Claressa Shields is the GWOAT, according to Savannah Marshall. Shields is 'absolutely' up for a rematch in the United States.

"If that's what the fans want, then absolutely that's what we're going to do," Claressa Shields says of a rematch with Savannah Marshall in America. Shields defeated Marshall by unanimous decision to headline the first all-female bill in UK boxing history.

After Claressa Shields won their thrilling undisputed middleweight title fight at The O2 Arena, Savannah Marshall declared her as the greatest female boxer of all time.

Shields was the self-proclaimed GWOAT, but British boxer Marshall now sees him as such after winning Saturday's historic fight by unanimous decision.

As the two headlined the first all-female bill in UK boxing history in front of a sold-out crowd in London, the 27-year-old exacted revenge on Marshall for inflicting her only defeat a decade ago in the amateurs.

Marshall told All Sports immediately after the fight, "Claressa is a brilliant fighter - not as fast as I thought!" She has unquestionably earned the title of "Greatest Woman of All Time."

"I want to thank everyone who purchased a ticket; I truly appreciate it."

"It's incredible that two women sold out The 02. It's incredible, and I want to thank everyone from the bottom of my heart."

Shields, whose slickness and quickness earned her the judges' decision despite Marshall's valiant performance, also reflected on a watershed moment in women's boxing while being grilled by the Brit.

The American also stated that she would be willing to face Marshall again in a rematch in the United States.

Shields is 'absolutely' open to a rematch in the United States.

Shields said of potentially facing Marshall across the pond, "There was a rematch clause if there was a controversial decision, but it was unanimous."

"If that's what the fans want [a rematch in the United States], then we'll do it."

Shields added, tearfully: "I'd like to thank Savannah Marshall and her entire team, as well as the UK fans, for coming because this is a historic moment in women's boxing.

"We're in front of 20,000 people at The O2 Arena.

"It's an incredible moment. It was a memorable night for women's boxing, and I believe it was the fight of the year.

"[Savannah] is a tough competitor, a hard fighter, and has endurance - she hit so hard in rounds 6-10 that I couldn't see out of my right eye.

"I am the superior fighter. I feel like I'm 2-0 against her because I don't think I lost in amateurs, but I guess we're 1-1.

"I know I put in the most effort today and was successful with those combinations. I did what I was supposed to do in training and finished the job.

"I've been working extremely hard for a long time and no one has given me credit."

Nelson says Shields "backed up every boast" Shields, according to Johnny Nelson, deserves credit for not only delivering in the ring, but also for helping to provide the build-up and spectacle that was delivered to a roaring, packed-out O2 Arena.

"I thought she [Shields] was fantastic. She backs up every claim "Nelson stated.

"When it came to Savannah, she was always one step ahead.

"Whether you liked it or not, she did everything you expected of her: she was sharp, fast, hungry, lean, and she fought with purpose.

"She made it a show, even the entrance, arriving in a glittery ball gown in a Bentley that probably only went 200 yards but she made it count.

"Then there's the entrance, the performance, and the speech.

"I actually believe she has gained a lot more fans in the UK, and while there were die-hard Savannah Marshall fans, Savannah herself stated, "The best woman won tonight," and that is exactly what happened.

"It's her business, and these days it's not enough to be a good fighter; you have to have the whole package.

"You must have attitude, character, and provide entertainment for them.

"When people came to see Prince Naseem Hamed fight, they used to go and just watch the entrance, and I think Clarissa thought, 'I'm going to make a business out of this.'

"She had the dancers out there, a good fight, a lot of energy, she's nice and upbeat, and she doesn't mind being the villain or the hero, but she backed up her boast."

Nelson believes Shields has established herself as a "big talent" fighter after a performance that will go down in history.

"She would get two shots off the mark to Savannah's one and was on point with it as well, so she had that concussive punch power," he explained, "but she is a big talent fighter."

"If the opponent is of low level, she will beat them but not impressively."

"If the opponent is at a high level, she will beat them at a high level, but she will step it up as much as she needs to, which is why she has only been beaten by one person when she was a kid at 17 years old."

"I believe she displayed a different side to herself, but she was not concealing anything.

"She said, "This is me, I wear my heart on my sleeve, I do what I do, and I am not afraid to tell you how special I am."

"It's about inspiring others to be confident in who they are," says the author.