Everything in David Benavidez’s boxing career was going as well as any 21-year-old could hope.The Phoenix, Ariz. native was the WBC’s reigning super middleweight champion, a promising start for a fighter aiming to be one of the top draws in the sport. Then he lost the belt without even throwing a punch.Last September, the WBC stripped Benavidez of its 168-pound title after he reportedly tested positive for the primary ingredient in cocaine.