The case of the world No. 1 in men's tennis is at the center of anti-doping protocols and reforms that could redefine its parameters.

For too long it seems WADA has cast out athletes, particularly those with little access to top legal teams like that on Sinner’s side

Jannik Sinner received a 3-month ban after testing positive for a banned substance, with the Italian initially refusing to accept he would face a suspension.

Sinner asked: "Why would we do that if the first independent tribunal found it was no ban at all, why would I accept three months now?"

Jannik Sinner's case was "a million miles away from doping", says World Anti-Doping Agency general counsel Ross Wenzel.