Djokovic, Williams into 4th round in Australia

Novak Djokovic of Serbia makes a forehand return to Denis Istomin of Uzbekistan during their third round match at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 17, 2014.(AP Photo/Andrew Brownbill)

Novak Djokovic of Serbia makes a forehand return to Denis Istomin of Uzbekistan during their third round match at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 17, 2014.(AP Photo/Andrew Brownbill)

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