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 who 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 striking out only 71 batters over 188⅓ innings pitched; he walked only nine batters. The player with the highest regular season K/BB ratio is Minnesota Twins pitcher Phil Hughes in 2014, with a ratio of 11.6 (186 strikeouts and 16 walks), A hit by pitch is not counted statistically as a walk and therefore not counted in the strikeout-to-walk ratio.
- "MLB Player Pitching Stats -2005". ESPN. Retrieved 5 July 2013.
- "Hughes Loses 500k Bonus Due to Rain Delay". ESPN.com. Retrieved 24 September 2014.. Despite pitching only 149 innings in 2016, Clayton Kershaw set a new record for K/BB ratio by striking out 172 batters while walking only 11 for a ratio of 15.6.
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