Strikeouts per 9 innings pitched

# Strikeouts per 9 innings pitched

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In baseball statistics
Baseball statistics
Statistics play an important role in summarizing baseball performance and evaluating players in the sport.Since the flow of a baseball game has natural breaks to it, and normally players act individually rather than performing in clusters, the sport lends itself to easy record-keeping and statistics...

, strikeouts per 9 innings pitched (K/9IP or K/9) is the mean
Mean
In statistics, mean has two related meanings:* the arithmetic mean .* the expected value of a random variable, which is also called the population mean....

of strikeouts, (or K's) by a pitcher
Pitcher
In baseball, the pitcher is the player who throwsthe 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 a walk. In the numbering system used to record defensive plays, the...

per nine innings pitched
Innings pitched
In baseball, innings pitched are the number of innings a pitcher has completed, measured by the number of batters and baserunners that are put out while the pitcher 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...

. It is determined by multiplying the number of strikeouts by nine and dividing by the number of innings pitched.

The all-time leader in this statistic is retired pitcher, Randy Johnson
Randy Johnson
Randall David Johnson , nicknamed "The Big Unit", is a former Major League Baseball left-handed pitcher. During a 22-year career, he pitched for six different teams....

(10.6098). The only two other players who have averaged over 10 are, Kerry Wood (10.3432), and Pedro Martínez
Pedro Martínez
Pedro Jaime Martínez is a retired Major League Baseball pitcher. He is an eight-time All-Star, three-time Cy Young Award winner, and 2004 World Series champion...

(10.0398). As of 2011, Wood is the active leader and is still striking out more than 10 batters per 9 innings. Note that the previous statement is based on a minimum of 1000 innings pitched, which applies mostly to starting pitchers. For relievers, 300 career innings pitched or 200 appearances is used as the minimum. The record holder is Rob Dibble
Rob Dibble
Robert Keith Dibble is a former Major League Baseball pitcher and television analyst.-Personal life:Dibble is a graduate of Southington High School in Southington, Connecticut...

(RP) who is the all-time leader in strikeouts per nine innings (12.17) among qualifying relievers. After qualifying with his 200th appearance on September 16, 2011, David Robertson
David Robertson (baseball)
David Alan Robertson is a Major League baseball pitcher for the New York Yankees.-High school career:Robertson was born in Birmingham, Alabama, and played his first three years at Central-Tuscaloosa High School. He was a 2-year starter for the Falcons at shortstop and pitcher...

(RP) (12.0297) stands as the active leader through the 2011 season, surpassing Brad Lidge