WADA will present its case robustly again when Sun Yang case returns to CAS (Xinhua) 13:22, December 24, 2020 BEIJING, Dec. 24 (Xinhua) The World Anti-Doping Agency (WADA) said it would present its case robustly again after the Swiss Federal Tribunal (SFT) upheld Sun Yang s appeal and set aside the previous ruling by the Court of Arbitration for Sport (CAS) to ban the Chinese swimmer for eight years. According to the WADA s statement, when the case returns to the CAS panel, it will be chaired by a different chairperson. The CAS found the three-time Olympic champion guilty in February of refusing to cooperate with sample collectors during a visit to his Hangzhou home in September 2018 and handed him an eight-year ban.