baseball Baseball is a bat-and-ball sport played between two teams of nine players each, taking turns batting and fielding. The game occurs over the course of several plays, with each play generally beginning when a player on the fielding tea ...

, the

strikeout In baseball or softball, a strikeout (or strike-out) 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 deno ...

is a

statistic A statistic (singular) or sample statistic is any quantity computed from values in a sample which is considered for a statistical purpose. Statistical purposes include estimating a population parameter, describing a sample, or evaluating a hypo ...

used to evaluate

pitcher In baseball, the pitcher is the player who throws ("pitches") 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 the pitched ball or draw ...

s. A pitcher earns a strikeout when he puts out the batter he is facing by throwing a ball through the

strike zone 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 kn ...

, "defined as that area over homeplate ''(sic)'' the upper limit of which is a horizontal line at the midpoint between the top of the shoulders and the top of the uniform pants, and the lower level is a line at the hollow beneath the kneecap", which is not put

in play Dead ball is a term in many ball sports in which the ball is deemed temporarily not playable, and no movement may be made with it or the players from their respective positions of significance. Depending on the sport, this event may be quite rout ...

. Strikeouts are awarded in four situations: if the batter is put out on a third strike caught by the catcher (to " strike out swinging" or " strike out looking"); if the pitcher throws a third strike which is not caught with fewer than two

outs 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 ha ...

; if the batter becomes a baserunner on an uncaught third strike; or if the batter bunts the ball into foul territory with two strikes.

Major League Baseball Major League Baseball (MLB) is a professional baseball organization and the oldest major professional sports league in the world. MLB is composed of 30 total teams, divided equally between the National League (NL) and the American League (AL), ...

recognizes the player or players in each league with the most strikeouts each season.

Jim Devlin James Alexander Devlin (June 6, 1849 – October 10, 1883) was an American Major League Baseball player who played mainly as a first baseman early in his career, then as a pitcher in the latter part. He played for three teams during his five ...

led the

National League The National League of Professional Baseball Clubs, known simply as the National League (NL), is the older of two leagues constituting Major League Baseball (MLB) in the United States and Canada, and the world's oldest extant professional team s ...

in its inaugural season of 1876; he threw 122 strikeouts for the

Louisville Grays The Louisville Grays were a 19th-century United States baseball team and charter member of the National League, based in Louisville, Kentucky. They played two seasons, 1876 and 1877, and compiled a record of 65–61. Their home games were a ...

. The American League's first winner was

Hall of Fame A hall, wall, or walk of fame is a list of individuals, achievements, or other entities, usually chosen by a group of electors, to mark their excellence or Wiktionary:fame, fame in their field. In some cases, these halls of fame consist of actu ...

pitcher

Cy Young Denton True "Cy" Young (March 29, 1867 – November 4, 1955) was an American Major League Baseball (MLB) pitcher. Born in Gilmore, Ohio, he worked on his family's farm as a youth before starting his professional baseball career. Young entered th ...

, who captured the

American League Triple Crown In baseball, a player earns a Triple Crown when he leads a league in three specific statistical categories in the same season. The term "Triple Crown" generally refers to the batting achievement of leading a league in batting average, home runs, ...

in 1901 by striking out 158 batters, along with leading the league in wins and

earned run average In baseball statistics, earned run average (ERA) is the average of earned runs allowed by a pitcher per nine innings pitched (i.e. the traditional length of a game). It is determined by dividing the number of earned runs allowed by the number ...

Walter Johnson Walter Perry Johnson (November 6, 1887 – December 10, 1946), nicknamed "Barney" and "The Big Train", was an American professional baseball player and manager. He played his entire 21-year baseball career in Major League Baseball as a right-ha ...

led the American League in strikeouts twelve times during his Hall of Fame career, most among all players. He is followed by

Nolan Ryan Lynn Nolan Ryan Jr. (born January 31, 1947), nicknamed "the Ryan Express", is an American former professional baseball pitcher and sports executive. Over a record 27-year playing career in Major League Baseball (MLB) spanning four decades, Ryan ...

, who captured eleven titles between both leagues (nine in the American League and two in the National League).

Randy Johnson Randall David Johnson (born September 10, 1963), nicknamed "The Big Unit", is an American photographer and former professional baseball pitcher who played 22 seasons in Major League Baseball (1988–2009) for six teams, primarily the Seattle M ...

won nine strikeout titles, five coming with the

Arizona Diamondbacks The Arizona Diamondbacks (colloquially known as the D-backs) are an American professional baseball team based in Phoenix. The Diamondbacks compete in Major League Baseball (MLB) as a member club of the National League (NL) West division. The f ...

. Three players have won seven strikeout championships:

Dazzy Vance Charles Arthur "Dazzy" Vance (March 4, 1891 – February 16, 1961) was an American professional baseball player. He played as a pitcher for five different franchises in Major League Baseball (MLB) in a career that spanned twenty years. Known for ...

, who leads the National League; Bob Feller; and

Lefty Grove Robert Moses "Lefty" Grove (March 6, 1900 – May 22, 1975) was an American professional baseball pitcher. After having success in the minor leagues during the early 1920s, Grove became a star in Major League Baseball with the American League's P ...

Grover Cleveland Alexander Grover Cleveland Alexander (February 26, 1887 – November 4, 1950), nicknamed "Old Pete", was an American Major League Baseball pitcher. He played from 1911 through 1930 for the Philadelphia Phillies, Chicago Cubs, and St. Louis Cardinals. He ...

and

Rube Waddell George Edward Waddell (October 13, 1876 – April 1, 1914) was an American pitcher in Major League Baseball (MLB). A left-hander, he played for 13 years, with the Louisville Colonels, Pittsburgh Pirates, and Chicago Orphans in the National ...

led their league six times, and five-time winners include

Steve Carlton Steven Norman Carlton (born December 22, 1944) is an American former professional baseball player. He played in Major League Baseball as a left-handed pitcher for six different teams from 1965 to 1988, most notably as a member of the Philadelphi ...

Roger Clemens William Roger Clemens (born August 4, 1962), nicknamed "Rocket", is an American former professional baseball pitcher who played 24 seasons in Major League Baseball (MLB), primarily with the Boston Red Sox. Clemens was one of the most dominant pi ...

Sam McDowell Samuel Edward Thomas McDowell (born September 21, 1942), is an American former professional baseball player. He played in Major League Baseball as a starting pitcher from 1961 to 1975, most notably for the Cleveland Indians. A six-time All-Star, ...

Christy Mathewson Christopher Mathewson (August 12, 1880 – October 7, 1925), nicknamed "Big Six", "the Christian Gentleman", "Matty", and "the Gentleman's Hurler", was a Major League Baseball right-handed pitcher, who played 17 seasons with the New York Giant ...

Amos Rusie Amos Wilson Rusie (May 30, 1871 – December 6, 1942), nicknamed "The Hoosier Thunderbolt", was an American right-handed pitcher in Major League Baseball during the late 19th century. He had a 10-season career in the National League (NL), w ...

, and

Tom Seaver George Thomas Seaver (November 17, 1944 – August 31, 2020), nicknamed "Tom Terrific" and "the Franchise", was an American professional baseball pitcher who played 20 seasons in Major League Baseball (MLB). He played for the New York Mets, Cinc ...

. There are several players with a claim to the single-season strikeout record. Among recognized major leagues,

Matt Kilroy Matthew Aloysius "Matches" Kilroy (June 21, 1866 – March 2, 1940) was an American left-handed pitcher in Major League Baseball. In 1886, he had 513 strikeouts, which remains the MLB single-season record. Early life Kilroy was born in Philadel ...

accumulated the highest single-season total, with 513 strikeouts for the

Baltimore Orioles The Baltimore Orioles are an American professional baseball team based in Baltimore. The Orioles compete in Major League Baseball (MLB) as a member club of the American League (AL) American League East, East division. As one of the American L ...

of the

American Association American Association may refer to: Baseball * American Association (1882–1891), a major league active from 1882 to 1891 * American Association (1902–1997), a minor league active from 1902 to 1962 and 1969 to 1997 * American Association of Profe ...

in 1886. However, his name does not appear on Major League Baseball's single-season leaders list, since the American Association was independent of the constituent leagues that currently make up Major League Baseball. Several other players with high totals, including 1886 American Association runner-up

Toad Ramsey Thomas H. "Toad" Ramsey (August 8, 1864 – March 27, 1906) was an American Major League Baseball player who pitched in the majors from to . Ramsey spent his entire career in the American Association, split between two different teams. H ...

(499) and 1884

Union Association The Union Association was a league in Major League Baseball which lasted for just the 1884 season. St. Louis won the pennant and joined the National League the following season. Seven of the twelve teams who were in the Association at some poi ...

leader

Hugh Daily Hugh Daily (July 17, 1847 – after 1923), nicknamed "One Arm" Daily, was an Irish born professional right-handed pitcher who played six seasons, for seven different teams; the Buffalo Bisons, the Cleveland Blues, and the St. Louis Maroons of ...

(483), do not appear either. In the National League, Charles "Old Hoss" Radbourn struck out 441 batters for the

Providence Grays The Providence Grays were a Major League Baseball team based in Providence, Rhode Island who played in the National League from until . The Grays played at the Messer Street Grounds in the Olneyville neighborhood. The team won the National Leagu ...

; however, the Providence franchise folded after the 1885 season and has no successor. Therefore, Major League Baseball recognizes his runner-up from that season,

Charlie Buffinton Charles "Charlie" G. Buffinton (June 14, 1861 – September 23, 1907) was an American right-handed pitcher in Major League Baseball from 1882 to 1892. One of the workhorse pitchers of the 1880s, he won 20 games seven times and his 1,700 career s ...

, as the record-holder with 417 strikeouts. In the American League, Ryan leads with 383 strikeouts in 1973. The largest margin of victory for a champion is 156 strikeouts, achieved in 1883 when

Tim Keefe Timothy John Keefe (January 1, 1857 – April 23, 1933), nicknamed "Smiling Tim" and "Sir Timothy", was an American Major League Baseball pitcher. He stood tall and weighed . He was one of the most dominating pitchers of the 19th century and po ...

of the American Association's

New York Metropolitans The Metropolitan Club (New York Metropolitans or the Mets) was a 19th-century professional baseball team that played in New York City from 1880 to 1887. (The ''New York Metropolitan Baseball Club'' was the name chosen in 1961 for the New York ...

posted 359 against

Bobby Mathews Robert T. Mathews (November 21, 1851 – April 17, 1898) was an American right-handed professional baseball pitcher who played in the National Association of Professional Base Ball Players, the National League of Major League Baseball and the ...

' 203. The National League's largest margin was achieved in 1999, when Randy Johnson struck out 143 more batters than

Kevin Brown Kevin Brown may refer to: Entertainment * Kevin Brown (blues musician) (born 1950), English blues guitarist * Kevin Brown (author) (born 1960), American journalist and translator * Kevin Brown (poet) (born 1970), American poet and teacher * Kevin ...

. Ryan's 1973 margin of 125 strikeouts over

Bert Blyleven Bert Blyleven (born Rik Aalbert Blijleven, April 6, 1951) is a Dutch-American former professional baseball pitcher who played 22 seasons in Major League Baseball (MLB) from 1970 to 1992, primarily with the Minnesota Twins. Blyleven recorded 3,701 ...

is the best American League victory. Although ties for the championship are rare, they have occurred;

Claude Passeau Claude William Passeau (April 9, 1909 – August 30, 2003) was an American starting pitcher in Major League Baseball. From 1935 through 1947, Passeau played with the Pittsburgh Pirates (1935), Philadelphia Phillies (1936–39) and Chicago Cu ...

and

Bucky Walters William Henry "Bucky" Walters (April 19, 1909 – April 20, 1991) was an American professional baseball pitcher who played in Major League Baseball from 1931 to 1950. He was a six-time All-Star and the 1939 National League Most Valuable Player ...

each struck out 137 National League batters in 1939, and Tex Hughson and

Bobo Newsom Louis Norman "Bobo" Newsom (August 11, 1907 – December 7, 1962) was an American starting pitcher in Major League Baseball. Also known as "Buck", Newsom played for nine of the 16 then-existing big-league teams from 1929 through 1953 over all or ...

tied in the American League with 113 strikeouts each in 1942. Their total is the lowest number of strikeouts accumulated to lead a league in Major League Baseball history (although

Jacob deGrom Jacob Anthony deGrom (born June 19, 1988), is an American professional baseball pitcher for the Texas Rangers of Major League Baseball (MLB). He has previously played in MLB for the New York Mets. Prior to playing professionally, deGrom attend ...

only struck out 104 National League batters in 2020, the season was shortened by a pandemic to 60 game, or 37.04% of a regular season; had that season run a full 162 games, that would have been a net of 281 strikeouts).

Key

National League

American League

Other major leagues

Footnotes

*Recognized "major leagues" include the current

American American(s) may refer to: * American, something of, from, or related to the United States of America, commonly known as the "United States" or "America" ** Americans, citizens and nationals of the United States of America ** American ancestry, pe ...

and

s and several defunct leagues—the

, the

Federal League The Federal League of Base Ball Clubs, known simply as the Federal League, was an American professional baseball league that played its first season as a minor league in 1913 and operated as a "third major league", in competition with the e ...

, the

Players' League The Players' National League of Professional Base Ball Clubs, popularly known as the Players' League (PL), was a short-lived but star-studded professional American baseball league of the 19th century. The PL was formed by the Brotherhood of Prof ...

, and the

. *In

baseball scorekeeping Baseball scorekeeping is the practice of recording the details of a baseball game as it unfolds. Professional baseball leagues hire official scorers to keep an official record of each game (from which a box score can be generated), but many fans k ...

, "K" is the traditional notation for the strikeout. *In 1939,

played the entire season for the

Cincinnati Reds The Cincinnati Reds are an American professional baseball team based in Cincinnati. They compete in Major League Baseball (MLB) as a member club of the National League (NL) National League Central, Central division and were a charter member of ...

, while co-leader

was traded from the

Philadelphia Phillies The Philadelphia Phillies are an American professional baseball team based in Philadelphia. They compete in Major League Baseball (MLB) as a member of the National League (NL) National League East, East division. Since 2004, the team's home sta ...

to the

Chicago Cubs The Chicago Cubs are an American professional baseball team based in Chicago. The Cubs compete in Major League Baseball (MLB) as part of the National League (NL) Central division. The club plays its home games at Wrigley Field, which is located ...

mid-season.

References

;General * * ;Inline citations {{featured list Strikeout champions

Strikeout In baseball or softball, a strikeout (or strike-out) 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 deno ...

Striking out the sides