Daria Kasatkina of Russia reacts to her win against Angelique Kerber of Germany. Photo: EPA

Top-ranked Angelique Kerber stunned by Russian teen Daria Kasatkina in Sydney

World number one loses 7-6 (7-5), 6-2 in second round of Sydney International on Tuesday ahead of Australian Open

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Daria Kasatkina of Russia reacts to her win against Angelique Kerber of Germany. Photo: EPA
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