Fourth out

Out in baseball, possible only in the same play as a third out

In baseball, a fourth out is a legal out made by the defense after three outs in a half-inning have already been made. According to the rules, the third out does not cause the ball to become dead; if the fielders make a subsequent out that prevents a run from scoring, this out will supersede the apparent third out, thus becoming the recorded third out. The defense successfully makes an appeal while the ball is still live, and the umpire calls a temporary fourth out that (usually) replaces the existing third out. For statistical purposes, the apparent third out is "undone" and the fourth out's result is recorded instead. With the advent of video replay appeals, a new rationale for making extra out(s) has emerged: insurance against a prior out being undone on appeal. These fourth-out situations are not the same as four strikeouts in an inning.

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