Trainer Panama Lewis and undefeated heavyweight prospect Timur Ibragimov take a break during their workout at the IBA Gym in Las Vegas. Ibragimov faces undefeated prospect Calvin Brock on Saturday in the Roman Amphitheater at Caesars Palace. Lewis, who is banned from ringside in the United States due to a 1983 incident involving glove tampering, can attend the Brock-Ibragimov fight but he cannot be in the corner of Ibragimov. In the co-main event, undefeated welterweight sensation Joel Julio challenges undefeated welterweight contender Carlos Quintana in a WBA welterweight eliminator bout. HBO will televise these showdowns of contenders in an event that is appropriately named “Undefeated . . . But Not For Long.” The promoter is Main Events