To Pirates catcher Michael Perez, wearing No. 21 'very special
Wearing Roberto Clemente's No. 21 an honor for Francisco Lindor, Sandy Alomar Jr. and all Puerto Rican-born Cleveland Indians
It's time for Roberto Clemente's No. 21 to be retired across baseball - Bucs Dugout
Roberto Clemente Award winners to wear cap patch
Why Liam Hendriks is the White Sox' Roberto Clemente Award nominee – NBC Sports Chicago
Why some players have No. 21 on back of their baseball caps
Padres should retire Caminiti's #21 before it's too late
All #MLB players will wear a special black/white/gold #21 patch on their jerseys today in honour of Roberto Clemente Day. Pirates players…
All Pirates Wearing #21, Rest of MLB Wears Patches in Honour of Roberto Clemente – SportsLogos.Net News
Nats DH Cruz, other Clemente Award winners wear '21' on caps
Fernando Cruz, Alexis Diaz honored to wear No. 21 on Clemente Day
Complete list of VC Pirates Baseball Club All-Stars