Pirates walk off on Roberto Clemente Day as push to retire his No. 21 continues
MLB expands list of who can wear No. 21 to honor Roberto Clemente on Sept. 15 - ESPN
Pirates celebrate Roberto Clemente Day 2020
Roberto Clemente, A for Athlete
Pirates will honor Roberto Clemente by wearing his No. 21 on their jerseys - ESPN
Pirates to once again wear No. 21 for Roberto Clemente Day
Houston Astros: 8 players don No. 21 on Roberto Clemente Day
Pittsburgh Pirates, New York Mets players, coaches to all wear No. 21 on Roberto Clemente Day - ESPN
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MLB's Puerto Rican-born players honor Roberto Clemente by wearing 21
Yankees help pay tribute to former Pirates great Roberto Clemente - Newsday