New 800 meters world champion Caster Semenya received a rousing welcome after touching down in Johannesburg with her South African team-mates on Tuesday. The 18-year-old, who made global headlines last week after doubts were raised over her gender at the World Championships, was accompanied by the country’s two other medallists from Berlin — men’s 800m champion Mbulaeni Mulaudzi and long-jump silver medallist Khotso Mokoena. Thousands of supporters crammed the OR Tambo International Airport — waving placards, singing, dancing and simply hoping to catch a glimpse of the teenage heroine