On the eve of his return to the court at the Brisbane International, Novak Djokovic has weighed in on tennis’ high-profile doping cases and criticised what he perceives as double standards in the sport. The former World No. 1, who is chasing a record 25th Grand Slam title at next month’s Australian Open, expressed his frustration Sunday at being “kept in the dark” regarding top-ranked Jannik Sinner’s doping case.

Jannik Sinner and Iga Swiatek