Conversation so far:
What is the undisputed champion in boxing?
In professional boxing, the undisputed champion of a weight class is the boxer who holds world titles from all four of the major sanctioning organizations simultaneously.
What year did Mike Tyson start the journey of Undisputed heavyweight champion?
In 1987, Mike Tyson began his journey of undisputed heavyweight champion in a match against James Smith.

Question: Who did he fight after this?
Self-contained rewrite: Who did Mike Tyson fight after James Smith in 1987?