MLB Pitching Change Rules: Can You Change a Pitcher Mid-At-Bat?
Question Last night I had both umpires tell me that you cannot change pitchers during a batters at bat. You must wait until the pitcher completes that batters entire at bat. They cited this is a major league rule. I disagree. I believe you can change pitchers with a count already on a batter regardless of whether the pitcher is injured or not.
Answer The MLB rule is that a coach may not visit the mound twice while the same batter is at bat. There is nothing saying that you cannot remove a pitcher during an at-bat. Visit this site and look at rule 8.06: