Serena Williams advances to defeat Vera Cruz at the Australian Open . Williams faced three set points in the first set against the Russian . Novak Djokovic makes quick work of Russia 's Andrey Martin . Kvitova is one of the contenders at Melbourne Park this year , having triumphed in Sydney last week . Victoria Duval , Stan Wawrinka , Kei Nishikori also advance .
Serena Williams advances to defeat Vera Cruz at the Australian Open . Williams faced three set points in the first set against the Russian . Novak Djokovic makes quick work of Russia 's Andrey Martin . Victoria Duval , Stan Wawrinka , Kei Nishikori also advance .