WBC, IBF, WBA middleweight champion Claressa Shields is about a month away from her long-awaited grudge match with WBO champion Savannah Marshall.

The undisputed fight takes place on September 10 at London's O2 Arena.

Back in 2012, Marshall decisioned Shields in the amateurs. That bout makes the only time Shields has tasted defeat in a boxing ring.

Shields move forward to win gold at two Olympic games. Marshall did not achieve the same level of accolades - and Shields has also reached bigger heights as a pro with unified title runs in three weight classes.

"I've said for a long time, 2012, that I was the one who everyone would remember for life whether I continue boxing or not," Shields told Sky Sports.

"But the fact I continued and won the Olympics again and turned pro, and I'm one of the women who changed the game as far as equal pay, equal promotion and we're fighting to get equal fight time. I'm happy it's coming to fruition, that I have this opportunity and I have a great dance partner. I'm looking forward to crossing the pond and fighting against Savannah Marshall.

"It takes two great fighters to get in there and make a show. So, I'm coming over there to put on a show and show the world I am what I say I am - I'm the Greatest Woman Of All Time."

While the back and forth banter has continued to play out between the two boxers, Shields is also grinding hard in camp with head trainer John David Jackson.

"It's all about discipline," Shields said. "The blood, sweat and tears come with the game, but I enjoyed the sweat, I enjoy the blood - sometimes rather coming from my opponent - and there's some crying involved, but not when you're enjoying it.

"That's why I come to Miami, because it's different scenery. Yeah, you've got clubs and beaches and bars, but I only go to the beach and the gym. I go to the track and run some trail, but I'm not really a big party person.

"I'm happy for the opportunity and just to be able to have that platform, especially where I come from, and to be dubbed as the biggest women's fight in boxing history means a lot."