Kyrgios, who was a finalist at Wimbledon in 2022, has been an outspoken critic of Sinner since he failed a drug test and escaped a ban following an investigation by the International Tennis Integrity Agency (ITIA).

Sinner, who has won over $20m in prize money since twice testing positive for an anabolic steroid in March but on August 20, was cleared to continue playing after an independent tribunal determined he was not to blame and imposed no punishment.

The tribunal accepted Sinner’s explanation that the banned substance entered his body as a result of a massage from his physio, who had used a spray containing the steroid to treat a cut on their finger.

WADA has appealed to the Court of Arbitration for Sport, seeking to impose a ban of up to two years on the 23-year-old Italian and they are pushing for him to be banned for ‘one to two years’ in a case that is expected to be heard in the first half of 2025.

Now Kyrgios has launched a fresh attack on Sinner and doping control chiefs in tennis, with the Aussie’s comments predictably outspoken.

“I just think that it’s been handled horrifically in our sport,” Kyrgios told reporters in Brisbane, where he is making his injury return.

“Two world number ones both getting done for doping is disgusting for our sport. It’s a horrible look

“The tennis integrity right now, and everyone knows it, but no one wants to speak about it, is awful. It’s not okay.

“I know that people don’t like when I just speak out about things, be honest about things. For a kid that grew up playing tennis, I enjoyed the competition, I enjoyed playing.

“I can get emotional, I can throw a racket, but that’s nothing compared to cheating and taking performance-enhancing drugs. That’s ridiculous in my opinion.”

Kyrgios went on to question how two of Sinner’s doping tests returned positive results, even though they were conducted at different times.

“He did fail two doping tests at separate times, as well. It wasn’t one after the other. They were a different time frame,” the Australian added.

“So if you think that that’s the way that it got in his system. If that’s how you think it’s happened, then…

“But if he didn’t do anything wrong, why did they take his prize money and points (at Indian Wells) away? Obviously, they found something wrong with it. Obviously, WADA has appealed it because of this.”

ITIA CEO Karen Moorhouse spoke to Tennis365.com about the Sinner and Swiatek cases and compared the outcome to that of Simona Halep, who was eventually handed a nine-month suspension after her failed test was also found to be due to a contaminated substance.

“It’s the same rules and the same processes for every player,” said Moorhouse.

“All cases are different and each case turns on individual facts. Cases can also be quite complex, so it isn’t right to look at two headlines and draw comparisons between two cases as the detail is always the key part.

“Let’s take Swiatek and Halep. The CAS tribunal found that her (Halep’s) supplement was contaminated. So just in relation to that finding, they said nine months (suspension).

“That was the tribunal deciding on the objective fault she had and the subjective fault she should have. So what should she have done in relation to the product that was found to be contaminated?

“In relation to Swiatek, the contaminated product was a medication. So it was not unreasonable for a player to assume that a regulated medication would contain what it says on the ingredients.

“Therefore, the level of fault she could accept was at the lowest level as there was very little more she could have done reasonably to mitigate the risk of that product being contaminated.

“Halep’s contamination was not a medication. It was a collagen supplement and her level of fault was found to be higher.

“The key point here is it’s rare to find two cases that are the same they will all turn on their particular facts.”

Kyrgios is preparing to make his return to tennis at the ATP 250 event in Brisbane, where he will play in the singles tournament and also team up with 24-time Grand Slam champion Novak Djokovic in doubles.