Serbia's Novak Djokovic, center, performs South Korean rapper PSY's " Gangnam Style" dance with volunteers on a court after a prize presentation for the men's singles final match of the China Open tennis tournament in Beijing Sunday, Oct. 7, 2012. Djokovic won the China Open tennis tournament, defeated Jo-Wilfried Tsonga 7-6, 6-2. (AP Photo/Andy Wong)

Serbia's Novak Djokovic, center, performs South Korean rapper PSY's " Gangnam Style" dance with volunteers on a court after a prize presentation for the men's singles final match of the China Open tennis tournament in Beijing Sunday, Oct. 7, 2012. Djokovic won the China Open tennis tournament, defeated Jo-Wilfried Tsonga 7-6, 6-2. (AP Photo/Andy Wong)

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Serena Williams of U.S. holds her winning trophy and waves to her fans after the final of the China Open tennis tournament at the National Tennis Stadium in Beijing, China, Sunday, Oct. 6, 2013. Williams defeated Jelena Jankovic of Serbia 6-2, 6-2. (AP Photo)

Serena Williams of U.S. holds her winning trophy and waves to her fans after the final of the China Open tennis tournament at the National Tennis Stadium in Beijing, China, Sunday, Oct. 6, 2013. Williams defeated Jelena Jankovic of Serbia 6-2, 6-2. (AP Photo)

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Maria Sharapova of Russia shouts after getting a points during her match against Svetlana Kuznetsova of Russia at the China Open tennis tournament at the National Tennis Stadium in Beijing, China, Friday, Oct. 3, 2014. (AP Photo/Vincent Thian)

Maria Sharapova of Russia shouts after getting a points during her match against Svetlana Kuznetsova of Russia at the China Open tennis tournament at the National Tennis Stadium in Beijing, China, Friday, Oct. 3, 2014. (AP Photo/Vincent Thian)

Andrea Petkovic of Germany serves during her women's singles match against Simona Halep of Romania at the China Open tennis tournament in Beijing October 2, 2014. (REUTERS/Petar Kujundzic)

Andrea Petkovic of Germany serves during her women's singles match against Simona Halep of Romania at the China Open tennis tournament in Beijing October 2, 2014. (REUTERS/Petar Kujundzic)

Eugenie Bouchard of Canada receives medical attention during her first round match against Andrea Petkovic of Germany in the China Open tennis tournament at the National Tennis Stadium in Beijing, Monday.

Eugenie Bouchard of Canada receives medical attention during her first round match against Andrea Petkovic of Germany in the China Open tennis tournament at the National Tennis Stadium in Beijing, Monday.

Novak Djokovic of Serbia celebrates after winning against Andy Murray of Britain during their men's singles semi-final match at the China Open tennis tournament in Beijing October 4, 2014. (REUTERS/Petar Kujundzic)

Novak Djokovic of Serbia celebrates after winning against Andy Murray of Britain during their men's singles semi-final match at the China Open tennis tournament in Beijing October 4, 2014. (REUTERS/Petar Kujundzic)

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Novak Djokovic of Serbia celebrates after winning against Tomas Berdych of the Czech Republic during the men's singles final match at the China Open tennis tournament in Beijing October 5, 2014. (REUTERS/Petar Kujundzic)

Novak Djokovic of Serbia celebrates after winning against Tomas Berdych of the Czech Republic during the men's singles final match at the China Open tennis tournament in Beijing October 5, 2014. (REUTERS/Petar Kujundzic)

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Ana Ivanovic of Serbia serves to Maria Sharapova of Russia during their women's singles semi-final match at the China Open tennis tournament in Beijing October 4, 2014. REUTERS-Petar Kujundzic

Ana Ivanovic of Serbia serves to Maria Sharapova of Russia during their women's singles semi-final match at the China Open tennis tournament in Beijing October 4, 2014. REUTERS-Petar Kujundzic

Winner Garbine Muguruza of Spain (R) poses with runner-up Timea Bacsinszky of Switzerland (L) during the awards ceremony for the women's singles final match at the China Open tennis tournament in B...

Winner Garbine Muguruza of Spain (R) poses with runner-up Timea Bacsinszky of Switzerland (L) during the awards ceremony for the women's singles final match at the China Open tennis tournament in B...

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