Houston Astros: 8 players don No. 21 on Roberto Clemente Day

Pittsburgh Pirates each don No. 21 to honor Roberto Clemente - ESPN

Kyle Gibson earns third Roberto Clemente Award nomination

MLB celebrates Roberto Clemente Day as players wear No. 21, call for number to be retired

Pirates honour Roberto Clemente and Rockies' clawback late win over Giants

Javier Baez uncertain he will be a long-term Met

Report: Puerto Rican MLB Players Allowed to Wear No. 21 on Roberto Clemente Day, News, Scores, Highlights, Stats, and Rumors

October 1, 1967: Roberto Clemente 'manages' Pirates in season finale and wins fourth NL batting crown – Society for American Baseball Research

A's Joel Payamps gives up pivotal home run in 5-2 loss to Astros

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