Borch and Prakaten left Tokyo 2020 with silver medals but now face missing Paris 2024 after a bad day on Serbian waters.

The Norwegian was in a tough heat as he could only finish fifth in a time of 7min 17.81sec.

Reigning world champion Oliver Zeidler of Germany emerged victorious from the quarter-finals after crossing in 7:06.01.

New Zealand’s Thomas Mackintosh was second in 7:08.33 with Japan’s Ryuta Arakawa coming third in 7:11.65.

Dutchman Simon van Dorp was the fastest quarter-final winner in 7:05.97, while reigning Olympic champion Stefanos Ntouskos of Greece and Denmark’s Sverri Nielsen also won their races.

"I had a very tough draw for the quarter-final," said Zeidler.

"It was kind of the race of the day, maybe more like a semi-final.

"It was a very good race, very tough conditions especially in the second 1,000 metres.

"It was very slow, so you really needed to have some power in the boat to pull away from the others.

"It was a bit difficult to come into racing here on Sunday, but now I feel ready and now the World Championships can really start."

There was also disappointment for Prakaten who finished 8:07.24 in her quarter-final that was won by New Zealand’s Tokyo 2020 gold medallist Emma Twigg in 7:52.44.

Prakaten switched from Russia to Uzbekistan in order to compete internationally but her hopes of qualifying for Paris 2024 have been dashed. 

Kara Kohler of the United States was just 0.03 short of that time in her quarter-final, while Australia’s Tara Rigney and Karolien Florijn of The Netherlands finished in 7:56.73 and 7:53.39 respectively to top their quarter-finals.

"It was another solid race and another step forward," said Twigg.

"When I saw [the quarter-final draw] I thought 'that’s going to be a challenge'.

"It gives me confidence moving forward."

Switzerland’s Jan Schaeuble and Raphael Ahumada starred in the men’s lightweight double sculls quarter-finals, winning by the biggest margin as they crossed the line in 6:52.35.

The quickest time was registered by Ireland’s Olympic and world champions Fintan McCarthy and Paul O’Donovan who won their race in 6:46.53.

Quarter-final two was decided by a photo finish as Dennis Carracedo Ferro and Caetano Horta Pombo won in 6:48.68 - just 0.19 ahead of Jiri Simanek and Miroslav Vrastil of the Czech Republic.

Norway’s Lars Benske and Ask Tjøm were the quarter-final winners in 6:51.36.

There was a thrilling men’s double sculls quarter-finals as Spain’s Aleix Garcia and Rodrigo Conde saw off challenges from Italian and Norwegian crews to win in 6:41.11.

Romania’s Florin Arteni and Ciprian Tudosa, The Netherlands’ Melvin Twellaar and Stefan Broenink and Croatia’s Martin Sinkovic and Valent Sinkovic were the other quarter-final winners.

There were more tickets secured for the Paris 2024 Paralympic Games in the Para rowing disciplines with the top two in both of the PR1 women’s singles sculls repechages sealing their places.

France’s Nathalie Benoît was first in the opening repechage, with China’s Rio 2016 Paralympic silver medallist Wang Lili coming second.

Ukraine’s Anna Sheremet and Germany’s Manuela Diening placed first and second respectively in the second repechage.

Competition is due to continue tomorrow.