Jakob Ingebrigtsen has suffered deja vu at the world championships when beaten for 1500 metres gold by a Briton for the second straight time - but his compatriot Karsten Warholm gave Norway plenty to cheer with a third 400m hurdles triumph.
Olympic champion Ingebrigtsen took the lead early in Wednesday's metric mile final but Tokyo Games bronze medallist Josh Kerr was next to him on the final bend and then outsprinted and outbattled him on the home straight for a stunning victory in 3 minutes 29.38 minutes.
Ingebrigtsen got silver - just as in 2022 when he suffered a similar shock defeat against another less heralded Briton Jake Wightman - clocking 3:29.65, a mere three-hundredths ahead of another Norwegian Narve Gilje Nordas.
Kerr celebrated his biggest career success, receiving his medal from World Athletics president Sebastian Coe, the British middle distance great who won Olympic gold in the discipline in 1980 and 1984.
"It's been a long time coming. It's quite an overwhelming experience. I'm so proud of myself," Kerr said.
"I didn't feel like I ran the best race. I just threw my whole 16 years of this sport in that last 200 metres and didn't give up until the end."
A disappointed Ingebrigtsen shrugged: "I wasn't my best race. Respect for Josh. It wasn't my day."
Olympic champion and world record holder Warholm had managed only seventh last year but was back on top again on the night when he ran away from all rivals on the home stretch, clocking 46.89 sec and adding another gold to the ones he'd won in 2017 and 2019.
Kyron McMaster took silver, the first ever championship medal for the British Virgin Islands, while perennial runner-up Rai Benjamin, of the US, had to settle for bronze. Brazilian title holder Alison dos Santos of Brazil came fifth.
Victory for Warholm came after he appeared to have faced disqualification in the semi-finals, with slow-motion suggesting he illegally went around one hurdle instead of over it as required with his left leg.
Italy reportedly lodged a protest, as Alessandro Sibilio was the fastest non-qualifier, but Warholm was not sanctioned.
"There were people who thought I should be disqualified in the semis but it didn't happen," said Warholm.
"This means a lot. Last year I was injured. I was able to stay calm and keep my rhythm."
History also repeated itself in the women's pole vault, when American title holder and Olympic champion Katie Moon and Australia's Nina Kennedy decided to share gold instead of a jump-off after a tie on 4.90m and both missing 4.95 on all three attempts.
Marileidy Paulino of the Dominican Republic struck women's 400m gold after silver at the 2021 Olympics and 2022 worlds in a personal best 48.76, finishing well clear of Poland's Natalia Kaczmarek and Barbadian Sada Williams.
In preliminary action, Americans Sha'Carri Richardson and Noah Lyles started part two of their quest for world championship sprint doubles when the 100m champions breezed into the 200m semi-finals by winning their heats.
Kenya's Faith Kipyegon renewed her rivalry with Dutch Sifan Hassan as both stars advanced into the 5000m final along with title holder and Saturday's 10,000m winner Gudaf Tsegay of Ethiopia.
Kipyegon won a third 1500m gold the previous day with Hassan third and, as 5000m world record holder, has a good chance to become the first woman to achieve the 1500/5000m double at the worlds.
