Las Vegas,Nevada --- Undefeated WBC Middleweight Champion Julio Cesar Chavez Jr.(R) works out at his home in Las Vegas 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. ---- Photos by Chris Farina/Top Rank.