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

Tennis faces a new crisis of perception despite following its own rules on integrity. The two-tiered resentment is not going to fade away.

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

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.