London, UK. 12th Nov, 2016. Dominic Thiem (AUT), Marin Cilic (CRO), Gael Monfils (FRA), Stanislas Wawrinka (SWI) and Bob and mike Bryan (USA) have practice in an empty O2 Arena the day before the ATP Finals start. © Alberto Pezzali/Pacific Press/Alamy Live News

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Keywords: atp, championships, fall, finals, london, november, o2, play, sports, tennis, tour, tournament, world