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Shields pours on the punches early en route to victory (0:43)

In the first round, Shields unleashed a flurry of punches. It was 0: 43.

1:42 AM AST

After coming out of the toughest bout of her career as the undisputed champion of the world, Claressa Shields jumped up and down in the ring.

This is the second time.

Shields became the undisputed champion for the second time after defeating Marshall by a unanimous decision in London on Saturday.

By beating Marshall, Shields made up for the only loss of her career in boxing -- Marshall defeated her as an amateur a decade ago, and in doing so established herself as arguably the best woman boxer ever.

Shields said in the ring that it was a special moment for women's boxing. "Savannah Marshall and Alycia Baumgardner." Women's boxing has been around for a long time.

I think that's the fight of the year because we are in front of 20,000 fans in London. It's an unbelievable moment and I'm just so happy.

Shields dominated the first part of the fight, coming out with an aggressive strategy and technical defense to keep Marshall at bay. Shields leaned on the ropes at times to try to tire Marshall out.

It seemed like Shields was able to find a middle ground that would allow him to counteract some of Marshall's power.

In the first half of the fight, Shields landed more power punches than Marshall. In the fifth round, Marshall began to land more punches.

According to Compubox, Shields had more power punches landed against her in the first two rounds than Marshall had against her.

Marshall landed more power punches than Shields, but Shields landed more power punches overall.

She's a hard worker. She's a tough person. She has the ability to keep going. Ten years later, I'm the better fighter.

Shields said she couldn't see out of her right eye in the last five rounds because of Marshall's power.

Shields thought she was hit by a hard shot from Marshall in each round, but she countered and won the fight by working harder inside.

Marshall said in the ring thatClaressa is a brilliant fighter. "Yes, she is." She's not as fast as I thought she was, but she's a brilliant fighter and she's earned the title of greatest woman of all time.

She said she would like to fight again in the United Kingdom, but she also said she hoped she wouldn't be booed again. Shields wore shorts and gloves with a pattern of the American flag on them and danced to the song "Tear It Up" at the top of the platform as she walked to the ring.

Shields won a unanimous decision even though he said there was a second chance in the contract. She was open to fighting Marshall again in the US if fans wanted it.

The junior lightweight unification fight was the co-feature of the all- women's card.

Baumgardner won a split decision to win all three belts after months of trash talking. Both fighters took complete control of the fight, which could have gone either way.

Baumgardner took control of the fight in the early rounds. Almost every round in the back half was very close.

Baumgardner cut Mayer in the seventh round after three straight rounds of him being the aggressor.

While throwing more jabs than Baumgardner, he landed a higher percentage of jabs. Baumgardner jabbed 61 times.

Baumgardner thought he landed the cleaner shots in the fight. The harder shots, that's what they are.

She became the leader of the world. She said after the fight that she was not interested in a second fight with the man she lost to in the first.