After temporarily suspending the Court of Arbitration of Sport’s (CAS) ruling that Caster Semenya not be allowed to compete under the IAAF’s rules on testosterone, the Swiss supreme court on Tuesday reversed their decision from June 3 that had allowed the two-time Olympic 800m champion to run without restriction.

Caster Semenya “very disappointed” after Swiss Supreme Court reverses ruling that suspended IAAF regulations pending her appeal against CAS ruling that backed IAAF. Means she will be prevented from defending her title at World Championships in Sept but she vows to continue appeal pic.twitter.com/ec1AGm0YM5

— Dan Roan (@danroan) July 30, 2019

Effectively, this means that the South African will not be allowed to defend her world title from 2017 as she has repeatedly stated that she will not take hormone suppressants. Semenya last raced on June 30 at the Prefontaine Classic, which she won in 1:55.70.

Semenya’s 1:54.98 from the Doha Diamond League on May 3, run two days after CAS upheld the IAAF’s restrictions on athlete’s like Semenya with differences of sexual developments (DSD) from competing in the 400m through mile distances, still stands as the world lead for 2019.