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Roberto Clemente Day celebrated around MLB in 2023
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Mets honor Roberto Clemente at Citi Field
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Roberto Clemente: A Tribute to the Great One
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Opening Day in MLB: New No. 21 patches, NL DHs and Guardians
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MLB Clemente Award winners wear his 21 on caps for careers
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Braun, Yelich, Moustakas pay tribute to Skaggs with special jersey names
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New York Yankees retired Paul O'Neill's No. 21 jersey
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Pittsburgh Pirates, New York Mets players, coaches to all wear No. 21 on Roberto Clemente Day - ESPN
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All Pirates Wearing #21, Rest of MLB Wears Patches in Honour of Roberto Clemente – SportsLogos.Net News
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Why are MLB players wearing 21 on their sleeve? - Quora
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Dodgers to honor award nominee Justin Turner Wednesday
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Detroit Tigers celebrate 21st annual Negro Leagues Weekend this weekend
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The Curious Case Of Aaron Judge Wearing Triple Numbers
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2022 Positional Power Rankings: Center Field
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After Jackie Robinson, MLB integration was halting - The Washington Post