Strikeout-to-walk ratio

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In baseball statistics, strikeout-to-walk ratio (K/BB) is a measure of a pitcher's ability to control pitches; calculated as: strikeouts divided by bases on balls. A pitcher that possesses a great K/BB ratio is usually a dominant power pitcher, such as Randy Johnson, Pedro Martínez, Curt Schilling, or Mariano Rivera. However, in 2005, Minnesota Twins starting pitcher Carlos Silva easily led the major leagues in K/BB ratio with 7.89:1, despite only striking out 71 batters over 188⅓ innings pitched; he walked only nine batters.[1] The player with the highest regular season K/BB ratio is New York Mets pitcher Bret Saberhagen in 1994, with a ratio of 11.0 (143 strikeouts and 13 walks),[2] but that season was shortened by the player's strike.

A hit by pitch is not counted statistically as a walk and therefore not counted in the strikeout-to-walk ratio. At youth levels where hit by pitches are more common, including hit by pitches may be a more useful statistic. Walks plus hits per inning pitched can also be used to compare pitchers.


  1. ^ "MLB Player Pitching Stats -2005". ESPN. Retrieved 5 July 2013. 
  2. ^ "Single-Season Leaders & Records for Strikeouts / Base On Balls". Retrieved 5 July 2013.