Carlos Delgado says MLB should retire Roberto Clemente's No. 21
Pirates, Major League Baseball, Set to Honor the Great One on Clemente Day - Pittsburgh Baseball Now
Why are MLB players wearing 21? Tributes around the league for Pirates legend explained
Roberto Clemente day: Puerto Rican MLB players, Pirates wear No. 21
Curve Set to Retire No. 21 In Honor of Roberto Clemente
Javier Baez uncertain he will be a long-term Met
Curve to retire No. 21, honor Roberto Clemente and family
Report: Puerto Rican MLB Players Allowed to Wear No. 21 on Roberto Clemente Day, News, Scores, Highlights, Stats, and Rumors
Honoring 21: Cubs' Nelson Velázquez proud to take field in honor of relative, Roberto Clemente - Marquee Sports Network