Pirates to wear No. 21 on Sept. 9 to honor Roberto Clemente
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ESPN: MLB to allow Pirates, Puerto Rican players, award nominees to wear No. 21 on Roberto Clemente Day
Pirates will wear Roberto Clemente No. 21
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Pirates to wear Roberto Clemente's number on Sept. 9 - Uniform Authority
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Roberto Clemente's #21 To Be Worn By All Pittsburgh Pirates For Clemente Day