MLB allows Puerto Rican players to wear No. 21 on Roberto Clemente
Roberto Clemente day: Puerto Rican MLB players, Pirates wear No. 21
Hot take: Roberto Clemente Day should be just like Jackie Robinson
Pirates honor Roberto Clemente but come up short on baseball end
Uniform number (Major League Baseball) - Wikipedia
Pittsburgh Pirates to wear No. 21 on Roberto Clemente Day
Should Roberto Clemente's #21 Be Universally Retired Across MLB
Pittsburgh Pirates will all wear No. 21 to celebrate Roberto
Pirates, MLB honor Roberto Clemente - Bucs Dugout
Yankees glad to be in Pittsburgh on day Roberto Clemente was honored
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Mets, Pirates to Wear No. 21 on Clemente Day - Metsmerized Online