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 Garbine Muguruza of Spain in action against Aryna Sabalenka of Belarus.
  (Reuters)
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 Sabalenka, who claimed her second title of the season at the
  Wuhan Open last week, edged a tight opening set and the Belarusian took
  control in the next to overpower Spaniard Muguruza and secure victory in an
  hour and 46 minutes.
 Former French Open champion Ostapenko struggled with a wrist
  injury before losing to local hope Wang in 55 minutes.
 Guangzhou champion Wang, who has won 14 of her last 17 matches,
  next plays former world number one Karolina Pliskova or Aliaksandra
  Sasnovich.
 World number three Angelique Kerber fought back from 5-3 down in
  the first set to beat Carla Suarez Navarro 7-6(4) 6-1.
 US Open champion Naomi Osaka crushed Danielle Collins 6-1 6-0 to
  set up a clash with 10th seed Julia Goerges who beat the Japanese the last
  time they met in Charleston this season.
 American Sloane Stephens took advantage of an error-prone
  display by China's Zheng Saisai to win 6-1 6-3 and set up a clash with
  Dominika Cibulkova who beat Daria Gavrilova 6-3 6-3.
 On the men’s side, US Open finalist Juan Martin del Potro
  swatted aside Spain's Albert Ramos-Vinolas 7-5 6-2 on Tuesday to reach the
  China Open second round.
 
 Juan Martin del Potro of Argentina in action against Albert
  Ramos Vinolas of Spain. (Reuters)
 Del Potro, playing his first match since losing to Novak
  Djokovic in the US Open final last month, looked in fine form as he fired 10
  aces and won 86 percent of points on his first serve to seal victory in 90
  minutes.
 The 30-year-old Argentine can qualify for next month's ATP
  Finals in London for the first time since 2013 if he reaches the final in
  Beijing. He plays Russia's Karen Khachanov next.
 Rafael Nadal, Djokovic and Roger Federer have secured their
  places in the season-ending tournament.
 Bulgaria's Grigor Dimitrov, a finalist in Beijing two years ago,
  began his campaign with a solid 7-5 6-3 victory over American Tennys
  Sandgren.
 Spain's Fernando Verdasco was made to work hard before beating
  France's Gael Monfils 2-6 7-6(3) 7-6(5) in two hours and 23 minutes.
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                    Source: NDO