OFFICIAL BASEBALL RULES

Rule 5.10Rule 5.10(e) Comment (3.04 Comment): This rule is intendedto eliminate the practice of using so-called courtesy runners.No player in the game shall be permitted to act as a courtesyrunner for a teammate. No player who has been in the gameand has been taken out for a substitute shall return as a courtesyrunner. Any player not in the lineup, if used as a runner,shall be considered as a substitute player.(f) (3.05(a)) The pitcher named in the batting order handed theumpire-in-chief, as provided in Rules 4.02(a) and 4.02(b)(Rules 4.01(a) and 4.01(b)), shall pitch to the first batter or anysubstitute batter until such batter is put out or reaches first base,unless the pitcher sustains injury or illness which, in the judgmentof the umpire-in-chief, incapacitates him from pitching.(g) (3.05(b)) If the pitcher is replaced, the substitute pitcher shallpitch to the batter then at bat, or any substitute batter, until suchbatter is put out or reaches first base, or until the offensive teamis put out, unless the substitute pitcher sustains injury or illnesswhich, in the umpire-in-chief’s judgment, incapacitates him forfurther play as a pitcher.(h) (3.05(c)) If an improper substitution is made for the pitcher, theumpire shall direct the proper pitcher to return to the game untilthe provisions of this rule are fulfilled. If the improper pitcheris permitted to pitch, any play that results is legal. Theimproper pitcher becomes the proper pitcher as soon as hemakes his first pitch to the batter, or as soon as any runner isput out.Rule 5.10(h) Comment (Rule 3.05(c) Comment): If a managerattempts to remove a pitcher in violation of Rule 5.10(h) (Rule3.05(c)) the umpire shall notify the manager of the offendingclub that it cannot be done. If, by chance, the umpire-in-chiefhas, through oversight, announced the incoming improperpitcher, he should still correct the situation before the improperpitcher pitches. Once the improper pitcher delivers a pitch hebecomes the proper pitcher.(i) (3.05(d)) If a pitcher who is already in the game crosses thefoul line on his way to take his place on the pitcher’s plate tostart an inning, he shall pitch to the first batter until such batter52