World No1 Novak Djokovic serving during his match against Lukas Rosol of the Czech Republic at the China Open tennis tournament in Beijing Petar Kujundzic

World No1 Novak Djokovic serving during his match against Lukas Rosol of the Czech Republic at the China Open tennis tournament in Beijing Petar Kujundzic

Result: Kyle Edmund sees off Dusan Lajovic in Shanghai Masters qualifier #ShanghaiMasters #Tennis

Result: Kyle Edmund sees off Dusan Lajovic in Shanghai Masters qualifier #ShanghaiMasters #Tennis

Agnieszka Radwanska of Poland hits a return against Johanna Konta of Britain during the women's singles final of the China Open tennis tournament in Beijing on October 9, 2016. / AFP / Nicolas ASFOURI

Agnieszka Radwanska of Poland hits a return against Johanna Konta of Britain during the women's singles final of the China Open tennis tournament in Beijing on October 9, 2016. / AFP / Nicolas ASFOURI

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

Na Li acknowledges the spectators after she defeated Daniela Hantuchova in their opening round of the China Open tennis tournament at the National Tennis Stadium in Beijing, China Sunday, Sept. 29, 2013.

Na Li acknowledges the spectators after she defeated Daniela Hantuchova in their opening round of the China Open tennis tournament at the National Tennis Stadium in Beijing, China Sunday, Sept. 29, 2013.

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)

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...

Serena Williams of the U.S. reacts after winning a point against Lucie Safarova of the Czech Republic during their women's singles match at the China Open tennis tournament in Beijing October 2, 2014. (REUTERS/Petar Kujundzic)

Photos of the day - October 2, 2014

Serena Williams of the U.S. reacts after winning a point against Lucie Safarova of the Czech Republic during their women's singles match at the China Open tennis tournament in Beijing October 2, 2014. (REUTERS/Petar Kujundzic)

Chinese tennis player Li Na, right, and Petra Kvitova of the Czech Republic embrace each other during a special retirement ceremony for her during the China Open tennis tournament at the National Tennis Stadium in Beijing, China, Tuesday, Sept. 30, 2014. (AP)

Chinese tennis player Li Na, right, and Petra Kvitova of the Czech Republic embrace each other during a special retirement ceremony for her during the China Open tennis tournament at the National Tennis Stadium in Beijing, China, Tuesday, Sept. 30, 2014. (AP)

Article & Video: Djokovic wins China Open  #tennis

Azarenka, Djokovic take titles at China Open

Article & Video: Djokovic wins China Open #tennis

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)

Photos of the day - October 4, 2014

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)

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)

Photos of the day - October 2, 2014

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)

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)

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)

Photos of the day - October 5, 2014

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)

Maria Sharapova of Russia reacts as she prepares to return the ball during her women's singles tennis match against Carla Suarez Navarro of Spain at the China Open tennis tournament in Beijing, October 1, 2014. (REUTERS/Jason Lee)

Photos of the day - October 1, 2014

Maria Sharapova of Russia reacts as she prepares to return the ball during her women's singles tennis match against Carla Suarez Navarro of Spain at the China Open tennis tournament in Beijing, October 1, 2014. (REUTERS/Jason Lee)

Andy Roddick, of the United States, carries his broken racquet off the court after smashing it against the ground during his quarterfinal match against Spain's Juan Carlos Ferrero, at the China Open tennis tournament in Beijing Friday Sept. 26, 2008. [Agencies]

Andy Roddick, of the United States, carries his broken racquet off the court after smashing it against the ground during his quarterfinal match against Spain's Juan Carlos Ferrero, at the China Open tennis tournament in Beijing Friday Sept. 26, 2008. [Agencies]

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