Brewers players are wearing the number 21 to honor Roberto Clemente. Major League Baseball celebrates Roberto Clemente Day, where all players, managers, coaches, and umpires wear a "21" patch in tribute to Clemente, a Hall of Famer and humanitarian who wore number 21 throughout his career. The number 21 is worn to celebrate his legacy both on and off the field, including his achievements as a 15-time All-Star and first Latin American player to reach 3,000 hits. Players of Puerto Rican heritage and Clemente Award nominees may also wear number 21 as a special recognition. This tradition is observed annually around September 15, marking the date MLB honors Clemente's contributions to the sport and community.