The New York Yankees are wearing the number 21 on their jerseys to honor Roberto Clemente. This tradition takes place on Roberto Clemente Day, observed every September 15, which coincides with the start of Hispanic Heritage Month. Players across Major League Baseball have the option to wear number 21 to celebrate the legacy of Clemente, a Puerto Rican Hall of Famer who wore that number throughout his career. This tribute is to recognize his contributions both on and off the field, including his sportsmanship, community involvement, and humanitarian efforts. Several Yankees stars, including Aaron Judge, have worn number 21 to pay homage to Clemente's enduring impact on the game and society.