Las Vegas, Nevada --- "CHAVEZ-MARTINEZ UNDERCARD PC" ----Fighters: Mike Lee, Joachim Alcine, Guillermo Rigondeaux, Rocky Martinez, Matthew Macklin, Miguel Beltran Jr., Roberto Marroquin and Paul Harness pose during the undercard press conference at the Wynn Las Vegas for the upcoming 'Sold-Out' Mexican Independence Day Middleweight championship battle between undefeated WBC Middleweight Champion Julio Cesar Chavez Jr. and 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.