The big clashes to watch

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100 and 200m: Usain Bolt (JAM) v Tyson Gay (USA)

Mouthwatering is often an over-used expression when it comes to head to heads in sport but this time the description is more than apt. The Olympic champion at both distances as well as world record holder Bolt up against the dominant sprinter of two years ago, Gay, who won both these events at the previous edition of the World Championships. They have not met this season but that could be a good thing saving it for the biggest stage for athletics this year. Gay, who turns 27 on Aug 9, was not fit at the Olympics, failing even to make the 100m final. Fully fit this time around he should prove to be a worthy opponent for the charismatic 22-year-old Jamaican showman.