LEADING OFF: Pirates, Puerto Rican MLBers wear Clemente's 21

Chicago Cubs starting pitcher Yu Darvish, of Japan, throws against the St. Louis Cardinals during the first inning of a baseball game in Chicago, Friday, Sept. 4, 2020. (AP Photo/Nam Y. Huh)

File-Pittsburgh Pirates outfielder Roberto Clemente. The Pittsburgh Pirates will honor Hall of Famer Roberto Clemente when they wear No. 21 against the Chicago White Sox on Wednesday, Sept. 9, 2020. The team believes this is an important step into having Clemente's number retired by Major League Baseball(Pittsburgh Tribune-Review via AP, File)/