A top European court will decide on Thursday whether double Olympic champion Caster Semenya can be required to lower her testosterone levels to compete as a woman in a key decision on contested gender testing.
The European Court of Human Rights decision comes after a row engulfed the 2024 Paris Olympics over the gender of an Algerian boxing champion.
South African runner Semenya 34 was the Olympic 800m champion in 2012 and 2016 and a world gold medallist in 2009, 2011 and 2017.
She is classed as having differences in sexual development but has always been legally identified as female.
Semenya has refused to take drugs to reduce testosterone levels since World Athletics, Track and Fields governing body, introduced new rules on women competitors in 2018.