For nearly four years, UFC middleweight champion Anderson Silva has ruled the 185-pound weight class with an iron fist. On August 7th, at the Oracle Arena in Oakland, California, he will look to add to his record six title defenses when he takes on the one man brash enough to call him out, number one contender Chael Sonnen. This championship bout, which is the main event of UFC 117: SILVA vs. SONNEN presented by Tequila Cazadores, headlines the first UFC® event in Oakland.