What WADA appealing the ITIA decision means for the world No. 1. Plus, Jon Wertheim answers your questions about tennis fandom and social media discourse.

Novak Djokovic says the ongoing doping case involving world No. 1 Jannik Sinner is “not helping tennis at all."

The world No. 1's doping case continues, even though WADA is not attempting to prove he intentionally took clostebol.

The appeal to the Switzerland-based Court of Arbitration for Sport (CAS) means that the case might not be resolved before Jannik Sinner begins defense of his Australian Open title in January.

Jannik Sinner has revealed he’s had “sleepless nights” amid his ongoing anti-doping controversy. The World No 1 said that he is “very disappointed and also surprised” after the World Anti-Doping Agency (Wada) announced that it would be appealing the decision to clear the Italian of a doping offence.

The men's world No. 1 could face a two-year ban. Here's what to know about the doping proceedings against him so far

Novak Djokovic has given his reaction to the World Anti-Doping Agency’s decision to appeal the “no fault or negligence” verdict reached over Jannik Sinner’s failed drug tests. The International Tennis Integrity Agency (ITIA) announced last month that Sinner would not receive a ban for failing two anti-doping in March after an independent tribunal ruled he was not to blame.

World number one Jannik Sinner said on Monday that he was in "a very difficult moment" and enduring sleepless nights over his doping case.