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Kerber advances in Dubai Tennis Championship

Top seed Angelique Kerber remains on course to usurp Serena Williams as the world No 1 after booking her place in the third round of the Dubai Duty Free Tennis Championships.

As three of her top rivals were beaten Karolina Pliskova, Dominika Cibulkova and Garbine Muguruza – world ranked 3, 5 and 7, Kerber easily beat German rival Mona Barthel 6-4, 6-3 to move into the last 16.

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Kerber will face Olympic champion Monica Puig later on Wednesday while fourth seed Agnieska Radwanska takes on Catherine Bellis.