Two heated rivalries will come to a head Saturday, Sept. 10 in a historic championship doubleheader at the O2 Arena in London. (photos by Lawrence Lustig)

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The previously announced main event will see two-time Olympic gold medalist Claressa Shields, the WBC/WBA/IBF/Ring Magazine middleweight champion, aim to once again become undisputed at 160 pounds by facing longtime rival and WBO titleholder Savannah Marshall.

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Shields and Marshall faced off as amateurs, with Marshall edging Shields by decision at the 2012 AIBA Women’s World Championships in Qinhuangdao, China. Shields went 77-1 as an amateur and is the only female boxer to win undisputed titles in two weight classes.

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In the co-feature, Mikaela Mayer will look to get one step closer to becoming the first undisputed champ in her division by putting her WBO/IBF/Ring Magazine junior lightweight titles on the line against WBC champion Alycia Baumgardner.

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