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Uniform number (Major League Baseball) - Wikipedia
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Roberto Clemente Day celebrated around MLB in 2023
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Roberto Clemente Award
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Happy Roberto Clemente Day! One of the best things MLB does in my opinion. : r/baseball
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How players are using uniform numbers to break MLB's unwritten rules - ESPN
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WATCH: Aaron Judge pays tribute to Roberto Clemente by wearing custom, “21” cleats - Overtime Heroics
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Remembering Brooks Robinson: A tribute to #5, my Hall of Fame HERO
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How MLB Is Celebrating Roberto Clemente Day During 2022 Season
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Pirates, MLB honour 'the Great One' Roberto Clemente
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Pirates will honor Roberto Clemente by wearing his No. 21 on their jerseys - ESPN
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Some MLB Players Wearing #21, All Wearing 21 Patches Today for Roberto Clemente Day – SportsLogos.Net News