800M
![](https://magazineclonerepub.azureedge.net/mcepub/1126/134759/image/666b390a-2c6a-484c-b3e9-b6669bd1862f.jpg)
Mariya Savinova is not in Rio to battle with Caster Semenya as in Daegu in 2011
FORMER world champion Caster Semenya has proved unbeatable in 2016 and can draw upon the best 400m speed and the strongest 1500m endurance of all the contenders in Rio.