Christina Hammer

Christina Hammer is a German professional boxer. She is a multiple-time world champion in two weight classes, having held the WBO female middleweight title from 2010 to 2019, becoming the youngest boxer in history to win a WBO title. Previously she held the WBC female middleweight title between 2016 and 2018, and the WBO female super-middleweight title in 2013. She also challenged once for the WBO female light-middleweight title in 2014 and once for the undisputed female middleweight championship against Claressa Shields in 2019.