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. Tyrell Biggs Heavyweight champions, Riddick Bowe and Lennox Lewis, though he was defeated by both men by way of technical knockout. This would prove to be the last Heavyweight title fight to be scheduled for 15 rounds. Mike Tyson vs. Tyrell Biggs Mike Tyson vs. Tyrell Biggs, billed as "The Clash for the Crown", was a professional boxing match contested on October 16, 1987 for the Undisputed Heavyweight Championship, which consists of the WBA, WBC and IBF Heavyweight Championships. According to Mike Tyson's Book "Undisputed Truth", Tyrell Biggs dissed Tyson in 1984. When Tyson came to wish the American Boxing Olympic team