Jannik Sinner's Australian coach Darren Cahill has jumped to the defence of his grand slam-winning charge as the Italian star found himself embroiled in a drugs controversy.
Sinner's avoidance of a ban by tennis chiefs after providing two positive drugs tests for a banned steroid continued to spark accusations of double standards operating in the sport.
But Cahill, who also revealed the episode had made Sinner so ill that he missed the Olympics with tonsillitis, insisted the 23-year-old, whose positive tests came after massages given by his physio, had done no wrong.
