Defending world champion United States was knocked out from the  Olympic 4x400m mixed relay on Friday after facing disqualification in its heat over a flawed baton changeover beyond the permitted zone.

Nine-time Olympic champion Allyson Felix did not take part in the USA’s heat. Instead Elija Godwin, Lynna Irby, Taylor Manson and Bryce Deadmon turned up for the US who was considered firm favourite for the gold medal. Allyson was, however, poised to return for a 10th Olympic medal had USA made it to Sunday’s final.

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The disqualification cut short Allyson’s opportunity to become the most decorated female athlete in track and field history as she remains joint-top with nine Olympic medals.

LATEST UPDATE: The US team has been reinstated after a success full appeal.

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Tokyo Olympics: US mixed relay team reinstated after appeal