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Official Rules of Major League Baseball

4.03 (4.01) Exchange of Lineup Cards

4.03 (4.01) Exchange of Lineup Cards Unless the home club shall have given previous notice that the game has been postponed or will be delayed in starting, the umpire, or umpires, shall enter the playing field five minutes before the hour set for the game to begin and proceed directly to home base where they shall be met by […]

Umpire Interpretations of Major League Baseball
(©MLB Umpire Manual)

4. LINEUP CARDS

Rule 4.03 [former Rule 4.01]: Each manager should write the name of each eligible player on the face of his club’s batting order card in addition to furnishing the starting lineup.  However, a manager’s failure to list an eligible player does not prevent that player from enter-ing the game, nor is such failure grounds for protest, […]