Tickets to the Chávez Jr. vs. Martinez world middleweight championship event on September 15 at the Thomas & Mack Center in Las Vegas will go on sale today at 3:00 p.m. ET / Noon PT. Priced at $600, $400, $200, $100, $75, $50 and $25, they can be purchased at the Thomas & Mack Center box office and Town Square Las Vegas Concierge. Tickets can also be purchased online at www.unlvtickets.com. To charge by telephone call (702) 739-FANS.