Sergio Martinez vows to knock out Julio Chavez Jr

Sergio Martinez has vowed to inflict a first defeat on Julio Chavez Jr when the pair clash on Saturday night.

The pair will fight for Chavez Jr's WBC Middleweight title and Martinez has warned Chavez his grudge his personal, claiming that he benefits from the legendary status of his father Julio Chavez.

"It is personal. Not only do I want the title, but I have wanted to fight Chavez for a long time," said Martinez.

"The only reason he is world champion is because he is Julio Cesar Chavez Jr, the son of the legend and his mouth is so big - even bigger than his own brain and he's talking too much.

"The speed and the power that I will deliver to Chavez will be enough to knock him out. I will not wait for the judges."

The pair will square off in the Thomas & Mack Center in Las Vegas, Nevada.