Christina Hammer is a German boxer of Kazakh origin. She has won multiple world championships in two weight classes as a professional.

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Following her victory over Zita Zatyko, Hammer was named WBF and WBO Fighter of the Year, as well as BDB Female Boxer of the Year.

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Hammer represented Eschwege Boxing Club in a number of German tournaments, where she defeated the 2007 German junior champion by unanimous decision.

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Hammer considered competing in the 2012 London Olympics after winning a silver medal at the German National Championships, but her desire to become a super champion was stronger.

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On October 23, 2010, Hammer upped her game and faced Teresa Perozzi for the vacant WBO middleweight title at Erdgas Arena in Riesa, Germany.

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During the round break, Kiss indicated to her trainer that she was no longer willing to continue, resulting in Hammer's TKO victory.

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On April 13, 2019, Hammer was defeated by unanimous decision in her bid to become the undisputed women's middleweight champion. Shields won the fight 98-92 on all three judges' scores.

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The fight was decided in the second round by technical knockout after 35 seconds, with Hammer stopping Sikmashvili.

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On January 27, 2019, it was announced that Hammer would fight Elene Sikmashvili on February 9 at the Verti Music Hall in Friedrichshain, as Hammer wished to box in Germany.