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In baseball, the strike zone is the area 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 his 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 does not swing at it. 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.
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, unless the batter already has two strikes. Any pitch not called a strike, swung on and missed, or fouled-off, is a "ball" (originally "no ball").
A batter who accumulates three strikes in a single batting appearance has Strikeout 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 nine balls for a batter to earn a walk. However, to make up for this, he could request the ball to be pitched high, low, or medium.
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Whether or not a pitch was "unfair" or the batter was being unreasonably picky was left entirely to the umpire's judgment. Well into the 1870s, umpires were reluctant to make such calls,"In calling on pitchers, the rule to be observed this season by leading umpires will be as follows: When the game commences, the umpire, after making such allowance for accidental unfair delivery as the circumstances will justify, will without appeal call “ball to the bat,” after which notice should the pitcher fail “repeatedly”, viz., twice or three times to deliver a fair ball, then the umpire will call “one ball;” and if the pitcher persists in such action, that is, delivers one or two unfair balls directly after such warning and calling of one ball, two and three balls are to be called, and the player given his base. Less latitude will be allowed in this matter than was permitted last season, and the practice of taking the opinion of the two nines or their captains as to the degree of latitude to be observed in making allowance for unfair balls is to be entirely done away with." New York Clipper, March 25, 1865 since they were viewed as penalties for unsportsmanlike play. By the 1880s, they had become routine, and the modern view took hold, that every pitch results in either a swing, a ball or a called strike. 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 Home 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.""A Definition", in The Sporting Life, Wednesday, March 17, 1886, p. 1, col. 2. 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."
Major League Baseball has occasionally redefined the strike zone to control the balance of power between pitchers and hitters. After the record home run year by Roger Maris in , 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. In , pitchers such as Denny McLain and Bob Gibson dominated hitters, producing 339 . Carl Yastrzemski was the only American League hitter to finish the season with a batting average higher than .300. 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 consecutive scoreless innings during the 1968 season. As a result of the dropping offensive statistics, Major League Baseball reduced pitchers' advantage by lowering the height of the mound from to , and by reducing the size of the strike zone for the season to extend only from the batter's armpits to the top of the knees. In 1985, the top of the strike zone was lowered to the midpoint of the batter's torso, as viewed from a vertical angle by the umpire.
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 any manager, coach, or player who leaves his dugout or field position to contest a judgment call will first be warned, and then ejected.
Many umpires, players and analysts, including the authors of a University of Nebraska study on the subject, Newswise Social and Behavioral Sciences News | Larger Strike Zone, Drug Testing Reduced Hitting in Baseball Since 2000 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 the zone had changed so much that some pitchers, such as Tom Glavine, had to radically adjust their approach to pitching for strikes. Umpires and totals: Men behind the mask occasionally steal the show In 2003, a frustrated Curt Schilling took a baseball bat to a QuesTec camera and destroyed it after a loss, saying the umpires should not be changing the strike zone to match the machines. D'backs' Schilling fined for destroying QuesTec camera
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. Monitor May Reopen Wounds, an April 2009 article from The New York Times 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. Preview 2009: The umpires' arbiter from an April 2009 Star Tribune article
As of 2022, Minor League Baseball has been testing the Automated Ball-Strike System (ABS) on an experimental basis for several seasons. While the umpire continues to call balls and strikes, ABS determines 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 ABS would eventually be used in Major League games. ESPN reported that all AAA games would use ABS in the 2023 season. 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.
Enforcement
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.
See also
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