Usain Bolt wins gold in 4x100m relay

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Usain Bolt completes hat-trick of gold medals as Jamaican left his rival behind in 4×100 meter relay.

In a race littered with mistakes, the United States were disqualified, leaving China to win silver and Canada to take bronze as Jamaica cruised home in 37.36 seconds.

Bolt and Jamaica have won every global championship gold medal since the 2008 Summer Olympics