With reigning champions Jamaica failing to finish after injury struck on the second leg, there was an opening for one of the teams.
The US women#8217;s team of Quanera Hayes, Allyson Felix, Shakima Wimbley and individual 400m champion Phyllis Francis were dominant winners, their 3 mins 19.02 secs the fastest time in the world in five years.
Britain#8217;s 4#215;400 metres women won a brilliant silver and the GB men bronze as the host nation finished the World Championships on a high.
But the medal rush on this final weekend casts a different light on the squad#8217;s performance, its five fourth places also a promise of what might be to come.
Obiri covered the last kilometre in 2 mins 45 seconds and the last lap in just 60 seconds, a remarkable display of distance running dominance.
The British quartet took it in style, once again the bankers for a nation that has always relished relay success.