A's Vimael Machin 'honored' to wear No. 21 on Roberto Clemente Day
For the 'Great One'; Pirates, MLB honor Roberto Clemente
Puerto Rican players follow Pirates' push to wear No. 21, celebrate Roberto Clemente
For the 'Great One'; Pirates, MLB honor Roberto Clemente – KXAN Austin
All Pirates Wearing #21, Rest of MLB Wears Patches in Honour of Roberto Clemente – SportsLogos.Net News
Sources: MLB letting more players to wear No. 21 for Clemente Day
Pittsburgh Pirates Celebrate Roberto Clemente Day By Wearing His Number
ESPN: MLB to allow Pirates, Puerto Rican players, award nominees to wear No. 21 on Roberto Clemente Day
Pirates will honor Roberto Clemente by wearing his No. 21 on their jerseys - ESPN
Angels' José Molina does his best to honor Roberto Clemente - Los Angeles Times