Why Saturday's fight is vital for Julio Cesar Chavez Jr.

Julio Cesar Chavez Jr. has every incentive he needs to put on a great performance on Saturday when he meets Bryan Vera at the Alamodome in the main event of an HBO-televised card in San Antonio. Chavez is coming off a lackluster victory over Vera in September, a bout in which he struggled mightily to make weight. He was shunned by fans in that fight, who unexpectedly failed to turn out in big numbers for the match at the StubHub Center in Carson, Calif. Fans seemingly have gotten tired of his ac…