'Maravilla' Martínez derrota a Julio César Chávez Jr.

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  Sergio Martinez waves to the crowd after defeating Julio Cesar Chavez Jr. for the WBC middleweight title, Saturday, Sept. 15, 2012, in Las Vegas. Martinez won by unanimous decision. Chris Farina - Top Rank

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  Sergio Martinez(R) wins a 12-round unanimous decision over Julio Cesar Chavez Jr. (L), Saturday, at Thomas & Mack Center in Las Vegas. Chris Farina - Top Rank

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  Sept 15, 2012, Las Vegas,Nevada --- Sergio Martinez(R) wins a 12-round unanimous decision over Julio Cesar Chavez Jr. (L), Saturday, at Thomas & Mack Center in Las Vegas. Chris Farina - Top Rank

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  Sergio Martinez(R) wins a 12-round unanimous decision over Julio Cesar Chavez Jr. (L), Saturday, at Thomas & Mack Center in Las Vegas. Martinez was knocked down in the 12 round shown here. Chris Farina - Top Rank

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  Sergio Martinez(L) wins a 12-round unanimous decision over Julio Cesar Chavez Jr. (R), Saturday, at Thomas & Mack Center in Las Vegas. Chris Farina - Top Rank

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  Sergio Martinez(L) wins a 12-round unanimous decision over Julio Cesar Chavez Jr. (R), Saturday, at Thomas & Mack Center in Las Vegas. Chris Farina - Top Rank

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  Sergio Martinez waves to the crowd after defeating Julio Cesar Chavez Jr. for the WBC middleweight title, Saturday, Sept. 15, 2012, in Las Vegas. Martinez won by unanimous decision. Julie Jacobson / AP

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  Julio Cesar Chavez Jr., left, exchanges punches with Sergio Martinez during the WBC middleweight title fight, Saturday, Sept. 15, 2012, in Las Vegas. Martinez won by unanimous decision. Julie Jacobson / AP

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  Julio Cesar Chavez Jr., left, lands a punch against Sergio Martinez during the WBC middleweight title fight, Saturday, Sept. 15, 2012, in Las Vegas. Martinez won by unanimous decision. Julie Jacobson / AP

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  Julio Cesar Chavez Jr., center, looks down at Sergio Martinez after knocking him down for the second time in the 12th round during the WBC middleweight title fight, Saturday, Sept. 15, 2012, in Las Vegas. Martinez won by unanimous decision. Julie Jacobson / AP

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  Julio Cesar Chavez Jr., center, knocks Sergio Martinez to the mat for the second time in the 12th round during the WBC middleweight title fight, Saturday, Sept. 15, 2012, in Las Vegas. Martinez won by unanimous decision. Julie Jacobson / AP

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  Sergio Martinez, right, lands a punch against Julio Cesar Chavez Jr. during the WBC middleweight title fight, Saturday, Sept. 15, 2012, in Las Vegas. Martinez won by unanimous decision. Julie Jacobson / AP

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  Julio Cesar Chavez Jr., right, lands a punch against Sergio Martinez during the WBC middleweight title fight, Saturday, Sept. 15, 2012, in Las Vegas. Martinez won by unanimous decision. Julie Jacobson / AP

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  Sergio Martinez, right, throws punches to the body of Julio Cesar Chavez Jr. during the WBC middleweight title fight, Saturday, Sept. 15, 2012, in Las Vegas. Martinez won by unanimous decision. Julie Jacobson / AP

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  Sergio Martinez falls to the mat as referee Tony Weeks directs Julio Cesar Chavez Jr. to his corner in the 12th round during the WBC middleweight title fight, Saturday, Sept. 15, 2012, in Las Vegas. Martinez won by unanimous decision. Julie Jacobson / AP

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  Sergio Martinez, right, reacts as the bell rings to end the 10th round against Julio Cesar Chavez Jr. during the WBC middleweight title fight, Saturday, Sept. 15, 2012, in Las Vegas. Martinez won by unanimous decision. Julie Jacobson / AP