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The upcoming celebrity boxing match between Blueface and former NBA star Nick Young isn't too chummy, and won't be very long -- the "Thotiana" rapper is vowing to put Nick to sleep early!

Make no mistake about it, Blueface has already won the July 30 bout in his mind, because he tells TMZ Hip Hop ... "The Famous Cryp is about to be even more famous ... Nick's going down in the 3rd!"

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