USA women smash relay record
The USA women's team broke a 27-year-old world record after winning Olympic gold in the 4x100m relay on Friday night.
The American quartet of Tianna Madison, Allyson Felix, Bianca Knight and Carmelita Jeter clocked 40.82 seconds to smash the previous best, held by East Germany, by nearly half a second.
They also shattered the best-ever Olympic time which had stood for 32 years.
Jamaica's Shelly-Ann Fraser-Pryce - the individual 100m champion - Sherone Simpson, Veronica Campbell-Brown Kerron Stewart took the silver, with Ukraine claiming bronze.
Meanwhile, Great Britain's women have qualified for the final of the 4x400m relay at the Olympics Stadium.
The quartet of Shana Cox, Lee McConnell, Eilidh Child and Christine Ohuruogu ran 3 mins 25.05 secs as they came in third behind the USA and Russia.
An under-strength American team, who could bring in individual 400m champion Sanya Richards-Ross and 200m winner Felix for the final, won in a time of 3:22.09.
Jamaica cruised to victory in the other heat, with Ukraine second and France third.
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