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Joshua vs. Usyk: Who was the last undisputed heavyweight champion in boxing? - DraftKings Nation
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Joe Louis, longest-reigning heavyweight champ, was born in Alabama - al.com
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Top ten longest-reigning world champions in boxing revealed, featuring Deontay Wilder and Vasyl Lomachenko
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Nick Aldis has held NWA World Heavyweight Championship for 820 days, he's longest-reigning World Champion of the last decade. : r/SquaredCircle
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klitschko-brothers.com (БРАТСТВО КЛИЧКО) - 🔥💪 👊 Wladimir Klitschko holds the record for the longest combined world championship reign in heavyweight history at 4,383 days! ✊ Klitschko defeated 23 boxers for the world
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