Double Olympic 800m champion Caster Semenya was discriminated against by rules requiring her to lower her testosterone levels.
The European Court of Human Rights found this in a ruling on Tuesday.
The 32-year-old South African appealed to the court over the way Switzerland handled her legal fight against World Athletics’ rules that she must take medication to reduce her testosterone levels as mandated by track and field’s governing body.
Semenya who is classed as having differences in sexual development (DSD), has refused to take the drugs since World Athletics introduced the rules in 2018.