The World Anti-Doping Agency's appeal against a decision by swimming's governing body FINA to clear Chinese star Sun Yang of a doping offence will be heard at the Court of Arbitration for Sport in public.

This will be just the second time the sport's highest court has opened its doors to the public and it is sure to attract as much attention as the first time, when Ireland's triple Olympic swimming champion Michelle Smith De Bruin failed with her appeal against a four-year ban for tampering with an anti-doping sample in 1999.

The Chinese 27-year-old is accused of smashing the vials containing his blood after a row with a team of FINA drug-testers at his home in September.

The events of that night, which saw Sun, his mother and entourage allegedly interfere with the FINA team's efforts to get samples from the three-time Olympic freestyle champion because they did not believe the testers were properly accredited or qualified, only came to light when the case was leaked to the media in January.

It was suggested at the time that Sun could face a lifetime ban - as he has already served a three-month ban for an earlier offence that many in the sport believe was too lenient, but a subsequent FINA investigation cleared him - prompting a mixture of fury and incredulity around the swimming world.

That was evident at the World Aquatics Championships in South Korea last month, when Sun claimed his 10th and 11th world titles but also clashed with Australia's Mack Horton and Britain's Duncan Scott during medal ceremonies.

But Horton and Scott are not the only people unimpressed with FINA's response to the Sun allegations as WADA announced its intention to challenge his reprieve at CAS in March.

And now, thanks to an update from the Lausanne-based court, we have a tentative date of October for the hearing and the surprising news that it will be conducted in public.

In a statement, CAS said it had been hoped the appeal could be heard in September but, "due to unexpected personal circumstances", one of the parties had to request a postponement - a request that has been accepted by the other parties and CAS.

"A new hearing date will be fixed as soon as possible but is unlikely to be before the end of October 2019," it said.

"At the parties' request, the hearing, which will likely take place in Switzerland, will be open to the public (including the media)."

CAS added that the date and location would be made available as soon as they have been confirmed.