Page last updated at 17:44 GMT, Monday, 28 June 2010 18:44 UK
Serena Williams expects 'tougher' time against Li Na
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Defending champion Serena Williams says she expects a "tougher" match against China's Li Na in the quarter-finals after seeing off a resurgent Maria Sharapova 7-6 (11-9) 6-4 in the fourth round.
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