Semenya, a double Olympic champion over 800 meters, ran a meet-record time of 1:54.98 on Friday at the IAAF Diamond League event in Doha, Qatar, beating her nearest competitor by nearly 3 seconds.
Semenya, a 28-year-old who has been the dominant force in women’s middle-distance running, is hyperandrogenous, meaning she has elevated levels of testosterone.
Under an International Association of Athletics Federations policy scheduled to go into effect Wednesday, she would need to take medication to reduce her testosterone if she wants to compete internationally in women’s events between 400 meters and one mile.
Though the Court of Arbitration for Sport rejected Semenya’s challenge against the policy, she still could appeal the decision to the Swiss Federal Tribunal.
Semenya’s next step in the sport isn’t clear. Thursday, she cryptically posted an image with the following words: “Knowing when to walk away is wisdom. Being able to is courage. Walking away with your head held high is dignity.”