Josh Barnett won the heavyweight title at UFC 36 in 2002 with a TKO victory over Randy Couture. Barnett was stripped of the title four months later due to a failed post-fight drug test from the Couture fight.
After that, Barnett would go to Pancrase, where he won the openweight title with a third-round submission in his first fight with the organization. He would defend the title two times, both submissions, and then he moved on to Pride.
His first two fights in Pride came against Mirko Filipovic. Cro Cop won the first due to an injury just 46 seconds into the first round and the second by unanimous decision.
In 2006 Barnett participated in the Openweight Grand Prix. He won his first two fights with submissions over Alexander Emelianenko and Mark Hunt. His third fight in the tournament was a split-decision victory over Antonio Rodrigo Nogueira. In the finals, he met Cro Cop for a third time, and the kickboxer was once again victorious, this time with a submission to punches.
Barnett's final fight with Pride was a rematch against Minotauro, which Nogueira would win by unanimous decision.
After that, Barnett bounced around to several different organizations, including Sengoku, DREAM, Affliction and Impact FC. He won all six of the fights, beating Hidehiko Yoshida, Jeff Monson, Pedro Rizzo and Gilbert Yvel.
In 2011 Barnett signed up as a participant in the Strikeforce Heavyweight Grand Prix. He won his first two fights in the tournament over Brett Rogers and Sergei Kharitonov, both with arm-triangle submissions.
He would then meet Daniel Cormier in the finals, and DC would take the unanimous-decision victory in a dominating performance.
Barnett had one more fight with Strikeforce—another win by arm triangle—before finally returning to the UFC.
Barnett won his first fight back with a TKO over Frank Mir in less than two minutes. In his most recent fight, Travis Browne knocked him out in just one minute.