Hollywood, Ca. --- "SPARRING WAR" --- (L-R) #1 Contender Julio Cesar Chavez Jr., Culiacan, Mexico and US Olympian, undefeated #1 ranked Vanes "The Nightmare" Martirosyan, Glendale, Ca spar during media day at the Wildcard Boxing Club Wednesday. Chavez Jr.is preparing for his upcoming WBC World Middleweight title fight against unbeaten WBC Middleweight Champion Sebastian Zbik of Germany and Martirosyan takes on Mexican knockout artist Saul Roman in a world title elimination bout. Zbik vs Chavez Jr. is promoted by Top Rank in association with Zanfer Promotions, Universum Media Network, Tecate and Staples Center and will take place on Saturday, June 4 at the Staples Center in Los Angeles and be televised on HBO Boxing After Dark. Photo Credit - Chris Farina/Top Rank