Sometimes in MMA, a finish can be so smooth that the winning fighter doesn’t even feel the need to celebrate it.

The Ukrainian cruiserweight convert has in five years eclipsed the accomplishments of any heavyweight since the ’90s.

Once upon a time, the world heavyweight champ was the most famous man on Earth. But other than hardcore fight fans, nobody can even pick Oleksandr Usyk out of a lineup. And he’s held the belt for ...