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. Buster Douglas Mike Tyson vs. Buster Douglas Mike Tyson vs. Buster Douglas, billed as "Tyson Is Back!", was a professional boxing match that occurred at the Tokyo Dome on February 11, 1990. The event is historically significant, as the then-undefeated, undisputed heavyweight champion Tyson lost by knockout to the 42–1 underdog Douglas. The fight is widely considered one of the biggest upsets in sports history. Going into the fight, Mike Tyson was the undefeated and undisputed heavyweight champion of the world. He held the WBC, WBA, and IBF titles. Despite the several controversies that marked Tyson's profile at the time, such as