Two of athletics' biggest stars have been sensationally sidelined just days before the 2025 World Athletics Championships in Tokyo. American sprint prodigy Erriyon Knighton has been slapped with a four-year doping ban, while Ethiopian middle-distance ace Diribe Welteji has been provisionally suspended for missing a test. The twin blows have reignited fierce debate over doping control and the credibility of 'clean' competition.
