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A strikeout (aka, K (for pitching statistics), SO (for batting statistics), caught swinging, punch out, caught looking) is recorded when there are three strikes against the batter. If the catcher catches the third strike, the third strike is the result of a foul bunt, or first base is occupied and there are less than two outs, the batter is out and the catcher is credited with a putout. If the catcher fails to catch the third strike while first base is unoccupied and/or there are two out, the batter becomes a runner just as if he had hit a ground ball.

In either case, the pitcher is credited with a strikeout, but does not receive credit for an assist. If the third strike is not caught and the batter reaches first base safely, the official scorer rules whether the failure to catch the third strike was caused by the pitcher, in which case it is ruled a strikeout and wild pitch, or by the catcher, in which case it is rule a strikeout and passed ball. An error is only charged if the catcher or another fielder makes an additional misplay, such as an errant throw or muffed catch, in allowing the batter to reach base. 

Because a pitcher can receive credit for a strikeout even when the batter reaches base safely, it's possible for him to strike out more than three batters in one inning. It's theoretically possible to record an arbitrary number of strikeouts in an inning, but the major league record is 4. The record is shared by over 50 different pitchers. Chuck Finley was the first pitcher in MLB history to record 4 strikeouts in an inning more than once, and he managed the feat 3 times. Others who have done so twice include A.J. Burnett and Craig Kimbrel.

A strikeout is both a statistic for the batter and the pitcher. For batters, the ability to avoid strikeouts was long considered highly desirable, with Joe Sewell setting records for being the hardest player to whiff. Recent decades have seen a number of otherwise very productive batters accumulate high strikeout totals; this reflects a change of approach, with sabermetrics arguing that a strikeout is just another out, and that a batter is not any worse for being out of strikes instead of hitting into a great number of ground outs or fly outs, as long as he is productive when he does make contact and draws a fair number of walks as well.

The record for strikeouts in a nine-inning game is 20, shared by three pitchers: Roger Clemens who did it twice, Kerry Wood and Max Scherzer. Two teams, the 2012 Los Angeles Angels of Anaheim and the 2017 Boston Red Sox have also reached the mark while using multiple pitchers. The record for an extra-inning game is 26, by the 2004 Anaheim Angels, and the record for a relief pitcher is 16, by Randy Johnson. Johnson also once struck out 20 batters in 9 innings; as that game went into extra innings, he was originally not credited with a share of the record for a nine-inning game, but that since been changed.

Further Reading[edit]

  • Stan McNeal: "Generation K in full swing and miss", USA Today Sports, May 16, 2014. [1]

See Also[edit]