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September 21, 2001: Piazza homer leads Mets in New York City's first baseball game after 9/11 – Society for American Baseball Research
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Mike Piazza - Wikipedia
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Mike Piazza's emotional post-9/11 home run Relive that unforgettable night in Queens
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Mike Piazza with the NY Mets - Mets History
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Is this the core four of the Mets franchise? - Amazin' Avenue
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Mike Piazza: The M&F Interview - Muscle & Fitness
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Baseball 101: Comebacks - Newsday
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How the Mets honored 9/11 heroes amid the coronavirus pandemic
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Mike Piazza to have his Number Retired
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Mike Piazza 'honored' post-9/11 homer for Mets will live on
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History of the New York Mets - Wikipedia
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Mike Piazza with the NY Mets - Mets History
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Baseball 101: Comebacks - Newsday