Usain Bolt returns to the Olympic Stadium tonight looking to revive memories of London 2012 and at the same time lift the gloom hanging over athletics.
The Jamaican is the headline act on the first day of the Sainsbury's Anniversary Games, which will see the east London venue welcome back many of the stars who graced it last summer.
Sprinters Tyson Gay and Asafa Powell, whose failed drug tests have shaken the sport, will not be among the big names in action.
Bolt was bombarded with questions on the doping issue when he faced the media yesterday and admitted: "It's going to set us back a little bit."
He added: "I was made to inspire people and to run. I know I am clean. So I'm just going to continue running, using my talent and trying to improve the sport and help the sport."
Tonight he will race over 100 metres at the stadium where he won three Olympic gold medals last summer, with Britain's newest sprint star James Dasaolu among his opponents.
Jessica Ennis-Hill has confirmed she is fit to compete tomorrow in the 100m hurdles and the long jump, having only made her long-awaited comeback from an Achilles tendon injury on Tuesday.
