Maria Sharapova (Reuters/David Gray)Russian tennis star Maria Sharapova topped Sara Errani of Italy in her opening match at the WTA Championships in Istanbul, Turkey. The opener was tight, but Sharapova still had what it took to come up with an extra break when it mattered most. It was a lot easier in the second set, which Errani gave up without a serious fight, allowing the Russian to collect a 6-3 6-2 win. The result sees Maria sharing the top spot in the White Group with Agnieszka Radwanska at the season-ending event.The Pole also needed the minimum of two sets to deal with Czech Petra Kvitova, 6-3 6-2.There was also one match in the Red Group, with favorite Serena Williams proving her class against Germany’s Angelique Kerber, 6-4 6-1. World No.1 Victoria Azarenka of Belarus and Chinese Na Li are to meet on Wednesday.According to the WTA Championships’ formula, two of the best players from each group will progress to the quarterfinals.
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