Derek Hough previews ‘World of Dance’ finale (and dances with John Cena)

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After winning many Mirror Ball trophies on “Dancing with the Stars,” Derek Hough has moved to a judge’s seat on “World of Dance,” on which three finalists will compete in the show’s million-dollar finale Tuesday night. “Going into this final, I’m wiping the slate clean,” Hough tells TODAY before busting some moves with John Cena.