David Rudisha - Kenya
Name: David Lekuta Rudisha
Kenya's David Rudisha isn't just the world record holder in the 800m - he holds five of the ten fastest times in history. Gold medal winner at the World Championships in 2011, he was also the World Athlete of the Year in 2010. Unsurprisingly, Rudisha is the overwhelming favourite to capture the 800m gold in London and continue Kenya's long history of success at middle distance.