Usain Bolt was beaten by American Christian Coleman his semi-final hours before the final to be staged two and a half hours later.
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Coleman took off running leaving Bolt to react quickly to catch him just before the finish line, both 9.97 and 9.98. respectively.
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He is seeking his fourth gold in the event, having won at every world championships since 2009 apart from 2011 in Daegu when he was disqualified for a false start.
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