James “Buster” Douglas hits Mike Tyson with a hard right in the face during their world heavyweight title bout at the Tokyo Dome in Japan on Feb. 11, 1990.  Douglas came into the fight shaken by the death of his beloved, doting mother, Lula Pearl, who had died while he was training for the fight.  Then undefeated, undisputed heavyweight champion Mike Tyson lost via knockout in the 10th round to the 42–1 underdog Douglas. (Sadayuki Mikami/AP)

James “Buster” Douglas hits Mike Tyson with a hard right in the face during their world heavyweight title bout at the Tokyo Dome in Japan on Feb. 11, 1990.  Douglas came into the fight shaken by the death of his beloved, doting mother, Lula Pearl, who had died while he was training for the fight.  Then undefeated, undisputed heavyweight champion Mike Tyson lost via knockout in the 10th round to the 42–1 underdog Douglas. (Sadayuki Mikami/AP)

Mike Tyson forces Michael Spinks to take a knee a minute into their fight on June 27, 1988, in Atlantic City, NJ.  It was the first time Spinks had been knocked down in his professional career. Spinks took a count of four before rising, only to be knocked down again shortly thereafter. The fight was over after 91 seconds. (Neil Leifer/SI)
GALLERY: Tyson vs. Spinks: 25th Anniversary

Mike Tyson forces Michael Spinks to take a knee a minute into their fight on June 27, 1988, in Atlantic City, NJ.  It was the first time Spinks had been knocked down in his professional career. Spinks took a count of four before rising, only to be knocked down again shortly thereafter. The fight was over after 91 seconds. (Neil Leifer/SI)

GALLERY: Tyson vs. Spinks: 25th Anniversary