Inbaseball statistics,strikeouts per nine innings pitched(abbreviatedK/9,SO/9,orSO/9IP) is themeanofstrikeouts(orKs) by apitcherper nineinnings pitched.It is determined by multiplying the number of strikeouts by nine, and dividing by the number of innings pitched.
Leaders in Major League Baseball
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The all-timeMajor League Baseball(MLB) career leader (minimum of 1,000innings pitched) in this statistic through 2022 isChris Sale(11.06). The only other pitchers who had averaged over 10 K/9 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) andAaron Nola(10.02).[1]
The top three during the2022season wereCarlos Rodon(11.98),Shohei Ohtani(11.87), andGerrit Cole(11.53).[2]
The career leader in K/9 among MLB relievers (minimum of either 300 innings pitched or 200 appearances) through 2020 wasAroldis Chapman(14.88), followed byCraig Kimbrel(14.66),Kenley Jansen(13.25),Rob Dibble(12.17),David Robertson(11.93), andBilly Wagner(11.92).[3][4][5]
In 2022,Kyle HarrisonledMinor League Baseballwith 14.8 strikeouts per 9 innings, the highest rate for a pitcher in the minor leagues in a season (minimum of 100 innings pitched) dating back to 1960.[6][7]
Analysis
editOne effect of K/9 is that it may reward or "inflate" the numbers for pitchers with highbatting 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 awalkor ahit,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.
- ^"Year-by-Year Top-Tens Leaders & Records for Strikeouts per 9 IP".Baseball-Reference.
- ^"K/9IP leaders, minimum 200 appearances".Baseball-Reference.
- ^"K/9IP leaders, minimum 300 innings pitched".Baseball-Reference.
- ^"Rob Dibble Statistics".Baseball-Reference.
- ^"Top Pitching Prospects | Left-Handed".MLB.
- ^"Kyle Harrison Stats, Fantasy & News".MLB.
- ^James Gentile (October 8, 2012)."Stop using K/9 and BB/9!".Beyond the Box Score.SBNation.
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