Chambers thanks crowd

Dwain Chambers spoke of his relief after booking his place in the men's 100m semi-finals with an impressive display in his heat.

The controversial 34-year-old, able to compete at the Olympics after the Court of Arbitration for Sport overturned a life ban for doping, posted a time of 10.02 seconds in heat seven, beating Jimmy Vicaut of France and Trinidad and Tobago's Keston Bledman. "You don't understand how nervous I was. I am glad to get through the heat - the roar of the crowd was amazing. It inspired me and I can see how much of an impact it was having on people like Jess (Ennis)," said the British sprinter. "You can train all year but ultimately, you have to run fast at the championships and I have been taking it step-by-step to get here. I am really happy to be here. It is a fast track and I need to get through the rounds." Elsewhere in today's heats at the Olympic Stadium, defending champion Usain Bolt eased through in a time of 10.09, while world champion Yohan Blake ran 10.00 to book his place in the semi-finals. Tyson Gay and Justin Gatlin were impressive in qualifying - Gay winning his heat in 10.08 and Gatlin posting a time under 10 seconds - while British duo Adam Gemili (10.11) and James Desaolu (10.13) also qualified for Sunday's semis.