Las Vegas ,Nevada --- Ryan Burton catches former World Lightweight champion Brandon Rios of Oxnard,Ca. and one-time interim world champion Diego Chaves of Buenos Aires weigh in ( Rios 147 lbs, Chaves 148 lbs) for their upcoming 10-round welterweight main event , Saturday, August 2 in the Chelsea at The Cosmopolitan of Las Vegas and televised on HBO Boxing After Dark®. Promoted by Top Rank®, in association with Tecate, tickets to the Rios vs. Chaves / Vargas vs. Novikov world championship event are available for purchase at

or through Ticketmaster at (800) 745-3000 and

. Tickets are priced at $50, $75, $100, $150 and $200.