Saul "Canelo" Alvarez and Jermell Charlo both weighed in at 167.4 pounds on Friday ahead of their duel for Alvarez's undisputed super middleweight world titles.Charlo, himself the undisputed junior middleweight world champion, will be at his heaviest fighting weight ever as he steps up to the 168-pound (76.2 kg) division for the first time aiming to grab Alvarez's IBF, WBA, WBC AND WBO belts.