South Africa's Caster Semenya powers to Olympic women's 800m gold

South Africa's Caster Semenya has won Olympic gold in the women's 800m at Rio, with Great Britain's Lynsey Sharp finishing sixth and missing out on a medal.

Semenya, 25, set a national record to win in one minute 55.28 seconds and finish well clear of silver medallist Francine Niyonsaba of Burundi.

Kenya's Margaret Nyairera Wambui, meanwhile, took the bronze medal, while Team GB's Sharp set a new personal best of 1:57:69.

Semenya, who has been subject to gender testing and was diagnosed with hyperandrogenism, won silver at London 2012.