Putout
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In baseball statistics, a putout (PO) is awarded to a defensive player who records an out by one of the following methods:Tagging a runner with the ball when he is not touching a base
Catching a batted or thrown ball and tagging a base to put out a batter or runner
Catching a thrown ball and tagging a base to record an out on an appeal play
Catching a third strike
Catching a batted ball on the fly
Being positioned closest to a runner called out for interference
An attempted putout at first base.
Jake Beckley, all-time career leader in putouts among major-league players
Uncaught third strike
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In baseball and softball, an uncaught third strike occurs when the catcher fails to cleanly catch a pitch for the third strike of a plate appearance. In Major League Baseball (MLB), the specific rules concerning the uncaught third strike are addressed in Rules 5.05 and 5.09 of the Official Baseball Rules:
The batter Ryan Kalish attempting to advance to first base after an uncaught third strike, which the catcher has already retrieved and is about to throw to the first baseman to record the putout