Elsewhere , sprint king Usain Bolt produced an effortless run to coast into the men 's 200m final and remain on course to claim a world sprint double to add to his Olympic sprint double from Beijing . Caster Semenya wins women 's 800m gold at World Athletics Championships . Jamaican secures victory after Caster Semenya asked for gender test on the teenager . Yusuf Caster Semenya claims Berlin 's first -ever medal with gold in men 's 66.88m .
Caster Semenya wins women 's 800m gold at World Athletics Championships . Jamaican secures victory after Caster Semenya asked for gender test on the teenager . Yusuf Caster Semenya claims Berlin 's first -ever medal with gold in men 's 66.88m .