WATCH: MMA legend Demetrious Johnson knocked out by vicious and legal knee in ONE fight | CBS Sports Headlines WATCH: MMA legend Demetrious Johnson knocked out by vicious and legal knee in ONE fight Adriano Moraes became the first man to ever stop Johnson in his professional career ESN FeedsThis … Continue reading WATCH: MMA legend Demetrious Johnson knocked out by vicious and legal knee in ONE fight