21 May 2012 Last updated at 16:56

Oscar Pistorius rivalry excites Singleton

Amputee sprinter Jerome Singleton says his rivalry with Oscar Pistorius "is as big as Muhammad Ali v Joe Frazier" ahead of their 100m duel at the London Games.

The American beat the reigning Paralympic champion Pistorius at last year's World Championships in New Zealand but claims the 'Blade Runner' is like the "brother you want to beat".

Singleton tells BBC Sport's Matt Slater that amputee sprinting is currently "at a whole new level and competitors have a moral obligation to put on a great games".