Eliud Kipchoge has become the first athlete to run a marathon in under two hours.
During a specially arranged event in the Austrian capital, he completed the distance in one hour, 59 minutes and 40 seconds.
Two years ago in Italy, he was just 26 seconds short of the target.
He has succeeded this time helped by the excellent air quality in Vienna – and an almost completely flat route.
Al Jazeera’s Laurence Smith reports.
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