Warmup Pitches

Definition

When taking their position at the beginning of an inning or when relieving another pitcher, pitchers are permitted to throw up to eight warmup pitches and must deliver their final toss at least 20 seconds before the end of an inning break or pitching change. Exceptions may be granted in certain cases, such as if the pitcher or catcher ended the prior half-inning at bat or on base.

Should a pitcher enter the game to replace one who was removed due to an injury or another emergent situation, he is granted as many warmup pitches as the umpire allows.

Watch: MLB.com explains the rule pertaining to warmup pitches.