Sun Yang, double world champion in South Korean Gwangju in August, is accused of sabotaging a doping test in September last year. The Chinese swimming star was released in January by the International Swimming Association Fina, which was appealed to Cas by the International Anti-Doping Agency Wada.
On Friday, he will be heard by the Sports Arbitration Court, Cas, in Montreux, Switzerland. A hearing that is open to the public, which is only the second time in history.
CAS announced today that Wada wants to see 27-year-old Sun Yang suspended for up to eight years for the sabotage, reports the AP. Sun earned a three-month suspension in 2014, after being tested positive.
If Wada wins, the triple Olympic champion misses the Tokyo 2020 championship.
Friday's trial is expected to last all day, but a verdict in the case is not expected to come until the beginning of next year.
Almost the entire swimming world has criticized him, one of them being Sarah Sjöström.
The browser is not supported
SVT does not support playback in your browser. We therefore recommend that you switch to another browser.
Learn more about browser support
You need JavaScript enabled in your browser to view this video.
Rapsys, on the right, was washed. Then Sun Yang won the gold. Photo: TTThe browser is not supported
SVT does not support playback in your browser. We therefore recommend that you switch to another browser.
Learn more about browser support
You need JavaScript enabled in your browser to view this video.
Here marks the silver medalist on the podium against doping accused Chinese Photo: Photo AgencyThe browser is not supported
SVT does not support playback in your browser. We therefore recommend that you switch to another browser.
Learn more about browser support
You need JavaScript enabled in your browser to view this video.
Gold to Sun Yang after Danas Rapsy's wash