Marlen Esparza (born July 29, 1989) is an American professional boxer who held the WBC female flyweight title since June 2021 and the WBA and The Ring female flyweight title since April 2022, and the WBO one since July, 2023. As an amateur, she became the first American woman to qualify for the Olympics in the first year that women's boxing was an Olympic event, going on to win a bronze medal in the women's flyweight division at the 2012 Olympics in London.

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