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baseball Baseball is a bat-and-ball games, bat-and-ball game played between two opposing teams who take turns batting (baseball), batting and fielding. The game proceeds when a player on the fielding team (baseball), fielding team, called the pit ...

baseball
, innings pitched (IP) are the number of
inning In baseball Baseball is a bat-and-ball games, bat-and-ball game played between two opposing teams who take turns batting (baseball), batting and fielding. The game proceeds when a player on the fielding team (baseball), fielding team, ...
s a
pitcher player Noah Syndergaard Noah Seth Syndergaard (born August 29, 1992), nicknamed Thor In Germanic mythology, Thor (; from non, Þórr) is a hammer-wielding god God, in monotheistic thought, is conceived of as the supreme being, creat ...

pitcher
has completed, measured by the number of
batter Batter or batters may refer to: * Batter (cooking), thin dough that can be easily poured into a pan * Batter (baseball), person whose turn it is to face the pitcher * Batter (cricket) or batsman, player who is currently batting * Batter (drum), a ...
s and baserunners that are put out while the pitcher is on the pitching mound in a game. Three outs made is equal to one inning pitched. One out counts as one-third of an inning, and two outs counts as two-thirds of an inning. Sometimes, the statistic is written 34.1, 72.2, or 91.0, for example, to represent innings, innings, and 91 innings exactly, respectively. Runners left on base by a pitcher are not counted in determining innings pitched. It is possible for a pitcher to enter a game, give up several hits and possibly even several runs, and be removed before achieving any outs, thereby recording a total of zero innings pitched. Alternatively, it is possible for a pitcher to enter a situation where there are two runners on base and no outs. He could throw one pitch that results in a
triple play In baseball Baseball is a bat-and-ball games, bat-and-ball game played between two opposing teams who take turns batting (baseball), batting and fielding. The game proceeds when a player on the fielding team (baseball), fielding team, ...
, and for that one pitch he would be credited with a full inning pitched.


Decline

The only active players in the top 100 all-time at the end of the season were
Tom Glavine Thomas Michael Glavine (born March 25, 1966) is an American former professional baseball Professional baseball is organized baseball in which players are selected for their talents and are paid to play for a specific team or club system. It is p ...
(ranked 30th with IP),
Randy Johnson Randall David Johnson (born September 10, 1963), nicknamed "the Big Unit", is an American former professional baseball Baseball is a bat-and-ball games, bat-and-ball game played between two opposing teams who take turns batting (bas ...
(ranked 38th with ),
Jamie Moyer Jamie Moyer (born November 18, 1962) is an American former professional baseball Professional baseball is organized baseball in which players are selected for their talents and are paid to play for a specific team or club system. It is played in ...
(ranked 45th with ) and
John Smoltz John Andrew Smoltz (born May 15, 1967), nicknamed "Smoltzie" and "Marmaduke," is an American former baseball pitcher who played 22 seasons in Major League Baseball from 1988 to 2009, all but the last year with the Atlanta Braves. An eight-time Maj ...
(ranked 74th with 3473). By the end of the season, only two active players were in the top 100 all-time:
CC Sabathia Carsten Charles Sabathia Jr. (born July 21, 1980) is an American former professional baseball pitcher who played 19 seasons in Major League Baseball (MLB), primarily with the New York Yankees. He also played for the Cleveland Indians and Milwauke ...

CC Sabathia
(ranked 73rd with 3470), and
Bartolo Colón Bartolo Colón (born May 24, 1973), nicknamed "Big Sexy", is a Dominican-American Dominican Americans ( es, domínico-americanos, ) are Americans Americans are the Citizenship of the United States, citizens and United States nationality ...
(ranked 74th with ). This is because over time, innings pitched has declined. Several factors are responsible for this decline: * From 1876 to 1892, pitchers threw from fifty feet and exerted less stress on their arms (also pitchers often threw underhand in this era). In this era, season totals of 600 innings pitched were not uncommon. * In 1892, pitchers moved back to the current distance of sixty feet, six inches. However, they still often threw 400 innings in a season. This was because the
home run holds the all-time home run record in Major League Baseball Major League Baseball (MLB) is a professional baseball organization and the oldest major professional sports league in the world. , a total of 30 teams play in Major League Baseb ...
was far less common and pitchers often conserved arm strength throughout the game. * From 1920 to the 1980s, the four-man pitching rotation was well established. Pitchers could no longer throw 400 innings in a season, as the
home run holds the all-time home run record in Major League Baseball Major League Baseball (MLB) is a professional baseball organization and the oldest major professional sports league in the world. , a total of 30 teams play in Major League Baseb ...
meant a run could be scored at any time. The league leader in innings pitched often threw somewhat more than 300 innings. Occasionally, innings pitched would spike, as in the early 1970s, when
Wilbur Wood Wilbur Forrester Wood Jr. (born October 22, 1941) is an American former professional baseball Baseball is a bat-and-ball games, bat-and-ball game played between two opposing teams who take turns batting (baseball), batting and fielding ...
pitched innings in and then innings in . * From the 1980s to the present, the four-man rotation was replaced with the five-man rotation, with a weak fifth man who would often be skipped on off days. Also, managers starting using their
bullpen In baseball, the bullpen (or simply the pen) is the area where relief pitchers warm-up before entering a game. A team's roster of relief pitchers is also Metonymy, metonymically referred to as "the bullpen". These pitchers usually wait in the bull ...

bullpen
s more and more, accelerating the decline in innings pitched. Today, only a few pitchers pitch more than 250 innings in a season.


Records


All-time leaders



Single season leaders

Per
Baseball Reference Baseball-Reference is a website providing baseball statistics Baseball statistics play an important role in evaluating the progress of a player or team. Since the flow of a baseball game has natural breaks to it, and normally players act individual ...
:


References


External links


All-time innings pitched leaders
{{DEFAULTSORT:Innings Pitched Pitching statistics