why are mlb players wearing a 21 patch

MLB players are wearing a "21" patch to honor Roberto Clemente on Roberto Clemente Day, which is September 15, 2025. The patch commemorates Clemente’s legacy as a Hall of Famer, humanitarian, and the first Latin American player to achieve 3,000 hits. All players, managers, coaches, and umpires wear the patch as a sign of respect for Clemente, who wore No. 21 throughout his career. Players of Puerto Rican heritage, previous Roberto Clemente Award winners, and nominees also have the option to wear the actual number 21 on their jerseys on this day. The number and patch celebrate his remarkable career and philanthropic contributions, especially highlighting his legacy during National Hispanic Heritage Month.