Caster Semenya
Before the Court of Arbitration for Sport (CAS), South African middle-distance runner and two-time Olympic champion Caster Semenya had challenged a rule by World Athletics — formerly known as the International Association of Athletics Federations (IAAF) — requiring her to undergo hormonal drug interventions to address naturally occurring testosterone production.

When she lost the case, she turned to Sidley for help in appealing the CAS ruling before Switzerland’s Federal Supreme Court. The Sidley team succeeded in suspending implementation of the eligibility regulations against Ms. Semenya. However, in July 2019, a single judge of the Swiss Supreme Court denied Ms. Semenya’s request to maintain the suspension of the CAS ruling in place during the entire appeal proceedings. While this means that Ms. Semenya will be unable to compete internationally while her appeal is pending, she said, “This will not deter me from continuing my fight for the human rights of all of the female athletes concerned.” The Swiss Supreme Court is currently considering Ms. Semenya’s appeal and is expected to render a decision soon. To read more about Sidley’s work on behalf of Ms. Semenya, click here.