TOKYO, Aug 7 — Allyson Felix brought the curtain down on her glittering Olympic career with a seventh gold medal as the United States stormed to a crushing victory in the 4x400m women's relay today.

Felix, who on Friday became the most decorated female track and field athlete of all time with a bronze in the individual 400m, helped a 'Dream Team' US quartet romp home in 3min 16.85sec.

Poland took silver, while Jamaica took bronze.

The USA fielded a star-studded line-up which included world record-breaking 400m hurdler and newly crowned Olympic champion Sydney McLaughlin, 400 hurdles silver medallist Dalilah Muhammad and teenage 800m gold medallist Athing Mu alongside the veteran Felix.

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With McLaughlin getting the American women off to a blistering start before handing off to Felix on the second leg, it soon became clear that the US quartet were racing against history and the Soviet Union's 33-year-old world record of 3:15.17 set at the drug-tainted Seoul Olympics. 

But while Muhammad built up a massive lead for Mu with a blistering third leg, the record remained just out of reach with the 19-year-old from New Jersey crossing the line four seconds clear of Polish anchor runner Justyna Swiety-Ersetic.

Felix, 35, is competing in her fifth and final Summer Games and now has 11 total Olympic medals, extending her record as the most decorated female track and field Olympian in history.

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Her 11th medal also took Felix one clear of Carl Lewis' 10 medals as the most decorated US track and field Olympic athlete. — AFP