That's a pretty vague question. There are numerous rules pertaining to offensive and defensive substitutions, and they vary between the American and National leagues (mainly because of the DH rule). Most of the substitution protocols are covered in rule 3.
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scorekeeper.
Just like any sport there is A LOT of rules and revisions that have been made to the game.
Yes they can I play baseball and my coach can have rules and regulation books on the field
major league baseball
Yep, Major League Baseball or MLB.
No. Major League Baseball is real.
Major Baseball League
Click on the 'MLB Rules' link below to access the MLB Rule book from mlb.com.
major league baseball is the hightest baseball league with the best players
Major League Baseball.
Major league baseball is hardball.