The 34-year-old, who won world bronze in Helsinki in 2005 and silver in Paris in 2003, secured her first global title by edging out Canada's Olympic bronze medallist Priscilla Lopes-Schliep.

CNN: Women's world champion Semenya faces gender test

Jones looked impressive, holding off the challenge from Priscilla Lopes-Schliep of Canada, to win the women's 100m hurdles in 12.63, while Jackson recorded 48.66 to beat fellow American Kerron Clement in the men's 400m.

BBC: Asafa Powell clocks 9.81 to win 100m in Doha