Two years ago, a US quartet demoralised the field in the women's 4x400m, winning by nearly six seconds in a world-leading 3:19.02, the fastest time in the world since the 2012 Olympic Games held on the same London Stadium track. That performance produced, by far, the largest winning margin in the event at a World Championships. Although they may not be fielding as powerful a squad this time around, the USA still arrives in the Qatari capital poised to win a ninth title in the event.
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