London, UK. 11th Nov, 2016. Novak Djokovic (SRB) have practice during the media day of the ATP World Tour Finals at The O2. Credit: Alberto Pezzali/Pacific Press/Alamy Live News

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Keywords: arena, atp, cup, djokovic, finals, london, men, nole, novak, o2, practice, serbia, single, sport, switzerland, tennis, tournament, training