Novak Djokovic has weighed in on tennis's high-profile doping cases and criticized what he perceives as double standards in the sport.

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Novak Djokovic says Nick Kyrgios has 'spoken well' about Jannik Sinner 's doping case after the Aussie labelled the scandal 'disgusting' for tennis.

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.

Nick Kyrgios has said the doping charges against Jannik Sinner and Iga Swiatek are “disgusting for our sport” as he prepares to make his long-awaited return to tennis.

Nick Kyrgios slammed the Jannik Sinner and Iga Swiatek doping cases as "disgusting" and "horrible" ahead of his ATP comeback. Anyone who has been regularly following tennis for the past couple of months, knows extremely well that the 2022 Wimbledon finalist has been very sharp in his criticism of the two high-profile doping cases.

Novak Djokovic has added his voice to the frustrations in tennis over the handling of Jannik Sinner and Iga Swiatek's doping cases.