MLB's Pirates will honor Roberto Clemente by wearing his number
For the 'Great One': Pirates, MLB honor Roberto Clemente
Roberto Clemente - Wikipedia
Five Astros wear No. 21 on Roberto Clemente Day
Clemente Award winners allowed to wear '21' on caps
All Pirates Wearing #21, Rest of MLB Wears Patches in Honour of Roberto Clemente – SportsLogos.Net News
Pittsburgh Pirates to wear No. 21 on Sept. 9 to honor Roberto Clemente
Honoring 21: Cubs' Nelson Velázquez proud to take field in honor of relative, Roberto Clemente - Marquee Sports Network
Roberto Clemente Day: MLB expands list of who can wear No. 21 to Pirates, Puerto Rican players, award nominees
Roberto Clemente Day to Be Held Throughout MLB on Thursday – NBC Bay Area
Dodgers News: Kiké Hernandez, Edwin Rios Honored To Wear No. 21 On Roberto Clemente Day
MLB allows Puerto Rican players to wear No. 21 on Roberto Clemente Day - ESPN