Justin Gatlin gave away race to Usain Bolt - Michael Johnson

BBC Sport's Michael Johnson says Justin Gatlin "gave away" the 100m final at the World Athletics Championships in Beijing as Usain Bolt won in 9.79 seconds.

Four-time Olympic gold-medal winner Johnson tells Gabby Logan that Gatlin "committed the cardinal sin of not holding his form" in the final metres, allowing Bolt to pip the American on the line.

Bolt described winning his third world 100m title as the "hardest race" of his career.

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