Was Roberto Clemente the Best MLB Player to Wear No. 21?
Why are MLB players wearing 21? Tributes around the league for Pirates legend explained
Baseball celebrates Roberto Clemente Day to honour Puerto Rican legend - World Baseball Softball Confederation
Roberto Clemente's No. 21 is 'retired in our hearts' but not on most MLB rosters - The Athletic
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Puerto Rican Twins don No. 21 in tribute to Roberto Clemente – Twin Cities
Roberto Clemente remains Latino legend 50 years after death
Roberto Clemente and the magic of No. 21 - MLB - ESPN
Pirates will honor Roberto Clemente by wearing his No. 21 on their jerseys - ESPN
MLB Celebrates Roberto Clemente Day
MLB celebrates Roberto Clemente Day, ceremony at Citi Field
MLB allows more players to wear No. 21 to honor Roberto Clemente – NBC Sports Chicago
Puerto Rican Twins don No. 21 in tribute to Roberto Clemente – Twin Cities
Living out the legacy: Curve retire No. 21 as reminder of Clemente's greatness
Sieger: Some say Roberto Clemente was the greatest ever – The Vacaville Reporter
Angels' José Molina does his best to honor Roberto Clemente - Los Angeles Times
