YouTuber-turned-prizefighter Jake Paul faces former heavyweight champion Anthony Joshua on Friday in a money-spinning made-for-streaming bout that has triggered alarm across the boxing world.

Just over a year after his much-derided victory over a 58-year-old Mike Tyson, the 28-year-old American Paul will climb into the ring at Miami's Kaseya Center to confront a far younger -- and vastly more dangerous -- opponent in the 36-year-old Joshua.

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