Las Vegas,Nevada --- Undefeated WBC Middleweight Champion Julio Cesar Chavez Jr.(ctr) poses with his father the legendary champion Julio Cesar Chavez Sr.(R) and his Hall of Fame trainer Freddie Roach(L) during media day at the Top Rank gym in preparation for his upcoming Mexican Independence Day Middleweight championship battle against two-division world champion Sergio Martinez. Promoted by Top Rank, Zanfer Promotions and DiBella Entertainment, in association with Wynn Las Vegas, At&T and Tecate, Chavez Jr. vs Martinez will take place Saturday, September 15 at Thomas & Mack Center in Las Vegas, live on HBO Pay Per View. ---- Photo Credit Chris Farina/Top Rank.

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