Las Vegas, Nevada ---  (L-R) Undefeated WBC Middleweight Champion Julio Cesar Chavez Jr. and two-division world champion Sergio Martinez weigh in (Chavez Jr 158 lbs, Martinez 159 lbs) Friday 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.