WBO junior middleweight champion Brian Castano is aware of the story. For the first time there will be a unified and absolute champion at 154 pounds when he faces Jermell Charlo on July 17.

Argentina, a nation with a rich history in boxing, has never had an undisputed king in the four belt era.

Charlo, who holds the WBA, WBC and IBF titles, is the heavy favorite to win this Saturday in San Antonio, Texas.

In his last big test, Castano fought Cuba's Erislandy Lara to a twelve round draw. This time around, he doesn't want to leave any room for doubt.

He's not concerned with the scenario of entering hostile territory to fight Charlo in his backyard, with a venue likely filled with local fans who are going to offer frenzied support to the local man.

"[This] was the fight I was looking for before I faced Patrick Teixeira. We were already pushing for it. First Teixeira and then we looked for Charlo. It's historic for my country and for all Latinos. I'm at my best," Castano told George Ebro.

"My style is to throw a lot of shots and apply a lot of pressure. Obviously, we're working on that and the different forms of fighting. I also have to box and counterpunch. I know Charlo is strong and is going to wait for me to come forward all the time. He's going to want to counterpunch me. I'll be careful to watch out for his shots. Every fight is a new challenge.

"I was always the B-side in every fight in the United States. This is one of those fights, he has everything in his favor, promoter, location, fans, venue, but it's also more pressure on him and I'm going to take advantage of that.''