Cardinals' Yadier Molina homers in first at-bat while wearing Roberto Clemente's No. 21
Pittsburgh Pirates will wear jersey No. 21 to honor Roberto Clemente
Why are MLB players wearing 21? Tributes around the league for Pirates legend explained
Rangers, MLB honor late Hall of Famer Roberto Clemente with uniform patch, jersey numbers
Nats DH Cruz, other Clemente Award winners wear '21' on caps
Pittsburgh Pirates to wear No. 21 on Roberto Clemente Day
Sources: MLB letting more players to wear No. 21 for Clemente Day
Roberto Clemente day: Puerto Rican MLB players, Pirates wear No. 21
Some MLB Players Wearing #21, All Wearing 21 Patches Today for Roberto Clemente Day – SportsLogos.Net News
MLB - Today and every September 15th going forward, we will celebrate the life and legacy of Roberto Clemente. #ClementeDay
Pittsburgh Pirates will wear jersey No. 21 to honor Roberto Clemente
Yadier Molina hits home run while wearing Clemente's No. 21 (Video)
Pirates And MLB To Celebrate Roberto Clemente Day, WESB B107.5-FM/1490-AM
Roberto Clemente and the magic of No. 21 - MLB - ESPN