Today is Roberto Clemente Day and MLB NEEDS to Retire #21 in his Honor #RobertoClemente
Cardinals, Molina homers wearing 21 on Roberto Clemente Day
Nats DH Cruz, other Clemente Award winners wear '21' on caps
Roberto Clemente: More than Latin America's baseball star
MLB expands list of who can wear No. 21 to honor Roberto Clemente on Sept. 15 - ESPN
Cardinals notebook: Besides Lars Nootbaar, four others wear No. 21 in Clemente's honor
Baseball Celebrates Clemente with “21” Patches; Pirates and Award Winners All Wearing #21 – SportsLogos.Net News
MLB's Pirates will honor Roberto Clemente by wearing his number
Roberto Clemente Day Serves as Another Reminder to Retire No. 21