Mike Tyson vs. Brian Nielsen Originally, Tyson was rewarded with a technical knockout victory, but it was later changed to a no-contest in January 2001 after a post-fight drug test revealed that Tyson had tested positive for marijuana. Just days before Tyson's positive test became known to the public, he was also issued a three-month suspension by the State of Michigan, which the Nevada Athletic Commission agreed to uphold, though the suspension had little effect on Tyson's boxing schedule as he had already announced his intentions to take those three months off. After serving the suspension, Tyson's next fight was initially going to be against
Mike Tyson vs. Marvis Frazier before unleashing two consecutive uppercuts, the second of which knocked Frazier unconscious. Tyson then landed several more blows before Frazier fell to the canvas, slumped against the ropes. Referee Joe Cortez began to count to ten, but as Frazier was clearly unresponsive, stopped the count at five and ended the fight. The fight would last only 30 seconds, becoming the quickest victory of Tyson's professional career. Mike Tyson vs. Marvis Frazier Mike Tyson vs. Marvis Frazier was a professional boxing match contested on July 26, 1986. The fight is notable for being the quickest knockout victory of Tyson's professional career,