MLB's Pirates will honor Roberto Clemente by wearing his number
Mets, Pirates to Wear No. 21 on Clemente Day - Metsmerized Online
Some MLB Players Wearing #21, All Wearing 21 Patches Today for Roberto Clemente Day – SportsLogos.Net News
For the 'Great One'; Pirates, MLB honor Roberto Clemente
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Pittsburgh Pirates to wear No. 21 on Sept. 9 to honor Roberto Clemente