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In 2019, Claressa Shields defeated Christina Hammer in a unification bout to become the undisputed female middleweight champion. The fight was held at the Mohegan Sun Arena in Uncasville, Connecticut, and was broadcast on Showtime. Shields won by unanimous decision, with all three judges scoring the fight 99-91. This was the first time that a woman had held all four major world titles in the middleweight division.