The London 2012 will be all about some of the biggest rivalries in sports, and MSN Sports is here to point out the fiercest ones for you to keep an eye on.
Usain Bolt Vs Yohan Blake (Athletics)
That Usain Bolt is the world's fastest man used to be a no-brainer. But now he has been beaten in both the 100m and 200m events by fellow Jamaican Yohan Blake, at the Olympic trials. Don't be surprised if Bolt looks over his shoulder in London.