What must occur if a player unreported to the umpire enters the game?

When a player who has not reported to the umpire enters the game, the appropriate action is for the plate umpire to address the situation by fixing the lineup after the incident is discovered. This ensures the integrity of the game is maintained, as it reflects the necessity for all player substitutions to be reported formally to the umpire.

The correction to the lineup serves to document the actual players participating in the game according to the official rules. Proper reporting of player changes allows for consistent oversight and avoids confusion regarding who is eligible to participate, thereby minimizing potential disputes over player eligibility and game integrity.

While there are other measures related to penalties for unreported changes, the primary action centers on adjusting the lineup after the fact to accurately reflect player participation and uphold the regulations of the game.