The United States stormed to victory in the women's 4x400 metres relay at the World Championships after leading from the start to clock a world leading time.
US Olympic champion relay runner Phyllis Francis opened a comfortable lead before passing the baton to Sydney McLaughlin, silver medallist in the 400m hurdles at the worlds in Doha.
The US lead was retained by 400m hurdles world champion and world record holder Dalilah Muhammad, allowing Wadeline Jonathas to close out the race in 3 minutes 18:92 seconds.
Poland finished almost three seconds behind the United States, winning silver in a national record time of 3:21.89.
Jamaica finished third but were later disqualified for a changeover violation, allowing fourth-place finishers Britain to claim bronze with a season's best time of 3:23.02.
Kenyan Timothy Cheruiyot outclassed a field including two Olympic champions to win the men's 1,500 metres at the world championships after taking silver two years ago.
The 23-year-old had a huge lead at the bell and never looked in danger over the final lap as he strode home in three minutes 29.26 seconds, more than two seconds clear, to claim Kenya's fifth straight win in the event.
Algeria's Taoufik Makhloufi, the 2012 Olympic champion, led the chasing pack to take silver in 3:31.38, delighting a noisy, flag-waving group of fans from the North African country on the first bend. Marcin Lewandowski set a Polish record to claim bronze.
Cheruiyot, also a silver medallist at the African Games and Commonwealth Games last year, said he took the initiative to avoid being jostled.
"You see that there is a lot of pushing so we were trying to avoid the challenges," he told reporters.
"I felt the support of Kenyans in the crowd and it was amazing. The Olympic season is coming so I need to work harder."
Uganda's Joshua Cheptegei triumphed after a close battle in the 10,000 metres , winning his first world title and bringing his country their second medal of the championships.
Cheptegei remained near the front of the pack for most of the race and surged in the final kilometre to pass leader Rhonex Kipruto before holding off Ethiopia's Yomif Kejelcha to finish in a world leading time of 26 minutes 48.36 seconds.
"It really means a lot to me," said Cheptegei, who won silver in 2017 behind Britain's Mo Farah. "I've never been a world champion in the track. It's really a special moment.
Malaika Mihambo took an all or nothing gamble as she soared to the world championship long jump gold, with a leap the German said she may never see again.
Owner of the three best jumps of the season coming into the worlds, Mihambo made it four by flying 7.30 metres to land on top of the podium, adding the world title to her European crown.
"In training I don't remember having managed a jump like that," said Mihambo. "Today I showed I am capable of such a great jump. I am over the moon."
Ukraine's Maryna Bekh-Romanchuk took silver with 6.92m, edging out Ese Brume by one centimetre, the Nigerian having to settle for bronze.
