MLB's Puerto Rican-born players honor Roberto Clemente by wearing 21
Some MLB Players Wearing #21, All Wearing 21 Patches Today for
MLB Celebrates Roberto Clemente Day
Roberto Clemente: Baseball Rebel – Society for American Baseball
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Cubs' Javier Baez honored to wear No. 21 on Roberto Clemente Day
MLB allows more players to wear No. 21 to honor Roberto Clemente
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Roberto Clemente - Wikipedia
Roberto Clemente day: Puerto Rican MLB players, Pirates wear No. 21
Uniform number (Major League Baseball) - Wikipedia
