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World number one Novak Djokovic continued his fine form with a win.
The 16-time Grand Slam champion, who won the Japan Open without dropping a set of serbia, cruised to a victory that was 6-3.
32, defending champion Djokovic and American John Isner, will play with .
Isner, 34, struck 19 aces and lost just six points in a 7-5 6-3 triumph over the Lucas Pouille of France on his first serve.
seed Stefanos Tsitsipas, 21, edged out Canadian 19-year-old Felix-Auger Aliassime of the most exciting talents on the tour of the men.
Tsitsipas, who had never beaten his 19-year-old opponent, even on the junior circuit, had to be patient before procuring a 7-6 (7-3) 7-6 (7-3) win.
Victory moved Tsitsipas closer to qualifying for the ATP Finals in London next month, while German fifth seed Alexander Zverev – yet another still hoping to qualify and have the opportunity to defend his name – also wanted two tie-breaks to overcome French veteran Jeremy Chardy in a 7-6 (15-13) 7-6 (7-3) win.
Belgian 13th seed David Goffin , Spanish eighth seed Roberto Bautista Agut, seed Matteo Berrettini that was Italian and seventh seed Karen Khachanov developed to increase their odds of attaining the season-ending finals.
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