“The court today ordered the IAAF to suspend immediately the implementation of the regulation with regard to Caster and has given the IAAF until the 25th of June to respond to the suspense of effect,” Semenya’s lawyer Greg Nott to a 707 South African radio station on Monday.
"We brought an application for suspension of the regulations which today we learnt was successful."
"The Swiss Supreme Court has granted welcome temporatry protection to Caster Semenya. This is an important case that will have fundamental implications to human rights of female athletes." Swiss counsel Dr. Dorothee Schramm said.
"I hope following my appeal I will once again be able to run free," Semenya said.
"I am thankful to the Swiss judges for this decision."
The Swiss Court rulling means that Caster Semenya who was affected by the 'Eligibility Regulations for the Female Classification for athletes with differences of sex development', will not need to take testosterone-reducing medication to compete.
The IAAF ruling would have affected women competing from 400m to the mile.
Last month the Court of Arbitration for Sport (CAS) rejected Semenya’s appeal of the IAAF testosterone regulations.
Semenya, didn't race the 800m at last week's Stockholm Diamond League because she has said she will not take medication to lower her testosterone levels.