Strikeouts per 9 innings pitched

K/9IP = 9 \cdot \frac{K}{IP}

In baseball statistics, strikeouts per 9 innings pitched (K/9IP or K/9) is the mean of strikeouts, (or 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.

The all-time leader in this statistic is retired pitcher, Randy Johnson (10.6098). The only two other players who have averaged over 10 are, Kerry Wood (10.3432), and Pedro Martínez (10.0398).[1] As of 2011, Wood is the active leader and is still striking out more than 10 batters per 9 innings.[2] 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 (RP) who is the all-time leader in strikeouts per nine innings (12.17) among qualifying relievers.[3][4][5] After qualifying with his 200th appearance on September 16, 2011, David Robertson (RP) (12.0297)[6] stands as the active leader through the 2011 season, surpassing Brad Lidge (RP) (11.9545).[7]

References

  1. ^ "K/9IP All Time Leaders". Baseball-Reference.com. http://www.baseball-reference.com/leaders/strikeouts_per_nine_career.shtml. 
  2. ^ "Kerry Wood Statistics". Baseball-Reference.com. http://www.baseball-reference.com/players/w/woodke02.shtml. 
  3. ^ "K/9IP leaders, minimum 200 appearances". Baseball-Reference.com. 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. 
  4. ^ "K/9IP leaders, minimum 300 innings pitched". Baseball-Reference.com. 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. 
  5. ^ "Rob Dibble Statistics". Baseball-Reference.com. http://www.baseball-reference.com/players/d/dibblro01.shtml. 
  6. ^ "David Robertson Statistics". Baseball-Reference.com. http://www.baseball-reference.com/players/r/roberda08.shtml. 
  7. ^ "Brad Lidge Statistics". Baseball-Reference.com. http://www.baseball-reference.com/players/l/lidgebr01.shtml.