Usain Bolt and Yohan Blake comfortably through to 200m final

Usain Bolt eases into the 200m final in a time of 20.18 seconds to keep alive his hopes of completing the sprint double at the London Olympics.

The 100m champion will be joined in the final by Jamaican rival Yohan Blake, who won the first semi-final in 20.01secs.

But Great Britain's Christian Malcolm failed to qualify for Thursday's final after finishing third in his heat.

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