The handling of Swiatek's ban and the case of world number one Jannik Sinner - who received no ban and was cleared of wrongdoing after testing positive for a banned substance - have drawn criticism.

Nick Kyrgios described the two high-profile cases as "disgusting" for tennis.

Italy's Sinner says he still does not know when the hearing to settle his ongoing doping controversy will take place.

The Italian, who is the defending men's singles champion at the Australian Open, tested positive for the anabolic steroid clostebol, which was accepted as being caused by contamination.

However, the World Anti-Doping Agency has appealed against the decision to clear him of blame.

"I know exactly as much as you guys know," Sinner told media in Melbourne.

"It's something I have with me already for quite a long time. But it is what it is.

"I'm here trying to prepare for the Grand Slam. Let's see how it goes."

Sinner had the most successful season of his career to date in 2024, winning two major titles, the season-ending ATP Finals, and leading Italy to back-to-back Davis Cup triumphs.

Sinner added: "In my mind I know exactly what happened. That's how I block it.

"I haven't done anything wrong. That's why I'm still here. That's why I'm still playing. I don't want to respond to what Nick [Kyrgios] said or what other players say."

Sinner begins his campaign against Chile's Nicolas Jarry at Melbourne Park.

Britain's Emma Raducanu said she avoided using antiseptic spray on a recent bite that caused her ankle to swell, such is the care she feels she must take to avoid positive tests for prohibited substances.

"I would say all of us are probably quite sensitive to what we take on board, what we use," Raducanu said.

"It's obviously a concern on our minds. We're all in the same boat. I think it's just how we manage the controllables as best as we can.

"If something out of our control happens then it's going to be a bit of a struggle to try and prove."