In his next fight at UFC 73 on July 7, 2007, Silva successfully defended his title against Nate Marquardt , winning by TKO at 4:50 in the first round. Three months later, on October 20, 2007, at UFC 77 , Silva fought a title defense rematch against Rich Franklin, in Franklin's hometown of Cincinnati , Ohio, at the . Bank Arena .  Silva defended his belt by defeating Franklin via TKO in the 2nd round. On March 1, 2008, at UFC 82 Silva fought Pride Middleweight champion Dan Henderson , in a title unification bout (UFC and Pride titles on the line). Henderson was believed to have the edge on the ground, having competed in the 1992 and 1996 Summer Olympics in Greco-Roman wrestling . Silva defended his title by defeating Henderson via rear naked choke in the 2nd round. At UFC Fight Night: Silva vs. Irvin on July 19, 2008, Silva made his debut at Light Heavyweight (205 lb (93 kg)) in a bout against James Irvin . Silva won via KO due to strikes in 1:01 of the first round after catching Irvin's attempted leg kick with his left arm and delivering a straight right that dropped Irvin to the mat, Silva then finished a prone Irvin with a blitz of punches to the head.     Irvin later tested positive for methadone and oxymorphone.