Usain Bolt has won his first race in Europe in 2012. He ran a time of 10.04 seconds over 100 metres.
The Jamaican runner beat British sprinter Dwain Chambers and an international line-up at the Golden Spike event in Ostrava, Czech Republic.
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Find out what to expect from the weather if you are running in the big race in London or watching from the sidelines.
It will be a soggy start to the weekend and temperatures will drop making it feel colder than in recent days.