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Chinese swimmer Sunâs doping ban reduced to four years, but will miss Tokyo Olympics | More sports News â Times of India 6 seconds ago 1 min read Chinese swimmer Sun Yang has had his eight-year ban for doping violations reduced to four years, the Court of Arbitration for Sport ( CAS ) said in a statement on Tuesday. The decision means that Sun will miss the Tokyo Olympics later this year, but will be eligible for the Paris Games in 2024.