400m hurdles

Sydney McLaughlin smashes world record to win gold in women's 400m hurdles final

The USA's Sydney McLaughlin has set a new world record with a phenomenal run in the women's 400m hurdles final. The new Olympic champion broke her own world-best mark of 51.90, storming past compatriot Dalilah Muhammad down the home straight to win the Olympic gold medal in 51.46 seconds.

Muhammad - the Rio 2016 Olympic champion - took silver, going under 52 seconds in a time that also broke the former world record (51.58). Femke Bol of the Netherlands finished third in a new European record of 52.03.

Dalilah Muhammad breaks 400m hurdles world record at US National Championships

The 29-year-old took more than a tenth of a second off a record that had stood for 16 years, clocking 52.20 seconds to beat Russian Yuliya Pechonkina's previous mark of 52.34.

"I'm just shocked," said Muhammad.

"I've been kind of hitting that time in practice and my coach was like 'there's no way you can't do it'."

Nineteen-year-old Sydney McLaughlin was second in 52.88 and Ashley Spencer third in 53.11. All three qualified for the World Championships in Doha in September, where they will be joined by reigning world champion Kori Carter in a formidable US quartet.