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Anderson Silva celebrates after the referee stopped the fight in the second round during his UFC 148 middleweight championship fight against Chael Sonnen at the MGM Grand Garden Arena Saturday, July 7, 2012 in Las Vegas. Silva won with a TKO. (AP Photo/David Becker)

Anderson Silva celebrates after the referee stopped the fight in the second round during his UFC 148 middleweight championship fight against Chael Sonnen at the MGM Grand Garden Arena Saturday, July 7, 2012 in Las Vegas. Silva won with a TKO. (AP Photo/David Becker)