Yohan Blake
Jamaican star Yohan Blake is going to give Usain Bolt a run for his money in London. Bolt and Blake have been training together for four years, and as far back as 2008, Bolt was telling the media to "keep an eye" on Blake. The first-time Olympian won the 100- and 200-meter sprints at the Jamaican Olympic Trials after besting Bolt in the 100 at the 2011 world championship. With Bolt ailing, Blake could be the one to beat in the 100.