On the eve of his return to the court, Novak Djokovic has weighed in on the tennis’ high profile doping cases and criticized what he perceives as double standards in the sport.

Novak Djokovic told reporters in Australia that he "is not questioning whether Jannik Sinner took the banned substance intentionally or not" but noted that he is "really frustrated" with the fact that no one knew anything about the Italian and Iga Swiatek until the investigation in their doping cases concluded.

BRISBANE – Novak Djokovic on Dec 29 called for more transparency around doping suspensions in tennis, saying high-ranked players appeared to be treated differently to others. The 24-time Grand Slam champion agreed with Australian Nick Kyrgios ...