why are baseball players wearing 21 today

Baseball players are wearing the number 21 today to honor Roberto Clemente on Roberto Clemente Day, which is celebrated on September 15 each year. MLB players, managers, coaches, and umpires wear a white number 21 patch on their uniforms to recognize Clemente, who was a legendary Puerto Rican player, humanitarian, and Hall of Famer. Additionally, players of Puerto Rican heritage, past Roberto Clemente Award recipients, and nominees have the option to wear the number 21 on their jerseys. The Pittsburgh Pirates, Clemente's team for his entire career, also wear number 21 in his tribute. This honors Clemente's legacy both on the field and for his humanitarian work before his death in 1972 during an earthquake relief mission.