The Australian Open

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Novak Djokovic of Serbia makes a forehand return to Lukas Lacko of Slovakia during their first round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 13, 2014.(AP Photo/Eugene Hoshiko)

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Ekaterina Makarova of Russia makes a forehand return during her first round match against Venus Williams of the U.S. at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 13, 2014. (AP Photo/Andrew Brownbill)

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Venus Williams of the U.S. reacts during her first round match against Ekaterina Makarova of Russia at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 13, 2014. (AP Photo/Andrew Brownbill)

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Former Grand Slam champion Boris Becker of Germany looks down onto Rod Laver Arena as he prepares to watch defending champion Novak Djokovic in his match against Slovakia's Lukas Lacko at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 13, 2014.(AP Photo/Eugene Hoshiko)

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Defending champion Novak Djokovic of Serbia waves as he walks onto Rod Laver Arena to play Lukas Lacko of Slovakia in their first round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 13, 2014.(AP Photo/Eugene Hoshiko)