Anderson Silva, left, and Chael Sonnen battle it out during their UFC 148 middleweight championship fight at the MGM Grand Garden Arena Saturday, July 7, 2012 in Las Vegas. Silva won with a TKO in the second round. (AP Photo/David Becker) (AP2012)
Anderson Silva, left, and Chael Sonnen battle it out during their UFC 148 middleweight championship fight at the MGM Grand Garden Arena Saturday, July 7, 2012 in Las Vegas. Silva won with a TKO in the second round. (AP Photo/David Becker) (AP2012)
Anderson Silva and Chael Sonnen battle it out during their UFC 148 middleweight championship fight at the MGM Grand Garden Arena Saturday, July 7, 2012 in Las Vegas. Silva won with a TKO in the second round. (AP Photo/David Becker) (AP2012)
Anderson Silva, left, and Chael Sonnen battle it out during their UFC 148 middleweight championship fight at the MGM Grand Garden Arena Saturday, July 7, 2012 in Las Vegas. Silva won with a TKO in the second round. (AP Photo/David Becker) (AP2012)
Chael Sonnen gives Anderson Silva an arm to the face during their UFC 148 middleweight championship fight at the MGM Grand Garden Arena Saturday, July 7, 2012 in Las Vegas. Silva won with a TKO in the second round. (AP Photo/David Becker) (AP2012)
Anderson Silva punches Chael Sonnen during the second round of their UFC 148 middleweight championship fight at the MGM Grand Garden Arena Saturday, July 7, 2012 in Las Vegas. Silva won with a TKO. (AP Photo/David Becker) (AP2012)
Anderson Silva, right, and Chael Sonnen battle it out during their UFC 148 middleweight championship fight at the MGM Grand Garden Arena Saturday, July 7, 2012 in Las Vegas. Silva won with a TKO in the second round. (AP Photo/David Becker) (AP2012)
Anderson Silva gets ready before 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 in the second round. (AP Photo/David Becker) (AP2012)
Anderson Silva and Chael Sonnen battle it out during their UFC 148 middleweight championship fight at the MGM Grand Garden Arena Saturday, July 7, 2012 in Las Vegas. Silva won with a TKO in the second round. (AP Photo/David Becker) (AP2012)
Anderson Silva celebrates after the referee stop 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) (AP2012)
Anderson Silva celebrates after the referee stop 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) (AP2012)
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) (AP2012)