Roberto Clemente and the magic of No. 21 - MLB - ESPN
MLB's Pirates will honor Roberto Clemente by wearing his number
No, we do not need to retire Roberto Clemente's number across baseball - NBC Sports
Wash Heights Pol Pushes To Retire Roberto Clemente's Number Across MLB
Pittsburgh Pirates to wear No. 21 on Sept. 9 to honor Roberto Clemente
Roberto Clemente Day: Pirates and Mets wear 21
Pittsburgh Pirates, New York Mets players, coaches to all wear No. 21 on Roberto Clemente Day - ESPN
Report: MLB allowing more players to wear No. 21 on Roberto Clemente Day
Why are MLB players wearing 21? Tributes around the league for Pirates legend explained
MLB celebrates Roberto Clemente Day, ceremony at Citi Field
Rays make MLB history with special lineup on Roberto Clemente Day
Curve to retire No. 21, honor Roberto Clemente and family
New Jersey politicians move to retire Roberto Clemente's No. 21 across all of baseball