All eyes are on Nick Kyrgios on the eve of the Australian Open amid fears a niggling injury could delay his return to grand slam tennis.

Nick Kyrgios wants transparency, Novak Djokovic thinks there's a doping double standard in tennis and Jannik Sinner is saying very little as his stoush with WADA at the CAS looms large.

A former Australian Open champion and top ten men's tennis player says Nick Kyrgios is "very good" for the sport and is hoping to see the polarising star return to his best again.