Lausanne — The Court of Arbitration for Sport (CAS) said on Tuesday it had opened a probe into Caster Semenya’s challenge of controversial new International Association of Athletics Federations (IAAF) rules on testosterone occurring in female athletes. CAS said it had "registered a request for arbitration" filed by the South African two-time Olympic gold medallist against the IAAF’s "eligibility regulations for female classification (athletes with differences of sex development) that are due to come into effect on November 1 2018". The CAS said Semenya sought a ruling "to declare such regulations unlawful and to prevent them from being brought into force. An arbitration procedure has been opened." In April, the IAAF announced its new rules targeting women who naturally have unusually high levels of testosterone, arguing that hyperandrogynous competitors enjoy an unfair advantage. Athletes classified as "hyperandrogynous", such as Semenya, will have to lower their testosterone levels...

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