By Dan Ambrose: Sergio Martinez (49-2-2, 28 KO’s) stuck with his theme that WBC middleweight champion Julio Cesar Chavez Jr. (46-0-1, 32 KO’s) is an undeserving champion who wouldn’t be a champion if not for his famous father Julio Cesar Chavez Jr. in a international media conference call on Wednesday to promote their September 15th fight at the Thomas & Mack Center in Las Vegas, Nevada.

Martinez said this as quoted by Fightnews.com “I will beat him [Chavez Jr.], he cannot beat me. He doesn’t deserve to be world champion. The reason is become he’s the son of a legend.”

Chavez Jr. has improved a great since beating WBC paper champion Sebastian Zbik last year. However, it’s hard to really tell whether Chavez Jr’s success is from his skills getting better or simply because he seems to be putting on more weight to the point where he’s facing middleweights while weighing as much as a cruiserweight. Is it Chavez Jr’s skills that are enabling him to beat the guys he’s been facing or is it his huge weight advantage each time he fights? It’s hard to say. We won’t know until Chavez Jr. is no longer a middleweight and is forced to fight guys his own weight at super middleweight or light heavyweight.

If Chavez Jr. can succeed against guys like Andre Ward, Mikkel Kessler, Carl Froch, Adonis Stevenson and Chad Dawson at super middleweight and light heavyweight, then you can say it’s talent. Until then, a lot of boxing fans will see it as Chavez Jr beating guys due to his skills at melting down from 180 to fight against smaller middleweights.

Martinez has the talent and the power to beat Chavez Jr. even if he’s out-weighed by 20 pounds on September 15th. Martinez’s speed and mobility will likely nullify Chavez Jr’s weight advantage and turn it into a negative for the son of Chavez Sr. If Martinez had limited mobility like the guys that Chavez Jr. has beaten since capturing the World Boxing Council belt in 2011, then Martinez might be in big trouble on the 15th of September, but he’s not. Martinez isn’t going to fight like his feet are stuck in flypaper and he’s not going to be trapped by fighting in a small ring that favors the slow moving Chavez Jr.