Why are MLB players wearing 21? Tributes around the league for Pirates legend explained

Pirates will honor Roberto Clemente by wearing his No. 21 on their jerseys - ESPN

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Roberto Clemente: Baseball Rebel – Society for American Baseball Research

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El Magnífico

TRIBUTE TO 42: Clarion-Limestone's Logan Lutz Dons Jackie Robinson's Number to Honor MLB Trailblazer's Legacy –

Pirates, Mets wear 21 on Roberto Clemente Day

Why are MLB players wearing 21? Tributes around the league for Pirates legend explained

MLB's Puerto Rican-born players honor Roberto Clemente by wearing 21

Mets honor Roberto Clemente at Citi Field