Serena Williams retains top spot

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American tennis ace Serena Williams has maintained her number one spot, while German Angelique Kerber has slipped to the third in the latest women`s tennis world rankings issued by the WTA.
Williams remains on top with 8, 625 points and maintains a comfortable advantage of 2,850 over Poland`s Agnieszka Radwanska, who retains her second spot despite not featuring at the Volvo Car Open,Sport24 reported.
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