(Reuters) - Banned Chinese swimmer Sun Yang has lodged an appeal at the Swiss federal court in a bid to overturn his eight-year suspension for doping, the Swimming World website reported on Tuesday.
Sun was banned by the Switzerland-based Court of Arbitration for Sport (CAS) in March after the World Anti-Doping Agency (WADA) appealed against a decision to clear him of wrongdoing during a 2018 doping test.
Swimming World here said the three-times Olympic champion's appeal had been registered by the Swiss federal court on April 29.
Reuters was unable to confirm with the court.
Sun, who was given a three-month ban for doping in 2014, said in March that he had retained a lawyer to appeal to the Swiss federal court.
The 28-year-old is the reigning world and Olympic champion in 200 metres freestyle and won two gold medals at the 2012 London Games and another at Rio de Janeiro in 2016.
Reporting by Ian Ransom; editing by Richard Pullin