WBC, WBA and IBF junior middleweight world champion Jermell Charlo has promised to punish unbeaten Brian Castano, who holds the WBO’s version of the world title.

The two champions will collide in a full division unification on Saturday, July 17, in a Showtime televised main event from the AT&T Center in San Antonio, Texas.

The winner will become the first four belt champion in the history of the junior middleweight division.

Charlo (34-1, 18 KOs) became a unified champion last September when he knocked out Jeison Rosario in the eight round to add the WBA, IBF titles to his collection.

Before that fight, Charlo avenged the only loss of his career, and reclaimed the WBC title, with a knockout of Tony Harrison in the eleventh round.

Now only Castano (17-0-1, 12 KOs) stands in the way of unifying the entire weight class.

Castano capture the WBO title in February when he dominated Patrick Teixeira over twelve rounds to secure a unanimous decision.

“I’m more than excited for July 17. I have so much potential and I’m just doing everything I can to get better and do better day by day. I’m hungrier than ever because I know I’m on the verge of capturing this undisputed title and doing something that nobody has ever done before at 154 pounds,” Charlo said.

“There’s nobody out there that’s as fast, strong and elusive as me. Castano doesn’t possess anything I haven’t seen before, and we’ll see if he can take my power and the pain I’ll bring. But there’s nothing that worries me about this fight. I’m training super hard and aggressive and just taking it one day at a time. I’m so ready for this and more than likely he’ll walk into every shot I throw.”