Serena Williams of the U.S. hits a return to Vera Zvonareva of Russia during their women's singles second round match at the Australian Open 2015 tennis tournament in Melbourne January 22, 2015. REUTERS/Issei Kato
MELBOURNE (Reuters) - Venus Williams's encouraging form at the Australian Open has given younger sister Serena cause to look over her shoulder after the siblings eased into the third round with straight-sets wins at Melbourne Park on Thursday.
For top seed and 18-times grand slam champion Serena, her win over former world number two Vera Zvonareva, on the comeback trail after a 2014 season blighted by injury, was expected.
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