The sweet science will take center stage on Friday night when Mike Tyson, one of boxing's greatest-ever showmen, returns to the ring. He'll be joined by internet supernova Jake Paul, whose fledgling career as a pugilist has enlivened some and affronted others.

Here’s everything you need to know about Tyson’s current condition and medical history, especially after the highly anticipated fight was postponed in May due to an ulcer.