USA sprinter Knighton handed four-year doping ban

United States sprinter Erriyon Knighton has been handed a four-year ban after the Court of Arbitration for Sport partially upheld appeals from World Athletics and the World Anti-Doping Agency against a decision not to suspend him.

Knighton, 21, tested positive for trenbolone – a banned substance used for muscle growth – in March but avoided a ban following an independent arbitrator’s ruling and was cleared to compete at the 2024 Olympics.

The ban comes into immediate effect and therefore prevents Knighton, who finished fourth in the 200m in Paris last summer, from competing in the upcoming World Championships in Tokyo.

Knighton submitted evidence claiming the adverse findings were due to meat contamination.

World Athletics and Wada found the evidence “fell short of the required proof of source” and was “statistically impossible”, and Cas has now ruled in their favour.

Meanwhile, Ethiopian middle distance runner Diribe Welteji will also miss the World Championships, which run between 13-21 September, after Cas upheld a provisional suspension while her doping case is heard.