Major League Baseball players are wearing the number 21 to honor Roberto Clemente, a legendary Hall of Famer and humanitarian. September 15 is celebrated as Roberto Clemente Day across MLB, coinciding with the start of National Hispanic Heritage Month. On this day, all players, managers, and coaches wear a "21" patch on their uniforms as a symbol of respect for Clemente, who wore number 21 throughout his career. Additionally, players of Puerto Rican heritage, past Roberto Clemente Award winners, and nominees for the award may wear the number 21 on their jerseys. The tribute honors Clemente's exceptional baseball career and his significant humanitarian efforts, including his tragic death while delivering aid to earthquake victims in Nicaragua.
The Roberto Clemente Award, named after him, recognizes players for philanthropic contributions to their communities, reflecting the spirit Clemente embodied both on and off the field.