Tennis is going through 'tricky' times amid the swirling 'rumours' of doping and betting, concedes Novak Djokovic but the World No.1 says he would not question the sport's integrity till the time concrete evidence is presented to prove wrongdoing.
World number ones Novak Djokovic and Serena Williams completed a clean sweep for tennis as they won the Laureus Sportsman and Sportswoman of the Year awards on Monday.
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