As a result of his win, Ruiz is now the unified heavyweight champ of the world.
Many Twitter accounts are claiming the upset to be the biggest in the sport. To me, I'd still have to go with Mike Tyson .vs. James 'Buster' Douglas from 1990. This is mainly because of how Tyson was more of a household name back then.
This is not to take anything away from Anthony Joshua and certainly not from Ruiz.
It's definitely the second-best upset from where I sit.
It sure would be interesting if Ruiz manages to win the rematch that is currently being planned for the near future.