Martin Kližan

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Stephane Robert of France, right, shakes hands with Martin Klizan of Slovakia at the net after his win in their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2014.(AP Photo/Aijaz Rahi)

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Stephane Robert of France makes backhand return to Martin Klizan of Slovakia during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2014.(AP Photo/Aijaz Rahi)

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Stephane Robert of France celebrates his win over Martin Klizan of Slovakia during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2014.(AP Photo/Aijaz Rahi)

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Stephane Robert of France celebrates his win over Martin Klizan of Slovakia during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2014.(AP Photo/Aijaz Rahi)

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Spain's Rafael Nadal returns against Slovakia's Martin Klizan in their second round match at the French Open tennis tournament, at Roland Garros stadium in Paris, Friday, May 31, 2013. (AP Photo/Michel Spingler)