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| {{Sabermetric | formula = <math>K/9IP = 9 \cdot \frac{K}{IP}</math>}}
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| In [[baseball statistics]], '''strikeouts per 9 innings pitched''' ('''K/9''', '''SO/9''', or '''SO/9IP''') is the [[mean]] of [[strikeouts]], (or [[strikeouts|K's]]) 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 1000 innings, which generally limits the list to starters. A separate list is maintained for relievers with 300 innings pitched or 200 appearances.
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| The all-time leader in this statistic is retired pitcher [[Randy Johnson]] (10.61). The only two other players who have averaged over 10 are [[Kerry Wood (baseball player)|Kerry Wood]] (10.32) and [[Pedro Martínez]] (10.04).<ref>{{cite web|url=http://www.baseball-reference.com/leaders/strikeouts_per_nine_career.shtml|work=Baseball-Reference.com|title=K/9IP All Time Leaders}}</ref> Since Wood's retirement in May 2012, [[Tim Lincecum]] (9.7636) took over as the active leader.<ref>{{cite web|url=http://www.baseball-reference.com/leaders/strikeouts_per_nine_career.shtml|work=Baseball-Reference.com|title=K/9IP All Time Leaders}}</ref>
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| Among qualifying relievers, [[Rob Dibble]] (12.17) is the all-time leader in strikeouts per nine innings.<ref>{{cite web|url=http://www.baseball-reference.com/play-index/season_finder.cgi?type=p#gotresults&as=result_pitcher&offset=0&sum=1&min_year_season=1901&max_year_season=2011&min_season=1&max_season=-1&min_age=0&max_age=99&lg_ID=lgAny&lgAL_team=tmAny&lgNL_team=tmAny&lgFL_team=tmAny&lgAA_team=tmAny&lgPL_team=tmAny&lgUA_team=tmAny&lgNA_team=tmAny&isActive=either&isHOF=either&isAllstar=either&throws=any&role=anyrole&games_started=60&games_relieved=80&qualifiersSeason=nomin&minIpValS=162&minDecValS=14&mingamesValS=40&minIpValC=1000&minDecValC=100&qualifiersCareer=mingames&mingamesValC=200&orderby=SOp9&layout=full&c1criteria=&c1gtlt=eq&c1val=0&c2criteria=&c2gtlt=eq&c2val=0&c3criteria=&c3gtlt=eq&c3val=0&c4criteria=&c4gtlt=eq&c4val=0&c5criteria=&c5gtlt=eq&c5val=1.0&c6criteria=&location=pob&locationMatch=is&pob=&pod=&pcanada=&pusa=&ajax=1&submitter=1|work=Baseball-Reference.com|title=K/9IP leaders, minimum 200 appearances}}</ref><ref>{{cite web|url=http://www.baseball-reference.com/play-index/season_finder.cgi?type=p#gotresults&as=result_pitcher&offset=0&sum=1&min_year_season=1901&max_year_season=2011&min_season=1&max_season=-1&min_age=0&max_age=99&lg_ID=lgAny&lgAL_team=tmAny&lgNL_team=tmAny&lgFL_team=tmAny&lgAA_team=tmAny&lgPL_team=tmAny&lgUA_team=tmAny&lgNA_team=tmAny&isActive=either&isHOF=either&isAllstar=either&throws=any&role=anyrole&games_started=60&games_relieved=80&qualifiersSeason=nomin&minIpValS=162&minDecValS=14&mingamesValS=40&qualifiersCareer=minips&minIpValC=300&minDecValC=100&mingamesValC=200&orderby=SOp9&layout=full&c1criteria=&c1gtlt=eq&c1val=0&c2criteria=&c2gtlt=eq&c2val=0&c3criteria=&c3gtlt=eq&c3val=0&c4criteria=&c4gtlt=eq&c4val=0&c5criteria=&c5gtlt=eq&c5val=1.0&c6criteria=&location=pob&locationMatch=is&pob=&pod=&pcanada=&pusa=&ajax=1&submitter=1|work=Baseball-Reference.com|title=K/9IP leaders, minimum 300 innings pitched}}</ref><ref>{{cite web|url=http://www.baseball-reference.com/players/d/dibblro01.shtml|work=Baseball-Reference.com|title=Rob Dibble Statistics}}</ref> Active leader [[David Robertson (baseball)|David Robertson]] (12.03)<ref>{{cite web|url=http://www.baseball-reference.com/players/r/roberda08.shtml|work=Baseball-Reference.com|title=David Robertson Statistics}}</ref> is the only other qualifying reliever averaging more than 12.
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| One effect of K/9 is that it may reward or "inflate" the numbers for pitchers with high [[BABIP|batting averages on balls in play]] (BABIP). Two pitchers who strike out identical percentages of hitters, but have varying BABIPs, will have different K/9 rates since one pitcher will pitch fewer innings to face the same number of batters.<ref>{{cite web|title=Stop using K/9 and BB/9!|author=James Gentile|date=October 8, 2012|url=http://www.beyondtheboxscore.com/2012/10/8/3451856/mlb-pitching-k9-bb9-plate-appearances-sabermetrics|work=Beyond the Box Score|publisher=SBNation.com}}</ref>
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| ==References==
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| {{Reflist}}
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| {{Baseball statistics}}
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| {{DEFAULTSORT:Strikeouts Per 9 Innings Pitched}}
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| [[Category:Pitching statistics]]
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| {{Baseball-stub}}
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Latest revision as of 21:26, 23 February 2014
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