IRVING, Texas – Jake Paul is three days out from what will likely be the most-watched bout of his 12-fight boxing career. Looking at him, however, you might not be able to tell. The 27-year-old YouTuber-turned-boxer was all smiles and charisma Tuesday during an open workout at Toyota Music Factory ahead of Friday’s boxing match vs. Mike Tyson.

Jake Paul vs. Mike Tyson will be the biggest combat sports event of the year. Everyone is weighing in on Netflix's boxing debut on Friday, from boxing legends to reigning undisputed champions. Nostalgia is a powerful thing and it has a lot of people riding with former undisputed heavyweight champion "Iron" Mike from a betting perspective.

An early end to the fight between Mike Tyson and Jake Paul favors Tyson, but a longer fight favors Paul. Experts see other possibilities, too.