New York, NY --- Undefeated WBC Middleweight Champion Julio Cesar Chavez Jr. and two-division world champion Sergio Martinez during a photo shoot in New York. 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 Ed Diller - Top Rank /DiBella Entertainment.