• Worries for defending champion before Australian Open
• Sharapova, Halep and Muguruza also nursing injuriesSerena Williams has withdrawn from the Hopman Cup in Perth because of a knee injury and will not play in the USA’s final match on Thursday.
The world No1 missed the first match of the round-robin tournament and then retired during the moment set of her match against Australia’s Jarmila Wolfe on Tuesday.
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Source: theguardian.com