Jannik Sinner is currently defending his title as the world’s best male tennis player at the Australian Open. But come April, he’ll be defending himself in another arena – the Court of Arbitration for Sport. Last year, the tennis world was shocked by revelations both Sinner and women’s world No. 2 Iga Świątek had tested positive for banned substances.

Their cases were resolved in private, raising questions about whether their high profiles and considerable resources gave them an unfair advantage when it came to dodging public scrutiny.