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Team USA posted the fastest time in the women's 4x400-meter relay to qualify for Saturday's final.
Despite not having Sydney McLaughlin, who sat out the qualifying heat, the American quartet of Quanera Hayes, Shamier Little, Aaliyah Butler and Kaylyn Brown finished in 3:21.44 to win the first heat.
Great Britain finished second overall, followed by France, Jamaica and Belgium rounding out the top five.
Here are the results from both qualifying heats from Friday.
4x400-Meter Qualifying - Heat 1
- United States: 3:21.44
- Great Britain: 3:24.