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Cincinnati Reds outfielder Adam Dunn strikes out swinging. Swinging strikeout.jpg
Cincinnati Reds outfielder Adam Dunn strikes out swinging.

In baseball or softball, a strikeout (or strike-out) occurs when a batter racks up three strikes during a time at bat. It usually means the batter is out. A strikeout is a statistic recorded for both pitchers and batters, and is denoted by K. A "strikeout looking"—in which the batter does not swing and the third strike is called by the umpire—is usually denoted by a . [1]


Although a strikeout suggests that the pitcher dominated the batter, the free-swinging style that generates home runs also leaves batters susceptible to striking out. Some of the greatest home run hitters of all time—such as Alex Rodriguez, Reggie Jackson, and Jim Thome—were notorious for striking out.


A pitched ball is ruled a ball by the umpire if the batter did not swing at it and, in that umpire's judgement, it does not pass through the strike zone. Any pitch at which the batter swings unsuccessfully or, that in that umpire's judgement passes through the strike zone, is ruled a strike. Each ball and strike affects the count, which is incremented for each pitched ball with the exception of a foul ball on any count with two strikes. That is, a third strike may only occur by the batter swinging and missing at a pitched ball, or the pitched ball being ruled a strike by the umpire with no swing by the batter. A pitched ball that is struck by the batter with the bat on any count, and is not a foul ball or foul tip, is in play. A batter may also strike out by bunting, even if the ball is hit into foul territory.

A pitcher receives credit for (and a batter is charged with) a strikeout on any third strike, but a batter is out only if one of the following is true:

  1. The third strike is pitched and caught in flight by the catcher (including foul tips);
  2. On any third strike, if a baserunner is on first and there are zero or one outs;
  3. The third strike is bunted foul and is not caught by a fielder.

Thus, it is possible for a batter to strike out, but still become a runner and reach base safely if the catcher is unable to catch the third strike cleanly, and he then does not either tag out the batter or force him out at first base. In Japan, this is called furinige (振り逃げ), or "swing and escape". In Major League Baseball, it is known as an uncaught third strike. When this happens, a strikeout is recorded for both the pitcher and the batter, but no out is recorded. Because of this, a pitcher may occasionally be able to record more than three strikeouts in one half-inning.

It is also possible for a strikeout to result in a fielder's choice. With the bases loaded and two strikes with two outs, the catcher drops the ball or catches it on the bounce. The batter-runner is obliged to run for first base and other base-runners are obliged to attempt to advance one base. Should the catcher field the ball and step on home plate before the runner from third base can score, then the runner from third base is forced out.

In baseball scorekeeping, a swinging strikeout is recorded as a K, or a K-S. A strikeout looking (where the batter does not swing at a pitch that the umpire then calls strike three) is often scored with a backwards K (), and sometimes as a K-L, CK, or Kc (the 'c' for 'called' strike). In terms of game play, swinging and looking strikeouts are exactly equivalent; the difference in notation is simply to record this aspect of the time at bat. Despite the scorekeeping custom of using "K" for strikeout, "SO" is the official abbreviation used by Major League Baseball. [2]

"K" is still commonly used by fans and enthusiasts for purposes other than official record-keeping. One baseball ritual involves fans attaching a succession of small "K" signs to the nearest railing, one added for every strikeout notched by the home team's pitcher, following a tradition started by New York Mets fans in honor of "Dr. K", Dwight Gooden. The "K" may be placed backwards () in cases where the batter strikes out looking, just as it would appear on a scorecard. Virtually every televised display of a high-strikeout major league game will include a shot of a fan's strikeout display, and if the pitcher continues to strike out batters, the display may be shown following every strikeout.

The use of "K" for a strikeout was invented by Henry Chadwick, a newspaper journalist who is widely credited as the originator of the box score and the baseball scorecard. As is true in much of baseball, both the box score and scorecard remain largely unchanged to this day. Chadwick decided to use "K", the last letter in "struck", since the letter "S" was used for "sacrifice". Chadwick was responsible for several other scorekeeping conventions, including the use of numbers to designate player positions. [3]

Those unaware of Chadwick's contributions have speculated that "K" was derived from the last name of 19th century pitcher Matt Kilroy. If not for the evidence supporting Chadwick's earlier use of "K", this explanation would be reasonable. Kilroy raised the prominence of the strikeout, setting an all-time single-season record of 513 strikeouts in 1886, only two years after overhand pitching was permitted. His record, however, is limited to its era since the pitcher's mound was only 50 feet (15 m) from the batter during that season. It was moved to its current distance of 60'6" in 1893. The modern record (1901–present) is 383 strikeouts, held by Nolan Ryan, one better than Sandy Koufax's 382.

For 55 years, Walter Johnson held the career strikeout record, at 3,508. That record fell in 1982 to Nolan Ryan, who was then passed by Steve Carlton, before Ryan took the career strikeout record for good at 5,714.


Early rules stated that "three balls being struck at and missed and the last one caught, is a hand-out; if not caught is considered fair, and the striker bound to run." The modern rule has changed very little. The addition of the called strike came in 1858.

In 1880, the rules were changed to specify that a third strike had to be caught on the fly. A later adjustment to the dropped third strike rule specified that a batter is automatically out when there are fewer than two out and a runner on first base. In 1887, the number of strikes for an out was changed to four, but it was promptly changed back to three the next season.

Jargon and slang

Hall of Famer Sandy Koufax Sandy Koufax.jpg
Hall of Famer Sandy Koufax

A swinging strikeout is often called a whiff , while a batter who is struck out by a fastball is often said to have been blown away. A batter who strikes out on a swung third strike is said to have fanned (as in a fanning motion), whereas if he takes a called third strike it is called a punchout (describing the plate umpire's dramatic punching motion on a called third strike). However, sometimes these words are used as general synonyms for a strikeout, irrespective of whether it was swinging or looking. The announcer Ernie Harwell called a batter who took a called third strike, usually on the other team, "out for excessive window-shopping" or having "stood like the house by the side of the road".

On a called third strike, it is said that the batter was caught looking, or that he looked at a strike. Typically, a called third strike can be somewhat more embarrassing for a batter, as it shows that he was either fooled by the pitcher or, even worse, had a moment of hesitation.

For example, Carlos Beltrán was caught looking at strike 3 to end the 2006 NLCS, and the season, for the New York Mets. Sports commentators have also been known to refer to it as browsing if the batter did not move his bat at all.

A pitcher is said to strike out the side when he retires all three batters in a half-inning by striking them out. This term is also used when all three outs were caused by strike outs, regardless of how other batters in the inning fared. If a pitcher strikes out three batters on nine pitches, he is said to have pitched an immaculate inning . A batter that takes the third strike looking, especially on a breaking pitch like a slider or a curveball that appears to be out of the strike zone but drops in before he can get the bat off his shoulders, can be said to have been frozen.

In slang, when a batter strikes out three times in a game, he is said to have completed a hat trick . If he strikes out four times, it is called a golden sombrero . He receives a platinum sombrero if he strikes out five times, and this dishonor is also known as the Olympic Rings .

Striking out six times is a rare occurrence, which in the history of major league play has only occurred in games that went to extra innings, with Sam Horn of the Baltimore Orioles being one of the few to do this. The slugger's then-teammate, pitcher Mike Flanagan, told reporters after that 1991 event that six strikeouts would thereafter be known as a Horn. He added that if anyone ever strikes out seven times in one game, it will be a Horn of Plenty.

Detroit Tigers fan keep track of their starting pitcher's strikeouts during a game in 2010, with each 'K' representing one strikeout StrikeoutsByFans.jpg
Detroit Tigers fan keep track of their starting pitcher's strikeouts during a game in 2010, with each 'K' representing one strikeout

Some pitchers who specialize in strikeouts have acquired nicknames including the letter "K". Dwight Gooden was known as "Doctor K" (back-referencing basketball star Julius Erving a.k.a. "Dr. J"). Francisco Rodríguez is known as "K-Rod". [4] Roger Clemens has taken the "K" name to an extreme by naming his four sons Koby, Kory, Kacy, and Kody. Tim Lincecum is nicknamed "The Say 'K' Kid", referencing former Giants player Willie Mays who was called "The Say Hey Kid". Daisuke Matsuzaka is known as "Dice-K", a term which was used as a pronunciation guide for his name when he first arrived in MLB.

Hall of Fame strikeout artist Sandy Koufax of the Los Angeles Dodgers coincidentally has a last name starting with "K", and in his call of the pitcher's perfect game in 1965, Dodgers announcer Vin Scully commented that Koufax's name "will always remind you of strikeouts". [5]

More than three strikeouts in an inning

The batter attempting to advance to first base after an uncaught third strike, which the catcher has already retrieved and is about to throw to the first baseman to record the putout Kalish Leaves the Box (3802058047).jpg
The batter attempting to advance to first base after an uncaught third strike, which the catcher has already retrieved and is about to throw to the first baseman to record the putout

If a third strike is not caught cleanly by the catcher, it is still recorded as a strikeout for both the pitcher and the batter, but the batter becomes a runner and the play is still alive. (This is not true when first base is occupied and there are fewer than two outs; see Uncaught third strike.) [6] The runner may take first base unless the defense tags or throws him out. Therefore, a pitcher can achieve more than three strikeouts in one standard half-inning.

Prior to 1960, the event occurred only seven times. [7] The first Major League player to be credited with the feat was Ed "Cannonball" Crane of the New York Giants on October 4, 1888. [8] It has occurred in Major League Baseball 76 times. [9] [10] Chuck Finley accomplished the feat on May 12 and August 15, 1999, with the Anaheim Angels and again on April 16, 2000, with the Cleveland Indians. Pete Richert of the Los Angeles Dodgers is the only pitcher to do it in his MLB debut (April 12, 1962, against the Cincinnati Reds). [11] Steve Delabar struck out four men in the 10th inning, and recorded the win in a 3–2 victory over the Chicago White Sox on August 13, 2012, making him the first pitcher in major league history to record four strikeouts in an extra inning. [12]

For a list of pitchers who have achieved more than three strikeouts in an inning, including the most recent pitcher to do so, see List of Major League Baseball single-inning strikeout leaders.

Five strikeouts in one inning have never occurred in a regulation Major League Baseball game. They have occurred at least six times at the minor league level. John Perkovitsh of Wisconsin Rapids did so against Oshkosh in a Wisconsin State League game on May 17, 1946, while Ron Necciai of Bristol in the Appalachian League accomplished the feat against Johnson City on May 17, 1952. Kelly Wunsch of the Beloit Brewers fanned five in the third inning on April 15, 1994. [13] Mike Schultz of the Lancaster JetHawks struck out five batters in one inning on July 16, 2004, and Garrett Bauer of the Rockford RiverHawks struck out five batters in one inning on July 1, 2008. [14] Most recently, Malcolm Van Buren of the Burlington Royals struck out five in the seventh inning of a game on July 31, 2019. [15] That this has never happened in Major League play reflects the rarity of a pitcher getting a strikeout with an uncaught third strike, but also that,

  1. a second uncaught third strike happens with two outs, whether or not a runner is on first base and that the batter safely reaches first base, or
  2. that with fewer than two outs, the first baserunner, who reached base on an uncaught third strike, must have scored or be on a base other than first before another strikeout with a dropped 3rd strike can occur. Alternately, one or two normal strikeouts must be recorded before the second runner can possibly reach first base on a dropped 3rd strike; only when the second batter-runner reaches base can the 5th strikeout be completed.

Houston Astros pitcher Joe Niekro struck out five Minnesota Twins batters in the first inning of an exhibition spring training game [16] on April 7, 1976, in New Orleans. Niekro's catcher, Cliff Johnson, was charged with five passed balls in the inning. [17] Exhibition games are not recorded in official statistics.



An electronic banner announcing the milestone achievement of John Smoltz recording his 3000th strikeout during a game in April 2008 John Smoltz 3000 strikeouts.jpg
An electronic banner announcing the milestone achievement of John Smoltz recording his 3000th strikeout during a game in April 2008

The top 20 Major League Baseball career strikeout leaders (active players in bold) (since 1901): [18]

  1. Nolan Ryan – 5,714
  2. Randy Johnson – 4,875
  3. Roger Clemens – 4,672
  4. Steve Carlton – 4,136
  5. Bert Blyleven – 3,701
  6. Tom Seaver – 3,640
  7. Don Sutton – 3,574
  8. Gaylord Perry – 3,534
  9. Walter Johnson – 3,509
  10. Greg Maddux – 3,371
  11. Phil Niekro – 3,342
  12. Ferguson Jenkins – 3,192
  13. Pedro Martínez – 3,154
  14. Bob Gibson – 3,117
  15. Curt Schilling – 3,116
  16. CC Sabathia – 3,093
  17. John Smoltz – 3,084
  18. Justin Verlander – 3,006
  19. Jim Bunning – 2,855
  20. Mickey Lolich – 2,832

Active pitchers with over 2,000 strikeouts (as of completion of the 2019 Major League Baseball season): [19]

  1. Justin Verlander – 3,006
  2. Max Scherzer – 2,692
  3. Zack Greinke – 2,622
  4. Cole Hamels – 2,558
  5. Bartolo Colón – 2,535
  6. Félix Hernández – 2,524
  7. Clayton Kershaw – 2,464
  8. Jon Lester – 2,355
  9. Chris Sale – 2,007

The top 10 Major League Baseball career strikeout-per-nine innings leaders (since 1900, minimum 1,000 IP): [20]

  1. Yu Darvish – 11.12
  2. Chris Sale – 11.08
  3. Randy Johnson – 10.61
  4. Stephen Strasburg – 10.59
  5. Max Scherzer – 10.57
  6. Kerry Wood – 10.32
  7. Jacob deGrom – 10.26
  8. Pedro Martínez – 10.04
  9. Gerrit Cole – 9.98
  10. Chris Archer – 9.83

The top 5 Major League Baseball single-season strikeout-per-nine innings leaders (since 1900, minimum 1.0 IP per team game): [21]

  1. Randy Johnson, 2001 – 13.41
  2. Pedro Martínez, 1999 – 13.20
  3. Chris Sale , 2017 – 12.93
  4. Kerry Wood, 1998 – 12.58
  5. Randy Johnson, 2000 – 12.56

The top 10 Major League Baseball single-season strikeout totals (since 1900): [22]

PitcherStrikeoutsSeasonTeamLeagueOverall Rank
Nolan Ryan3831973California AngelsAL8
Sandy Koufax3821965Los Angeles DodgersNL9
Randy Johnson3722001Arizona DiamondbacksNL11
Nolan Ryan3671974California AngelsAL14
Randy Johnson3641999Arizona DiamondbacksNL15
Rube Waddell3491904Philadelphia AthleticsAL18
Bob Feller3481946Cleveland IndiansAL19
Randy Johnson3472000Arizona DiamondbacksNL20
Nolan Ryan3411977California AngelsAL25
Randy Johnson3342002Arizona DiamondbacksNL30

The top 10 Major League Baseball single-season strikeout totals (all time): [23]

PitcherStrikeoutsSeasonTeamLeagueOverall Rank
Matt Kilroy 5131886 Baltimore Orioles AA 1
Toad Ramsey 4991886 Louisville Colonels AA2
Hugh Daily 4831884 Chicago Browns/Pittsburgh Stogies/Washington Nationals UA 3
Dupee Shaw 4511884 Detroit Wolverines/Boston Reds NL/UA4
Old Hoss Radbourn 4411884 Providence Grays NL5
Charlie Buffington 4171884 Boston Beaneaters Da6
Guy Hecker 3851884 Louisville Eclipse AA7
Nolan Ryan3831973California AngelsAL8
Sandy Koufax3821965Los Angeles DodgersNL9
Bill Sweeney 3741884 Baltimore Monumentals UA10

Progression of major league strikeout record for one nine-inning game, regular season (partial listing):

Modern era:

Note: Tom Cheney struck out 21 batters overall, in a 16-inning game, September 12, 1962. [27] He had 13 strikeouts through the first nine innings.

Progression of strikeout record for one game, World Series:

Progression of major league strikeout record for a relief pitcher, regular season (partial listing): [29]


The top 15 Major League Baseball career strikeout leaders (as of completion of the 2019 Major League Baseball season):

  1. Reggie Jackson – 2,597
  2. Jim Thome – 2,548
  3. Adam Dunn – 2,379
  4. Sammy Sosa – 2,306
  5. Alex Rodriguez – 2,287
  6. Andrés Galarraga – 2,003
  7. José Canseco – 1,942
  8. Willie Stargell – 1,936
  9. Mark Reynolds – 1,927
  10. Curtis Granderson – 1,916
  11. Mike Cameron – 1,901
  12. Mike Schmidt – 1,883
  13. Fred McGriff – 1,882
  14. Tony Pérez – 1,867
  15. Ryan Howard – 1,843

Active batters with over 1,400 K's (as of completion of the 2019 Major League Baseball season):

  1. Chris Davis – 1,835
  2. Justin Upton – 1,798
  3. Miguel Cabrera – 1,761
  4. Matt Kemp – 1,600
  5. Nelson Cruz – 1,567
  6. Shin-Soo Choo – 1,546
  7. Jay Bruce – 1,535
  8. Alex Gordon – 1,498
  9. Evan Longoria – 1,433
  10. Ian Desmond – 1,402

Single-season strikeout records (batters):

Mark Reynolds Arizona Diamondbacks 2232009
Adam Dunn Chicago White Sox 2222012
Chris Davis Baltimore Orioles 2192016
Yoan Moncada Chicago White Sox 2172018
Chris Carter Houston Astros 2122013
Mark Reynolds Arizona Diamondbacks 2112010
Giancarlo Stanton New York Yankees 2112018
Chris Davis Baltimore Orioles 2082015
Aaron Judge New York Yankees 2082017
Joey Gallo Texas Rangers 2072018


Progression of record for total strikeouts by both teams in one game (partial listing):

See also

Related Research Articles

Baseball statistics play an important role in evaluating the progress of a player or team.

Pedro Martínez Dominican baseball pitcher

Pedro Jaime Martínez is a Dominican former professional baseball starting pitcher, who played in Major League Baseball (MLB) from 1992 to 2009, for five teams—most notably the Boston Red Sox from 1998 to 2004.

Sandy Koufax American baseball player

Sanford Koufax is an American former professional baseball left-handed pitcher. He pitched 12 seasons for the Brooklyn/Los Angeles Dodgers of Major League Baseball (MLB) from 1955 to 1966. Koufax, at age 36 in 1972, became the youngest player ever elected to the Baseball Hall of Fame. He has been hailed as one of the greatest pitchers in baseball history.

Randy Johnson American baseball player

Randall David Johnson, nicknamed "The Big Unit", is an American former professional baseball pitcher who played 22 seasons in Major League Baseball (MLB), from 1988 to 2009, for six teams, primarily the Seattle Mariners and Arizona Diamondbacks. His 303 career victories are the fifth-most by a left-hander in MLB history, while his 4,875 strikeouts place him second all time behind Nolan Ryan and first among left-handers. He holds five of the seven highest single-season strikeout totals by a left-hander in modern history. Johnson was a ten-time All-Star, won the Cy Young Award five times, and is one of only two pitchers to win the award in four consecutive seasons (1999–2002). In 1999, he joined Pedro Martínez and Gaylord Perry in the rare feat of winning the award in both the American and National Leagues. He is also one of five pitchers to pitch no-hitters in both leagues. On May 18, 2004, at the age of 40, Johnson became the oldest pitcher in major league history to throw a perfect game; he is one of seven pitchers to have thrown a perfect game and at least one other no-hitter in their careers. He is also one of 18 pitchers in history to record a win against all 30 MLB franchises. On May 8, 2001, Johnson achieved the feat of striking out 20 batters in a game, against the Cincinnati Reds.

Ron Necciai American baseball player

Ronald Andrew Necciai [neh-chai],, is a former Major League Baseball starting pitcher who played with the Pittsburgh Pirates in the 1952 season. He batted and threw right-handed.

J. R. Richard American baseball player (born 1950)

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Bob Veale American baseball player

Robert Andrew Veale is an American former professional baseball player and coach. He played in Major League Baseball as a left-handed pitcher from 1962 through 1974 for the Pittsburgh Pirates and Boston Red Sox. Veale was one of the top strikeout pitchers in the National League during his tenure with the Pirates. The two-time All-Star player was the National League strikeout leader in 1964. He was a member of the Pirates teams that won three consecutive National League Eastern Division titles between 1970 and 1972 and, won the World Series in 1971. Veale also played for the Boston Red Sox from 1972 to 1974.

Uncaught third strike

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."

Justin Verlander American baseball pitcher

Justin Brooks Verlander is an American professional baseball pitcher for the Houston Astros of Major League Baseball (MLB). He has also played for the Detroit Tigers of MLB. From Manakin-Sabot in Virginia, Verlander attended Old Dominion University (ODU) and played college baseball for the Monarchs. He broke the Monarchs' and Colonial Athletic Association's career records for strikeouts. At the 2003 Pan American Games, Verlander helped lead the United States national team to a silver medal.

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Sandy Koufaxs perfect game

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Clayton Kershaw American baseball player

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Power pitcher

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Max Scherzer American baseball pitcher

Maxwell M. Scherzer, nicknamed “Mad Max”, is an American professional baseball pitcher for the Washington Nationals of Major League Baseball (MLB). He made his MLB debut as a member of the Arizona Diamondbacks in 2008, and later played for the Detroit Tigers, prior to joining the Nationals. He has been an important figure in the both the Tigers' and Nationals' playoff presence, including Detroit's four consecutive American League Central titles from 2011 to 2014 and two of Washington's National League East titles, culminating in winning the 2019 World Series as a Wild Card team. A power pitcher with a low three-quarter-arm delivery, Scherzer has achieved numerous strikeout records and distinctions. He is the tenth pitcher in history to garner at least three Cy Young Awards, the sixth to record two no-hitters in one season, the fifth to produce more than one immaculate inning, and the second to strike out at least 200 batters in a season eight years in a row. He is regarded to be one of the greatest pitchers of all time.


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