Is Mike Tyson unbeatable? On February 10, 1990, in the heavyweight championship fight in Tokyo, this boxer knocked out Mike Tyson in the tenth round, the only fighter ever to defeat Tyson for the heavyweight boxing crown. Who was he?

By 1990, "Iron" Mike Tyson was more than a boxer; he was a cultural phenomenon. As the undefeated and undisputed heavyweight champion, he was widely considered the "Baddest Man on the Planet," dispatching opponents with terrifying speed and power. His championship defense in Tokyo against a little-known challenger was viewed by most as a mere formality, a simple tune-up before bigger fights. Las Vegas casinos barely even offered betting lines on the fight, with some listing the challenger as a staggering 42-to-1 underdog.

That challenger was James "Buster" Douglas. While a competent boxer, he was not considered to be in Tyson's league. However, Douglas was fighting with a heavy heart and incredible motivation. Just 23 days before the fight, his mother, who had always believed in him, passed away. He entered the ring with a focus and determination no one had seen from him before, using his superior reach and a disciplined jab to control the pace of the fight from the early rounds.

The fight culminated in one of the most shocking moments in sports history. In the tenth round, Douglas stunned a weary Tyson with a ferocious combination, ending with a brutal uppercut that sent the champion to the canvas for the first time in his professional career. Unable to beat the count, Tyson lost his titles, and his aura of invincibility was shattered. Douglas's victory remains the benchmark for monumental sporting upsets and secured his place in history as the only man to defeat a prime Mike Tyson for the heavyweight crown.