DURBAN: Caster Semenya powered to an impressive double at the South African championships Sunday, winning the 800 meters and 1,500 meters in the buildup to defending her 800 title at the 2011 world championships.The world champion, formerly at the center of a gender-test controversy, was far too strong for the 800 field at Durban’s Kings Park Athletics Stadium. She led from the start and ran away from defending champion Mapaseka Makhanya to win in 2 minutes, 2.10 seconds. – TOI