In baseball statistics, strikeouts per nine innings pitched (K/9, SO/9, or SO/9IP) is the mean of strikeouts (or Ks) by a pitcher per nine innings pitched. It is determined by multiplying the number of strikeouts by nine, and dividing by the number of innings pitched. To qualify, a pitcher must have pitched 1,000 innings, which generally limits the list to starters. A separate list is maintained for relievers with 300 innings pitched or 200 appearances.
The all-time leader in this statistic through 2022 is Chris Sale (11.06). The only other pitchers who had averaged over 10 strikeouts are Robbie Ray (11.03), Jacob deGrom (10.96), Yu Darvish (10.70), Max Scherzer (10.69), Randy Johnson (10.61), Stephen Strasburg (10.55), Gerrit Cole (10.45), Kerry Wood (10.32), Pedro Martinez (10.04) and Aaron Nola (10.02). [1]
The top three in 2022 were Carlos Rodon (11.98), Shohei Ohtani (11.87), and Gerrit Cole (11.53). [2]
Among qualifying relievers, Aroldis Chapman (14.88) was the all-time leader in strikeouts per nine innings through 2020, followed by Craig Kimbrel (14.66), Kenley Jansen (13.25), Rob Dibble (12.17), David Robertson (11.93), and Billy Wagner (11.92). [3] [4] [5]
In 2022 Kyle Harrison led the minor leagues with 14.8 strikeouts per 9 innings, the highest rate for a pitcher in the minors–minimum 100 innings–in a season dating back to 1960. [6] [7]
One effect of K/9 is that it may reward or "inflate" the numbers for pitchers with high batting averages on balls in play (BABIP). Two pitchers may have the same K/9 rates despite striking out a different percentage of batters since one pitcher will pitch to more batters to obtain the same cumulative number of strikeouts. For example, a pitcher who strikes out one batter in an inning, but also gives up a walk or a hit, strikes out a lower percentage of batters than a pitcher who strikes out one batter in an inning without allowing a baserunner, but both have the same K/9. [8]
Baseball statistics play an important role in evaluating the progress of a player or team.
Pedro Jaime Martínez is a Dominican-American 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.
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.
In baseball statistics, walks plus hits per inning pitched (WHIP) is a sabermetric measurement of the number of baserunners a pitcher has allowed per inning pitched. WHIP is calculated by adding the number of walks and hits allowed and dividing this sum by the number of innings pitched.
Justin Brooks Verlander is an American professional baseball pitcher for the Houston Astros of Major League Baseball (MLB). He has previously played in MLB for the Detroit Tigers and New York Mets. From Manakin-Sabot, 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.
Carlos Agustín Mármol is a Dominican former professional baseball relief pitcher. He played in Major League Baseball (MLB) for the Chicago Cubs, Los Angeles Dodgers, and the Miami Marlins. Carlos owns Recta 49, a successful restaurant/car wash in the Dominican Republic.
Andrew Mark Miller is an American former professional baseball pitcher. He played in Major League Baseball (MLB) for the Detroit Tigers, Florida Marlins, Boston Red Sox, Baltimore Orioles, New York Yankees, Cleveland Indians, and St. Louis Cardinals. Primarily a starting pitcher who struggled early in his MLB career, Miller found sustained success as a reliever utilizing a multi-faceted fastball and slider approach that proved deceptive for batters to hit. A left-handed batter and thrower, Miller stands 6 feet 7 inches (2.01 m) tall and weighs 205 pounds (93 kg).
Maxwell Martin Scherzer is an American professional baseball pitcher for the Texas Rangers of Major League Baseball (MLB). He has previously played in MLB for the Arizona Diamondbacks, Detroit Tigers, Washington Nationals, Los Angeles Dodgers, and New York Mets. A right-handed starting pitcher, Scherzer is an eight-time MLB All-Star, has won three Cy Young Awards, has pitched two no-hitters, and won the World Series with the Nationals in 2019. Known for his intensity and competitiveness on the field, he is nicknamed "Mad Max" after the media franchise of the same name.
David Alan Robertson, nicknamed D-Rob, is an American professional baseball pitcher for the Miami Marlins of Major League Baseball (MLB). He has previously played in MLB for the New York Yankees, Chicago White Sox, Tampa Bay Rays, Chicago Cubs, Philadelphia Phillies, and New York Mets.
Gerrit Alan Cole is an American professional baseball pitcher for the New York Yankees of Major League Baseball (MLB). He previously played for the Pittsburgh Pirates and Houston Astros. Cole played for the baseball team at Orange Lutheran High School, and was selected by the New York Yankees in the first round of the 2008 MLB Draft. Cole opted not to sign, and instead attended the University of California, Los Angeles (UCLA), where he played college baseball for the UCLA Bruins.
Michael Lance Lynn is an American professional baseball pitcher for the Los Angeles Dodgers of Major League Baseball (MLB). He has previously played in MLB for the St. Louis Cardinals, Minnesota Twins, New York Yankees, Texas Rangers, and Chicago White Sox.
José Ricardo Álvarez is a Venezuelan professional baseball pitcher in the Detroit Tigers organization. He has played in Major League Baseball (MLB) for the Tigers, Los Angeles Angels, Philadelphia Phillies and San Francisco Giants.
Héctor Neris is a Dominican professional baseball pitcher for the Houston Astros of Major League Baseball (MLB). He has previously played in MLB for the Philadelphia Phillies. He was signed as a free agent by the Phillies in 2010, and made his major league debut with them in 2014.
Richard Sidney Bleier is an American professional baseball pitcher in the Chicago Cubs organization. He has previously played in Major League Baseball (MLB) for the New York Yankees, Baltimore Orioles, Miami Marlins, and Boston Red Sox.
José Antonio Alvarado is a Venezuelan professional baseball pitcher for the Philadelphia Phillies of Major League Baseball (MLB). Alvarado previously played for the Tampa Bay Rays, having signed there as an international free agent in 2012. Alvarado made his major league debut in 2017.
Seranthony Ambioris Domínguez Taveras is a Dominican professional baseball pitcher for the Philadelphia Phillies of Major League Baseball (MLB). He signed with the Phillies as an international free agent, in 2011. Domínguez made his MLB debut in 2018.
Framber Valdez is a Dominican professional baseball pitcher for the Houston Astros of Major League Baseball (MLB). Valdez signed with the Astros as an international free agent in 2015, and made his MLB debut in 2018.
The 2019 Houston Astros season was the 58th season for the Major League Baseball (MLB) franchise in Houston, Texas, their 55th as the Astros, seventh in both the American League (AL) and AL West division, and 20th at Minute Maid Park.
Cristian Javier is a Dominican professional baseball pitcher for the Houston Astros of Major League Baseball (MLB). Javier signed with the Astros as an international free agent in 2015 and made his MLB debut in 2020. During the Astros' World Series championship season in 2022, Javier was the starting pitcher of two combined no-hitters—including Game 4 of the World Series—the first player in MLB history to do so. The World Series no-hitter was just the second in baseball history, and the only combined no-hitter.
Camilo Doval is a Dominican professional baseball pitcher for the San Francisco Giants of Major League Baseball (MLB). He signed with the Giants as a free agent in 2015, and made his MLB debut with them in 2021. His fastball has reached 104.5 miles per hour (168.2 km/h).
 | This baseball-related article is a stub. You can help Wikipedia by expanding it. |
