Sonnen dominating from inside Silva's guard. In the fifth round, Silva slipped after being tagged by Sonnen's left hook and the challenger took advantage by once again establishing a top position and delivering strikes to Silva. With about two minutes left in the round, Silva was able to lock up a triangle armbar on Sonnen, forcing Sonnen to submit at 3:10 of Round 5. In the fight, Sonnen had struck Silva more times than Silva had been hit thus far in his entire UFC career. According to CompuStrike, in his first 11 UFC fights, Silva had been hit 208 times. On 7 August Sonnen had landed a total of 289 strikes. After the bout it was revealed that Sonnen would have won a judges' decision. All three judges had Sonnen marked as the winner of all four rounds, judges Nelson Hamilton and Dan Stell had Sonnen taking Round 1 10–8, as well as Hamilton awarding the challenger another 10–8 total in Round 3. Silva later claimed to have gone into the fight with a cracked rib and that a doctor advised him not to fight. Dana White announced that Sonnen would get a rematch upon Silva's return. Following the fight the California State Athletic Commission confirmed that Chael Sonnen tested positive for synthetic testosterone, with his test having revealed a high testosterone to epitestosterone ratio, indicative of testosterone replacement therapy. The promised rematch was revoked after the issue with his testosterone ratio came to light, however, after Sonnen came back and won two straight fights, Dana White scheduled the rematch. Silva faced Vitor Belfort on 5 February 2011, at UFC 126. Belfort was expected to face Yushin Okami on 13 November 2010, at UFC 122, but was replaced by Nate Marquardt. After a "feeling out" period of about two and a half minutes in the first round, Silva and Belfort started to trade strikes. Silva landed a front kick to Belfort's jaw and followed up with punches to the grounded challenger. Referee Mario Yamasaki stopped the fight at 3:25 into the first round. With the win Silva handed Belfort his first KO loss in 28 career fights and extended his record streak of title defenses to eight. Silva then faced Yushin Okami on 27 August 2011, at UFC 134. He defeated the Japanese middleweight by TKO at 2:04 of round 2, displaying skilled head movement and accurate striking. His record