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.
LeadersEdit
Aroldis Chapman was the active leader in 2020 in strikeouts per 9 innings among relievers with over 200 appearances.
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]
AnalysisEdit
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]
ReferencesEdit
^"K/9IP All Time Leaders". Baseball-Reference.com.
^"Year-by-Year Top-Tens Leaders & Records for Strikeouts per 9 IP". Baseball-Reference.com.
strikeouts, nine, innings, pitched, baseball, statistics, strikeouts, nine, innings, pitched, mean, strikeouts, pitcher, nine, innings, pitched, determined, multiplying, number, strikeouts, nine, dividing, number, innings, pitched, qualify, pitcher, must, have. 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 Leaders Edit Aroldis Chapman was the active leader in 2020 in strikeouts per 9 innings among relievers with over 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 Analysis EditOne 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 References Edit K 9IP All Time Leaders Baseball Reference com Year by Year Top Tens Leaders amp Records for Strikeouts per 9 IP Baseball Reference com K 9IP leaders minimum 200 appearances Baseball Reference com K 9IP leaders minimum 300 innings pitched Baseball Reference com Rob Dibble Statistics Baseball Reference com Top Pitching Prospects Left Handed MLB com Kyle Harrison Stats Fantasy amp News MLB com James Gentile October 8 2012 Stop using K 9 and BB 9 Beyond the Box Score SBNation com This baseball related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Strikeouts per nine innings pitched amp oldid 1172052791, wikipedia, wiki, book, books, library,
