Pirates will wear Roberto Clemente No. 21
All of MLB's Puerto Rican players can wear No. 21 on Roberto Clemente Day
Pirates, Mets honor Roberto Clemente's legacy in MLB celebration
Some MLB Players Wearing #21, All Wearing 21 Patches Today for Roberto Clemente Day – SportsLogos.Net News
Roberto Clemente Day: Pirates and Mets wear 21
James McCann homers twice, White Sox top Pirates on Roberto Clemente Day
Pirates to once again wear No. 21 for Roberto Clemente Day
Pittsburgh Pirates, New York Mets players, coaches to all wear No. 21 on Roberto Clemente Day - ESPN
Roberto Clemente Day: Pirates and Mets wear 21
MLB allows Puerto Rican players to wear No. 21 on Roberto Clemente Day - ESPN
Nats DH Cruz, other Clemente Award winners wear '21' on caps - The San Diego Union-Tribune
Some MLB Players Wearing #21, All Wearing 21 Patches Today for Roberto Clemente Day – SportsLogos.Net News
MLB Celebrates Legacy of Roberto Clemente – Think Blue Planning Committee