German duo Kim Behrens and Sandra Ittlinger, who are seeded at 23, led the charge with a 15-21, 22-20, 15-13 win over tenth-seeded Brazilian pair Agatha Bednarcuk and Eduarda Lisboa.

They then secured the Pool G title by defeating Joy Stubbe and Marleen van Iersel of The Netherlands 21-16, 21-12.

Stubbe and Van Iersel had beaten seventh seeded Swiss pairing Joana Heidrich and Anouk Verge-Depre earlier in the day,

Another outsider German pair also caused a shock as Karla Borger and Margareta Kozuch secured the Pool E title thanks to a 21-18, 21-17 win over 12th seeds Alix Klineman and April Ross of the United States, followed by a 21-15, 21-14 victory against Ukrainians Valentyna Davidova and Ievgeniia Shchypkova.

Davidova and Shchypkova had recorded a surprise victory over Brazilian duo Maria Antonelli and Carolina Algado prior to their loss to Borger and Kozuch.

In the men's draw, Olympic champions Alison Cerutti and Bruno Schmidt of Brazil set up a match against Rio 2016 bronze medallists Alexander Brouwer and Robert Meeuwsen of The Netherlands.

Sixth seeds Cerutti and Schmidt recorded a 21-18, 16-21, 15-10 win over Swiss qualifiers Nico Beeler and Marco Krattiger whilst Brouwer and Meeuwsen, who are seeded at 11th, came out 21-14, 21-14 winners against Russian duo Maxim Sivlap and Artem Yarzutkin.

Tomorrow's match will be the first time that Cerutti and Schmidt and Brouwer and Meeuwsen have met since the Olympic semi-finals two years ago.

Elsewhere, number one seeds Phil Dalausser and Nick Lucena of host country the US got their campaign off to a good start with a 21-15, 21-11 win against Hendrik Nikolai Mol and Mathias Berntsen of Norway, whilst Italian Olympic silver medallists Daniele Lupo and Paolo Nicolai beat Americans Casey Patterson and Stafford Slick 21-16, 21-17.

Tomorrow will see all but one of the final men's pool matches take place along with the rest of the women's pool games.

Later in the day, the women will start their elimination round ties.