Khaliid "Rockstar" Johnson is 5-0 (5 KOs) as a professional. Every win has come inside the distance. He's been in the gym since elementary school, and it shows in how little wasted motion there is in his game. Before turning pro, he logged over 150 amateur bouts, the kind of mileage that teaches a fighter what he's made of long before the paychecks start.

The perfect knockout streak gets the attention, but the amateur pedigree explains it. Khaliid isn't a prospect still figuring things out; he is a fighter who's already put in the rounds most opponents haven't come close to.