In the Japanese boxing manga and anime series Hajime no Ippo (Fighting Spirit), the title character Makunouchi

Question

In the Japanese boxing manga and anime series Hajime no Ippo (Fighting Spirit), the title character Makunouchi Ippo is taught the "Gazelle Punch" which is a recreation of the leaping blow X used to defeat Johansson in their first rematch fight. He is a character in the popular Fight Night Round 3 Video Game.X is mentioned in the Billy Joel song "We didn't Start the Fire": "Liston beats X."

Answer 1

I assume that you are asking who that punch was modeled after for the video game, which is who "X" is.  The answer is Floyd Patterson- the former 2-time heavyweight champion of the world.