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Christina Hammer (born 16 August 1990) is a German boxer. As a professional, she has held multiple world championships in two weight classes, including the WBO female middleweight title from 2010 to 2019, [5] [6] becoming the youngest boxer to win a WBO world title; [7] the WBC female middleweight title between 2016 and 2018; [8] and the WBO female super-middleweight title in 2013. [9]