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I made a defensive substitution for the pitcher in the 3rd inning. When I ended the game, the stats show the relief pitcher throwing all 6 innings. What did I do wrong and can it be corrected after the game has been finalized?

This means you changed the starting lineup instead of performing a substitution. See the following link for information on performing substitutions:

http://iscoresports.com/baseball/kb/faq ... tution.php

You can edit the starting lineup and perform the substitution post game to fix the mistake by following the instructions here:

http://iscoresports.com/baseball/kb/faq ... _edits.php