RIO 2016: US women's relay team run bizarre solo race to qualify for final

The United States women's 4x100m relay team has qualified for Saturday's final after they received a second chance post protest and ran a bizarre solo qualifying race.

With no other teams on the track, the Americans posted the fastest qualifying time of 41.77sec and knocked ninth-fastest China (42.70) out of the final.

Earlier in the heats, the Americans didn't get passed the first baton changeover after Allyson Felix appeared to stumble and dropped the baton.

Replays showed how Felix lost balance after a Brazilian runner impeded on her lane and elbowed her. Brazil was later disqualified.

"I got bumped coming into the exchange zone and it completely threw me off balance," Felix said.

"I tried to hold it together to get to English (Gardner). Maybe if I had one more step I could've, but I was falling."

Felix was a member of the relay team to set a new world record of 40.82 at the 2012 London Olympics.

The US team will get a chance to defend its title at 11.15am on Saturday.

Jamaica (41.79) and Great Britain (41.93) will be their main rivals.