The Dodgers are wearing number 21 today to honor Roberto Clemente as part of Major League Baseball's celebration of Roberto Clemente Day, which occurs every September 15. Players who are nominees or recipients of the Roberto Clemente Award, as well as Puerto Rican players, are allowed to wear the No. 21 jersey to pay tribute to the Hall of Famer Roberto Clemente. Mookie Betts, the Dodgers' nominee for the award this year, is wearing No. 21 to recognize Clemente's legacy and his own nomination for the award. Additionally, all teams are wearing a No. 21 patch on their uniforms during this celebration, and the Pirates wear No. 21 across their entire roster as Clemente's original team. This tradition honors Clemente's contributions both on and off the field, his humanitarian work, and his lasting impact on baseball and society.