Serena Williams sounded a warning for her fellow Australian Open contenders on Wednesday with a sleek 6-1 6-4 victory over Bulgarian Tsvetana Pironkova to reach the quarterfinals of the Yarra Valley Classic in Melbourne.

After top two seeds Ash Barty and Sofia Kenin faced steep challenges to keep their preparations on course, Williams put up a contrasting show at Melbourne Park’s Margaret Court Arena in the evening session...

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