From the manual..
Quote:
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Visit Mound The manager visits the pitcher on the mound. This option is usually used to try to calm down the pitcher if he has gotten in trouble. This option also helps use up some time if you are warming up a relief pitcher, and gives the manager a better idea of how tired his pitcher is.
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There is a chance it can "help" the pitcher but... like real life it doesn't work all of the time.