MLB Rules
🏛️Official — MLB4.2 Substitutions (OBR Rule 5.10)
Verdict
Per OBR Rule 5.10(a), the manager shall immediately notify the umpire-in-chief when a substitution is made. A substitute player, once entered in the game, cannot be removed and re-entered; a player removed from the game is finished for that game.
Source: Rule 5.10, Rule 5.11
Send this to your friend — argument over.
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