Christina Hammer (born 16 August 1990) is a Kazakhstani-born 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, becoming the youngest boxer to win a WBO world title; 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. In February 2021, she returned to the amateur ranks with the intention of competing at the Tokyo Olympics. More information...
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