Caster Semenya blocked from competing at world championships

• Athlete expresses disappointment after court ruling
• Swiss supreme court reverses earlier judgmentCaster Semenya will not compete at the World Championships in Doha after a Swiss court stood behind an IAAF rule that would require her to take testosterone-reducing medication.The South African had been expected to defend her world 800m title in late September after the Swiss Supreme Court had temporarily exempted her from an IAAF rule relating to athletes with differences in sexual de