Pittsburgh Pirates, New York Mets players, coaches to all wear No. 21 on Roberto Clemente Day - ESPN
Report: MLB allowing more players to wear No. 21 on Roberto Clemente Day
Major League Baseball (MLB) will continue to honor Roberto Clemente in its own way and in perpetuity. โ Latino Sports
Should Roberto Clemente's #21 Be Universally Retired Across MLB?
It's time for Roberto Clemente's No. 21 to be retired across baseball - Bucs Dugout
Francisco Lindor, Carlos Carrasco help Mets snap streak against Pirates
Pirates will honor Roberto Clemente by wearing his No. 21 on their jerseys - ESPN
Nats DH Cruz, other Clemente Award winners wear '21' on caps - The San Diego Union-Tribune
A Uni Watch Look at MLB's Roberto Clemente Day