pitcher moving positions in the same inning

RulesMLB Umpire Manual


Rules 5.10(d) Comment, 5.10(g): The purpose of this Comment is to prohibit a player from being a substitute for a pitcher more than once in the same inning. Thus, a player who starts (or enters the game during) an inning as a pitcher may substitute for any position(s) afterwards; however, he may not return to…

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