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MGM Grand security try to to separate UFC light heavyweight champion Jon Jones (top) and challenger Daniel Cormier after the two started fighting during a UFC press conference at the MGM Grand Monday Aug. 4, 2014.

Steve Marcus

MGM Grand security try to to separate UFC light heavyweight champion Jon Jones (top) and challenger Daniel Cormier after the two started fighting during a UFC press conference at the MGM Grand Monday Aug. 4, 2014.