch. It was not until the 1858 NABBP convention that a rule was adopted authorizing the umpire to impose a penalty strike for such conduct: "Should a striker stand at the bat without striking at good balls repeatedly pitched to him, for the purpose of delaying the game or of giving advantage to a player, the umpire, after warning him, shall call one strike, and if he persists in such action, two and three strikes. When three strikes are called, he shall be subject to the same rules as if he had struck at three balls." [2] The called ball first appeared in the rules of 1863, similarly as a discretionary penalty imposed on the pitcher for persistently delivering "unfair" balls. [3]
Whether or not a pitch was "unfair," or the batter was being unreasonably picky, was a matter left entirely to the umpire's judgment; well into the 1870s umpires were reluctant to make such calls, [4] since they were viewed as penalties for unsportsmanlike play. But by the 1880s they had become routine, and the modern view according to which every pitch results in either a swing, a ball or a called strike had taken hold. The first rule leading to the creation of a defined strike zone was enacted by the American Association before the 1886 season. As explained in The Sporting Life on March 17, 1886, "the ball must be delivered at the height called for by the batsman. If at such height it passes over any part of the plate then it is a strike. The idea is to give the pitcher a chance against some cranky umpires who compelled the twirlers to almost cut the plate in two before a strike would be called, even if the height was right." [5] The following year, the National League created the full strike zone, eliminating the batter's right to call the height of the pitch, and instead requiring the umpire to call a strike on any pitch that "passes over home plate not lower than the batsman's knee, nor higher than his shoulders." [6]
Major League Baseball has occasionally increased or reduced the size of the strike zone in an attempt to control the balance of power between pitchers and hitters. [7] After the record home run year by Roger Maris in 1961, the major leagues increased the size of the strike zone by raising the top of the zone from the batter's armpit to the top of his shoulder. [8] [9] In 1968, pitchers such as Denny McLain and Bob Gibson among others dominated hitters, producing 339 shutouts. [7] Carl Yastrzemski would be the only American League hitter to finish the season with a batting average higher than .300. [7] In the National League, Gibson posted a 1.12 earned run average, the lowest in 54 years, while Los Angeles Dodgers pitcher Don Drysdale threw a record 58 and two-thirds consecutive scoreless innings during the 1968 season. [7] As a result of the dropping offensive statistics, Major League Baseball took steps to reduce the advantage held by pitchers by lowering the height of the pitcher's mound from 15 inches to 10 inches, and by reducing the size of the strike zone for the 1969 season to extend only from the batter's armpits to the top of his knees. [8] [10]
While baseball rules provide a precise definition for the strike zone, in practice, it is up to the judgment of the umpire to decide whether the pitch passed through the zone.
The Official Baseball Rules (Rule 8.02(a), including Comment) state that objections to judgment calls on the field, including balls and strikes, shall not be tolerated, and that any manager, coach, or player who leaves his dugout or field position to contest a judgment call will first be warned, and then ejected. [11]
Many umpires, players and analysts, including the authors of a University of Nebraska study on the subject, [12] believe that due to the QuesTec pitch-tracking system, the enforced strike zone in 2002–2006 was larger compared to the zone in 1996–2000 and thus closer to the rulebook definition. Some commentators believed that the zone had changed so much that some pitchers, such as Tom Glavine, had to radically adjust their approach to pitching for strikes. [13] In 2003, a frustrated Curt Schilling took a baseball bat to a QuesTec camera and destroyed it after a loss, saying the umpires shouldn't be changing the strike zone to match the machines. [14]
In 2009, a new system called Zone Evaluation was implemented in all 30 Major League ballparks, replacing the QuesTec system; the new system records the ball's position in flight more than 20 times before it reaches home plate. [15] Much of the early resistance from Major League umpires to QuesTec had diminished and the implementation of the new Zone Evaluation system in all the parks went largely unmentioned to fans. Like the old system, the new system will be used to grade umpires on accuracy and used to determine which umpires receive postseason assignments, but games themselves are still subject to their error. [16]
As of 2022, Minor league baseball had used Automated Balls and Strikes on an experimental basis for several seasons. While the umpire continued to call balls and strikes, an automated system determined the strike zone and could be used when a team challenged the umpire's call. Major League Baseball commissioner Rob Manfred said in October 2022 that this method would eventually be used in Major League games. ESPN reported that all AAA games would use the method in the 2023 season. [17] [18] For 2023, the system was used for half of all games, with the other half using umpires, with ABS used for up to three challenges per team for each game. [19]
A base on balls (BB), also known as a walk, occurs in baseball when a batter receives four pitches during a plate appearance that the umpire calls balls, and is in turn awarded first base without the possibility of being called out. The base on balls is defined in Section 2.00 of baseball's Official Rules, and further detail is given in 6.08(a). Despite being known as a "walk", it is considered a faux pas for a professional player to literally walk to first base; the batter-runner and any advancing runners normally jog on such a play.
In baseball, hit by pitch (HBP) is an event in which a batter or his clothing or equipment is struck directly by a pitch from the pitcher; the batter is called a hit batsman (HB). A hit batsman is awarded first base, provided that he made an honest effort to avoid the pitch, although failure to do so is rarely called by an umpire. Being hit by a pitch is often caused by a batter standing too close to, or "crowding", home plate.
Softball is a game similar to baseball played with a larger ball on a smaller field, with only underhand pitches permitted. Softball is played competitively at club levels, the college level, and the professional level. The game was first created in 1887 in Chicago by George Hancock.
In baseball or softball, a strikeout occurs when a batter accumulates three strikes during a time at bat. It usually means that the batter is out. A strikeout is a statistic recorded for both pitchers and batters, and is denoted by K in scorekeeping and statistics. A "strikeout looking" — in which the batter does not swing and the third strike is called by the umpire — is usually denoted by a ꓘ.
Catcher is a position in baseball and softball. When a batter takes their turn to hit, the catcher crouches behind home plate, in front of the (home) umpire, and receives the ball from the pitcher. In addition to this primary duty, the catcher is also called upon to master many other skills in order to field the position well. The role of the catcher is similar to that of the wicket-keeper in cricket.
In baseball, an intentional base on balls, usually referred to as an intentional walk and denoted in baseball scorekeeping by IBB, is a walk issued to a batter by a pitcher with the intent of removing the batter's opportunity to swing at the pitched ball. A pitch that is intentionally thrown far outside the strike zone for this purpose is referred to as an intentional ball.
In baseball and softball, the count refers to the number of balls and strikes a batter has in their current plate appearance. If the count reaches three strikes, the batter strikes out; if the count reaches four balls, the batter earns a base on balls.
In baseball, a foul ball is a batted ball that:
In baseball, an out occurs when the umpire rules a batter or baserunner out. When a batter or runner is out, they lose their ability to score a run and must return to the dugout until their next turn at bat. When three outs are recorded in a half-inning, the batting team's turn expires.
Throughout the history of baseball the rules have frequently changed as the game has continued to evolve. The rules of baseball can vary slightly from league to league, with there being dozens of leagues worldwide. A few common rules most professional leagues have in common is that 4 balls is a Base on balls, 3 strikes is a strikeout and 3 outs ends a half inning. One example of differing rules in professional leagues is in Major League Baseball a pitch clock is in place to speed up the pace of the game by forcing pitchers to pitch in a 15-20 second window, where in the Nippon Professional Baseball League no such rule exists.
A baseball field, also called a ball field or baseball diamond, is the field upon which the game of baseball is played. The term can also be used as a metonym for a baseball park. The term sandlot is sometimes used, although this usually refers to less organized venues for activities like sandlot ball.
In the sports of baseball and softball, a batted ball is a pitch that has been contacted by the batter's bat. Batted balls are either fair or foul, and can be characterized as a fly ball, pop-up, line drive, or ground ball. In baseball, a foul ball counts as a strike against the batter, unless there are already two strikes on the batter, with special rules applying to foul tips and foul bunts. Fly balls are those hit in an arcing manner, with pop-ups being a subset of foul balls that do not travel far. Line drives are batted balls hit on a straight line trajectory, while ground balls are hit at a low trajectory, contact the ground shortly after being hit, and then either roll or bounce. Batted balls, especially line drives, can present a hazard to players, umpires, and spectators, as people have been seriously injured or killed after being struck by batted balls.
A ground rule double is a baseball rule that awards two bases from the time of pitch to all baserunners including the batter-runner, as a result of the ball leaving play after being hit fairly and leaving the field under a condition of the ground rules in effect at the field where the game is being played. An automatic double is the term used to refer to a fairly hit ball leaving the field in circumstances that do not merit a home run, such as when the ball's first bounce was within the field. The automatic double is quite often mistakenly called a ground rule double.
QuesTec was a digital media company that pioneered virtual replay from real-time measurement data for baseball and tennis. Years before competitors introduced similar products, QuesTec had established a reputation for accuracy and reliability. Although originally based on internally developed technology, in 1998 QuesTec moved to tracking technology provided by engineers at the Atlantic Aerospace Electronics Corporation. QuesTec is best known for its Umpire Information System (UIS), used by Major League Baseball for the purpose of providing feedback and evaluation of Major League umpires.
The Knickerbocker Rules are a set of baseball rules formalized by William R. Wheaton and William H. Tucker of the Knickerbocker Base Ball Club in 1845. They have previously been considered to be the basis for the rules of the modern game, although this is disputed. The rules are informally known as the "New York style" of baseball, as opposed to other variants such as the "Massachusetts Game" and "Philadelphia town ball".
In baseball and softball, an uncaught third strike occurs when the catcher fails to cleanly catch a pitch for the third strike of a plate appearance. In Major League Baseball (MLB), the specific rules concerning the uncaught third strike are addressed in Rules 5.05 and 5.09 of the Official Baseball Rules: This is one of the oldest rules in modern baseball, dating at least to the Knickerbocker Rules of 1845: "Three balls being struck at and missed and the last one caught, is a hand-out."
This is an alphabetical list of selected unofficial and specialized terms, phrases, and other jargon used in baseball, along with their definitions, including illustrative examples for many entries.
John Francis Tumpane is an American Major League Baseball umpire, who wears number 74.