MLB allows more players to wear No. 21 to honor Roberto Clemente
MLB Clemente Award winners wear his 21 on caps for careers
Ríos, Hernández to wear uniform No. 21 on Roberto Clemente Day, by Rowan Kavner
Hot take: Roberto Clemente Day should be just like Jackie Robinson Day💯⚾️ : r/mlb
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Making a case to retire No. 21 league wide
Nats DH Cruz, other Clemente Award winners wear '21' on caps - The San Diego Union-Tribune