IBF welterweight champion Errol "The Truth" Spence is planning to dish out a one-sided beating to WBC champion "Showtime" Shawn Porter.

The two are scheduled to collide in a unification, in the main event of a FOX Sports Pay-Per-View event on Saturday, September 28 from Staples Center in Los Angeles.

In his last fight, Spence picked up his biggest high profile victory by dominating four-division champion Mikey Garcia in a FOX Sports PBC Pay-Per-View in March.

Garcia moved up two weight divisions to take the fight. Porter is physically much bigger and stronger, but Spence is not concerned.

"I already have it in my head that I want to punish Shawn and get an impressive knockout," said Spence. "Nothing he can say can stop me. That's my mentality come September 28. I have a lot of dog in me, I'm a guy who always comes to fight. I'm going to do what it takes to win."

Now the plan for Spence is to close the show in dramatic fashion. He wants to punish Porter slowly, round after round, until he secures the knockout win. He expects Porter to fight in his usual style, by bulldozing forward with big punches.

"This fight ends in a spectacular knockout by me. I'm going to punish him. I'm going to beat him up mentally and physically. I'm going to have him distraught in the ring. Then, I'm finishing him," Spence said.

"He doesn't have the skills to beat me. I'm not worried about Shawn boxing like he did with Ugas, or what he did with Danny Garcia. He's going to have no choice but to come forward."