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					Originally Posted by UmpJM (nee CoachJM)  Mike51,
 That's an "unannounced sub". If the sub had eligibility to enter and had not earlier batted in a different spot in the order, it's  perfectly legal.
 
 JM
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 And, even if he was not eligible to enter, it's still a sub.  Under OBR (per the OP), the hit stands, the original player is out of the game, and the illegal sub is removed from base, a legal sub is put in.