Tom Grennan has just performed as we take a break before the two world-title fights that are topping tonight's historic event in London.

First up Mikaela Mayer, who holds the WBO, IBF and Ring magazine super-featherweight titles, is facing fellow American Alycia Baumgardner.

And now it's time for some Sweet Caroline, karaoke style at the O2.

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And here is Natasha Jonas' prediction: "It's a tough fight for both girls. Neither of them have fought someone of that calibre. I can see Claressa build up a big lead. She's explosive, fast, likes to be in the pocket and throws a lot of volume of punches.

"But Sav will eventually land. And I don't think Claressa has been hit by anyone like Sav. When Sav does land, people don't get back up.

"She's got one of the most devastating knockout reels in female boxing. I think Claressa may get a little lackadaisical and Sav will land."

Natasha Jonas
WBO and WBC super-welterweight champion

An undisputed clash between two elite fighters, on a card featuring an all-female cast - it does not get much bigger, or better, than that.

When American Christie Martin fought on a Mike Tyson undercard in 1996, it was huge for women's boxing because nobody had ever had a platform like that before.

Then earlier this year, Katie Taylor and Amanda Serrano sold out New York's Madison Square Garden in a historic moment for the sport.

Now we have another game-changing event which will redefine women's boxing.

Saturday night will leave behind a legacy. It will set the tone for everything else which will follow in the years to come.

The whole card is the biggest thing to happen in British boxing for women. When you get a crest of wave like we have now, you have to ride it, and enjoy it.

Click here for more from Natasha.

And there it is, Timea Belik is stopped in the fourth round, giving British middleweight Lauren Price, 28, another victory in the early stages of her professional career.

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Lauren Parker
IBO intercontinental super-flyweight champion on Radio 5 Live Sports Extra

You don't see it that often where fighters land four or six successive punches.

They aren't going to call it yet but they could, Lauren [Price] is well up there.

Former England footballer Jill Scott is enjoying her retirement after helping the Lionesses win Euro 2022 and she is here tonight supporting a fellow product of the north east, Savannah Marshall.

BBC Radio 5 Live

British super-bantamweight Caroline Dubois: "It was a great performance and I wanted to go out and impress people.

"I wanted to go out and impress people with a knockout. I wanted to beat her up.

"December is next hopefully. I want to box as often as possible, I miss the amateurs where you're boxing five or 10 times a year."

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Super-bantamweight Caroline Dubois has kept the British success going in the O2.

Milena Koleva was saved by the bell after a knock-down at the end of the fourth round but Dubois, 21, finished the job in the fifth to claim her fourth win from four professional fights.

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• Claressa Shields v Savannah Marshall
• Mikaela Mayer v Alycia Baumgardner
• Lauren Price v Timea Belik
• Caroline Dubois v Milena Koleva

Steve Bunce
Boxing expert on BBC Radio 5 Live

We've got two world-title fights here tonight that I believe stand along with Katie Taylor v Amanda Serrano.

This is fantasy boxing.

When Savannah Marshall got her pro licence in 2017 there were just seven other British women with a professional licence. Now there are nearly 50 and on this bill tonight we have 10 women boxing.

That's not in 25 years or 10 years, that's in four-and-a-half years.

The main card has just got under way, with Olympic bronze medallist Karriss Artingstall beating Marina Sakharov.

The British featherweight, 27, claimed a comfortable victory on points for the second win of her professional career.

Her partner Lauren Price, who won middleweight gold in Tokyo, is fighting later.

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American champion Mikaela Mayer insists there is "no denying" women boxing before her super-featherweight unification fight against Alycia Baumgardner.

With women's boxing booming after struggling for decades, Mayer says female fighters are "here to stay".

"For the longest time we didn't have that ability to compete at the highest level, but now that we do there's just no denying us," she said.

"Most of the world didn't ever believe women's boxing would get to this level and have this kind of exposure and hype - but I did.

"I really truly believed that somehow, someway this is what I would be doing with my career and this is the level I would get to."

Mikaela Mayer, who is fighting on the undercard tonight, remembers the first meeting between Shields and Marshall in 2012.

"I remember Savannah boxing and moving and keeping that perfect space away from Claressa," she says. "Not letting her close that space and letting her hands ago. The fight got away from her in those three rounds."

Mayer, 32, and Alycia Baumgardner, 28, will meet in an all-American, super-featherweight unification clash.

Mayer, who holds the WBO, IBF and Ring magazine super-featherweight titles, has previously said she will be walking out to a Spice Girls song, after receiving a personal message from Mel C.