Italian Jannik Sinner has enjoyed the most successful – and eventful – season of his career, having dominated men’s football as the investigation into his two failed doping tests continues.

The reigning Australian Open and US Open champion, who won his seventh title of the season in Shanghai on Sunday, tested positive for clostebol in March.

An independent panel, to which the International Tennis Integrity Agency (ITIA) presented the case, agreed that there was “no fault or negligence” attached to Sinner, 23.

The world number one provided a “credible” explanation and was able to continue playing.

But the decision that Sinner had no fault was challenged by the World Anti-Doping Agency (WADA), which launched an appeal to the Court of Arbitration for Sport (Cas).

No date has been set for the hearing.

“Whatever happens, I just want this to be resolved as quickly as possible,” said 24-time major champion Novak Djokovic.

“This whole thing doesn’t help our sport at all.”

BBC Sport analyzes the key issues at the heart of a complex subject.