Claressa Maria Shields is an American professional boxer and former professional mixed martial artist. She has held 18 major world championships spanning five weight classes, including the undisputed female light middleweight title in March 2021; the undisputed female middleweight title twice between 2019 and 2024; the World Boxing Council (WBC) and International Boxing Federation (IBF) female super middleweight titles from 2017 to 2018; the World Boxing Organization (WBO) female light heavyweight title from 2024 to 2025 and the undisputed female heavyweight title since February 2025. Shields currently holds the record for becoming a two, three, four and five division world champion in the fewest professional fights. As of August 12, 2025, she is ranked the world's best active female light heavyweight by BoxRec, as well as the best active female boxer, pound for pound, by ESPN and The Ring.