The Tigers are wearing number 21 today to honor Roberto Clemente Day, celebrated on September 15 each year across Major League Baseball (MLB). This day commemorates Roberto Clemente, the Puerto Rican Hall of Famer and humanitarian who wore No. 21 throughout his career. MLB players, managers, and coaches wear a No. 21 patch or the number itself to honor Clemente's legacy both on and off the field, especially recognizing his humanitarian efforts and impact as a Latino sports icon. This tradition has been embraced league-wide, including the Tigers team and other teams, particularly to celebrate Hispanic Heritage Month and Clemente's inspiring story.

The Tigers' wearing of 21 today aligns with this broader MLB tradition of paying tribute to Clemente's outstanding achievements and character.