Oxnard,Ca.  ---  Former world champion Brandon "Bam Bam" Rios,Oxnard,Ca. works on strength and conditioning Thursday for his upcoming World Lightweight title fight against Cuban gladiator and WBA interim lightweight champion Richard Abril on Saturday, April 14 at the Mandalay Bay in Las Vegas, live on Pay Per View. Also on this championship double-header telecast is Juan Manuel Marquez, who will go for a historic fourth world title in as many different weight divisions when he takes on WBO European junior welterweight champion Sergey Fedchenko for the vacant WBO interim 140-pound world title. Marquez-Fedchenko will take place in Mexico City. --- Photos by Chris Farina/Top Rank.