Usain Bolt returns to the track in Beijing's Olympic Stadium tonight looking to win the 200 metres World title to add to the 2008 Olympic gold medal he won at the same track.
Bolt squares off against Justin Gatlin and he will hope to win the title for the fourth time in a row.
The Jamaican holds the World Record over the distance and ran the quicket time ever in a World Chmapionships final six years ago.
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