U.S. advances in 4x400 women's relay, Poland flexes muscles again

TOKYO, JAPAN - AUGUST 05: Lynna Irby of Team United States competes in the Women's 4 x 400m Relay heats on day thirteen of the Tokyo 2020 Olympic Games at Olympic Stadium on August 05, 2021 in Tokyo, Japan. (Photo by Christian Petersen/Getty Images) (Getty Images, 2021 Getty Images)

TOKYO -- The United States easily advanced to the final of the women's 4x400m relay on Thursday, winning its heat in a scorching 3:20.86.

The 2016 gold medalist and reigning world champion had a slight lead going into the final leg and anchor Lynna Irby charged through the last lap to win the heat by more than a second, with Jamaica and Britain also advancing.

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Poland won its heat in 3:23.10, in another impressive performance after its upset win in the inaugural mixed event last week, as Cuba finished second and Belgium third in a national record 3:24.08.

Six-time Olympic gold medalist Allyson Felix is expected to join the U.S. team for Saturday's final, in her fifth and final Games.