Caster Semenya to challenge ‘unfair’ testosterone ruling

South African athlete Caster Semenya says she will challenge an “unfair” testosterone ruling imposed by athletics’ governing body the IAAF.

The World and Olympic 800m champion will fight the ruling at the Court of Arbitration for Sport, which will see some female runners with naturally high testosterone levels having to race against men, or change events, unless they take medication.

Semenya, 27, said: "It is not fair. I just want to run naturally, the way I was born. I am Mokgadi Caster Semenya. I am a woman and I am fast."

The rule, which comes into force on 1 November, applies to women who race in track events from 400m up to the mile.