San Antonio, Texas ---  "RUBIO: STRONG,POWERFUL"   --- #1 Ranked Marco Antonio Rubio hits the mitts during media day at the Jesse James Leija Gym in San Antonio,Texas, Tuesday for his upcoming world title defense against undefeated WBC World Middleweight Champion Julio Cesar Chavez Jr. ,  Saturday,Feb. 4, televised live on HBO World Championship Boxing from the Alamodome in San Antonio,Texas. Promoted by Top Rank, in association with Zanfer Promotions, All Star Boxing and Tecate, Chavez Jr. takes on Rubio and Nonito Donaire battles Wilfredo Vasquez Jr. in the other co-main event. Photos by Chris Farina/Top Rank.