Julio Cesar Chavez Jr., center, lands a punch against Sergio Martinez in the 12th round as referee Tony Weeks, left, looks on during the WBC middleweight title fight, Saturday, Sept. 15, 2012, in Las ... more 

Julio Cesar Chavez Jr., center, lands a punch against Sergio Martinez in the 12th round as referee Tony Weeks, left, looks on during the WBC middleweight title fight, Saturday, Sept. 15, 2012, in Las Vegas. Martinez won by unanimous decision. (AP Photo/Julie Jacobson) less