The Australian Open

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Ernests Gulbis of Latvia smashes his racket during his second round match against Sam Querrey of the U.S. at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 15, 2014.(AP Photo/Eugene Hoshiko)

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Sam Querrey of the U.S. celebrates, winning over Ernests Gulbis of Latvia during their second round match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 15, 2014.(AP Photo/Eugene Hoshiko)

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Daniela Hantuchova of Slovakia makes a backhand return to Karolina Pliskova of the Czech Republic during their second round match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 15, 2014. (AP Photo/Aijaz Rahi)

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Former Grand Slam champion Boris Becker of Germany looks down onto Rod Laver Arena as he watches defending champion Novak Djokovic of Serbia in his match against Leonardo Mayer of Argentina at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 15, 2014.(AP Photo/Aaron Favila)

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Novak Djokovic of Serbia lies on the court after falling during his second round match against Leonardo Mayer of Argentina during their second round match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 15, 2014.(AP Photo/Aaron Favila)

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Novak Djokovic of Serbia waits in his seat during break in his second round match against Leonardo Mayer of Argentina at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 15, 2014.(AP Photo/Aaron Favila)

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Serena Williams of the United States waves to the crowd after defeating Vesna Dolonc of Serbia in their second round match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 15, 2014.(AP Photo/Aaron Favila)

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Serena Williams of the United States reacts after losing a point to Vesna Dolonc of Serbia during their second round match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 15, 2014.(AP Photo/Aaron Favila)

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Bernard Tomic of Australia wipes the sweat from his face during his first round match against Rafael Nadal of Spain at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 14, 2014.(AP Photo/Rick Rycroft)

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Australian players Pat Rafter, left, and Lleyton Hewitt play against Eric Butorac of the U.S and Klaasen Raven of South Africa in a first round doubles match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 15, 2014.(AP Photo/Rick Rycroft)