Las Vegas,Nevada ---  Undefeated WBC Middleweight Champion Julio Cesar Chavez Jr.(L) glares at two-division world champion Sergio Martinez (R)  after being interrupted while speaking during the final press conference Wednesday at the Wynn Las Vegas for their upcoming 'Sold-Out' Mexican Independence Day Middleweight championship battle.  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.