'So shady': Nick Kyrgios fumes over key detail as Jannik Sinner's court date revealed

Nick Kyrgios has labelled the Court of Arbitration for Sport's decision to hold WADA's appeal to ban Jannik Sinner from the sport behind closed doors as "so shady".

The Court of Arbitration for Sport has scheduled a closed-doors hearing on April 16-17 at its headquarters in Lausanne, Switzerland, as the World Anti-Doping Agency seeks to overturn the decision not to ban the Italian world No.1.

CAS gave no timetable for a verdict, though the parties could request a fast-tracked decision before Roland-Garros starts on May 25.

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WADA is challenging a decision last year by the International Tennis Integrity Agency not to suspend Sinner for what it judged was accidental contamination by a banned anabolic steroid last March. Sinner's explanation — that trace amounts of Clostebol in his doping sample was due to a massage from a trainer who used the substance after cutting his own finger — was accepted.

Sinner won the US Open in September after details of his case were revealed. It had been kept confidential since April because Sinner successfully appealed against being provisionally banned from playing.

The 23-year-old Italian has faced scepticism from other players, including Novak Djokovic, who have suggested he got preferential treatment from tennis authorities.

As confident as he repeatedly has said he is about the eventual outcome, the 23-year-old Italian acknowledged that it's on his mind as the year's first grand glam tournament is set to begin on Sunday.

“Yeah, you think about this, of course,” Sinner said. “I would lie if I would tell you I forget.”

He and Iga Swiatek, a five-time major champion, both were able to go for months last season without anyone knowing what was happening behind the scenes and that they'd failed tests.

Sinner tested positive twice for trace amounts of an anabolic steroid at a tournament in March; those results — and the fact that he was cleared by the International Tennis Integrity Agency (ITIA) — did not come out until August, shortly before the start of the US Open, which he would go on to win. He was cleared because the ITIA accepted his explanation: a trainer exposed Sinner to a banned substance by giving him a massage shortly after using a cream on his own injured finger.

Swiatek failed an out-of-competition drug test in August, but her one-month suspension wasn't known until late November, after she sat out three events without revealing why. By the time her case was announced by the ITIA — which accepted that her sample was tainted because of a contaminated sleep aid — all that was left for her to serve was a week, which landed in the off-season.

On Friday, Swiatek described the initial period she was sidelined, which she talked up at the time to personal reasons, as “pretty chaotic” and said, “For sure, it wasn’t easy; it was probably, like, the worst time in my life".

“It got pretty awkward. Like we chose for the first tournament to say 'personal reasons’ because we honestly thought the suspension is going to be lifted soon. From the beginning it was obvious that something was contaminated because the level of this substance in my urine was so low that it had to be contamination,” Swiatek said.

“We started, yeah with ‘personal issues',” she added, “because I needed also time to figure everything out.”

Swiatek said she was worried about what other players' reactions would be at the start of this season.

“Besides the fact I couldn’t play, this was the worst thing for me: what people would say. Because I always worked hard to be a good example, to show my integrity, show good behaviour,” she said. “Having no control over this case really freaked me out a bit. But in the locker room, I mean, the girls are great.”