The Boston Red Sox are wearing the number 21 today to honor Roberto Clemente Day, a special occasion in Major League Baseball that commemorates the life and legacy of Roberto Clemente, a Hall of Famer and Puerto Rican baseball legend. On this day, players, coaches, and personnel wear a No. 21 patch, and some players may wear the number 21 on their jerseys to celebrate Clemente's achievements and his impact on the sport and community. The day is also part of Hispanic Heritage Month celebrations and honors Clemente's contributions on and off the field.

For the Red Sox specifically, although no current players wear No. 21, the team’s manager and coaches wore it to mark the day.

Roberto Clemente was known for wearing No. 21 throughout his entire career and was the first Latin American player elected to the Hall of Fame. The league- wide tribute on September 15 includes a league-wide patch and allows those with Puerto Rican heritage or who have won or been nominated for the Roberto Clemente Award to wear the No. 21 on their uniforms.