(Reuters) – American sprinter Erriyon Knighton was handed a four-year ban for an Anti-Doping Rule Violation after the Court of Arbitration for Sport partially upheld appeals by World Athletics and the World Anti-Doping Agency on Friday.

His ban is effective from Friday with credit for the provisional suspension he served between April 12 and June 19 last year, preventing the 21-year-old from competing at the upcoming World Championships in Tokyo.

Knighton, a 200 metres world silver medallist in 2023, was charged with an ADRV in May 2024 when an out-of-competition doping test revealed the presence of Epitrenbolone, an anabolic steroid on WADA’s prohibited list.

The U.S. Anti-Doping Agency (USADA) attempted to sanction Knighton but an Arbitration Tribunal said he should not be banned as h

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