Claressa Shields and Savannah Marshall were the first female boxers to headline the O2 Arena in 2021.
In 2021, Claressa Shields and Savannah Marshall became the first female boxers to headline the O2 Arena in London. Shields and Marshall fought for the undisputed world middleweight championship in a historic fight that was broadcast on Showtime in the United States. The fight ended in a unanimous decision victory for Shields, who became the first undisputed middleweight champion in women's boxing history.