In celebration of its 30th anniversary, Showtime Championship Boxing presents one of the most famous upset victories in boxing history: Mike Tyson's first heavyweight title defense - and sta... Read allIn celebration of its 30th anniversary, Showtime Championship Boxing presents one of the most famous upset victories in boxing history: Mike Tyson's first heavyweight title defense - and staggering loss - against Evander Holyfield.In celebration of its 30th anniversary, Showtime Championship Boxing presents one of the most famous upset victories in boxing history: Mike Tyson's first heavyweight title defense - and staggering loss - against Evander Holyfield.