Caster Semenya and US prodigy Noah Lyles head the field at the first of the two Diamond League finals, in Zurich on Thursday. Semenya will look to wrap up the trophy in the women’s 800m while Lyles goes head-to-head with Turkey’s world and European 200m champion Ramil Guliyev. "My main aim tomorrow is win the trophy," said Semenya, the double Olympic champion and three-time world champion who is now unbeaten over the 800m since her elimination in the semifinals of the 2015 worlds in Beijing. But Semenya, 27, has also come under the spotlight this season off the track as she turned to the Court of Arbitration for Sport to challenge the IAAF rules on testosterone levels in female athletes to be introduced in November. Under the new regulations, "hyper-androgynous", athletes such as Semenya would have to chemically lower their testosterone levels to be able to compete, which the 800m runner says is discriminatory and in violation of the IAAF’s constitution and the Olympic Charter. "I r...

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