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A member of the UFC Hall of Fame and a legend in the sport, Randy Couture will likely be remembered as one of the greatest fighters of all time. It's not because he was incredibly dominant, but because he was constantly the underdog, facing significantly larger, younger fighters, all while remaining an extremely humble individual.
Couture retired just before his 48th birthday. The fact that he was able to compete at the highest level that late into his career is impressive in and of itself.
"The Natural" first became champion in 1997 at UFC Japan, defeating Maurice Smith. After being stripped of the title due to contact disputes, he regained it at UFC 28 by defeating Kevin Randleman. Couture then made two successful defenses, both against Pedro Rizzo. He then lost his title to Josh Barnett.
After a run as the UFC Light Heavyweight Champion, Couture returned to the heavyweight division, defeating the then-dominant Tim Sylvia. He then made another successful defense of his title by defeating Gabriel Gonzaga.
Brock Lesnar then took the title from Couture at UFC 91.