RUDISHA STARTS TITLE DEFENCE: Chepeng'etich also in action in 1,500m

Kenya's David Lekuta Rudisha runs in round one of the men’s 800m at the World Athletic Championships at the Bird's Nest stadium in Beijing, Saturday, Aug. 22, 2015. (AP Photo/David J. Phillip)

Olympic champion David Rudisha has not been in the best of form coming into the Olympics.
The world record holder has lost in a number of Diamond League races to compatriot Ferguson Rotich and also lost to youngster Alfred Kipketer at the Olympic trials in Eldoret.

But despite the poor showing by his high standards, Rudisha still comes to the Olympics with a world leading time (1:43.35) and that means his rivals will not be taking him lightly.