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.

World Anti-Doping Agency is appealing the "no fault or negligence" finding in Jannik Sinner's anti-doping investigation for clostebol.

The Italian champion is almost certain to end the year as world number 1, but his main goals before the end of the season are the Nitto ATP Finals in Turin and the Davis Cup Finals in Malaga. Last year, Jannik had dragged Italy to a historic Davis Cup triumph after losing the ATP Finals final to Novak Djokovic.

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.

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

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

Martina Navratilova, 18-time Grand Slam champion, criticized WADA for appealing Jannik Sinner’s doping case verdict. Martina Navratilova, former world No 1 and 18-time Grand Slam champion, has strongly criticized the World Anti Doping Agency (WADA) after their decision to appeal Jannik Sinner’s innocence verdict over doping case.

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

World No. 1 Daniil Medvedev has shared his thoughts on the Jannik Sinner doping controversy, which has been brought back into the spotlight after WADA appealed his clearance.