Jackie Robinson Day - Wikipedia
All Pirates Wearing #21, Rest of MLB Wears Patches in Honour of
Nats DH Cruz, other Clemente Award winners wear '21' on caps
Pirates, Mets wear 21 on Roberto Clemente Day
Pittsburgh Pirates, New York Mets players, coaches to all wear No
Pirates wear No. 21 to honor Roberto Clemente
It's time for Roberto Clemente's No. 21 to be retired across
Pirates wear No. 21 to honor Roberto Clemente
For the 'Great One': Pirates, MLB honor Roberto Clemente