The German pairing triumphed 22-20, 27-25 in Apeldoorn to set up a last-eight encounter with Spain's Liliana Fernández Steiner and Elsa Baquerizo McMillan, 21-14, 21-13 winners over Czech Republic's Martina Bonnerová and Sarka Nakladalova.

Sude and Laboureur had earlier defeated Finland's Taru Lahti-Liukkonen and Anniina Parkkinen 24-22, 22-20 in the round of 24.

Second seeds Barbora Hermannová and Marketa Slukova of the Czech Republic are also through to the quarter-finals after overcoming Finland's Riikka Lehtonen and Niina Ahtiainen 21-10, 21-11.

Next up for them are Russia's Ekaterina Birlova and Evgenia Ukolova, who beat Dutch duo Jolien Sinnema and Laura Bloem 21-18 18-21,15-8.

Hosts The Netherlands will be represented in the quarter-finals by Sanne Keizer and Madelein Meppelink thanks to their surprise 21-16, 21-14 victory over third seeds Zoé Vergé-Dépré and Anouk Vergé-Dépré of Switzerland 

Standing between them and the last eight are Spain's Amaranta Fernández Navarro and Angela Lobato Herrero, 21-17, 21-17 winners at the expense of Germany's Kim Behrens and Sandra Ittlinger.

The one other quarter-final pits fourth seeds Victoria Bieneck and Isabel Schneider of Germany against fifth seeds Tanja Hüberli and Nina Betschart of Switzerland.  

Bieneck and Schneider defeated Ukraine's Valentyna Davidova and Ievgeniia Shchypkova 21-17, 21-19, while Hüberli and Betschart overcame Germany's Karla Borger and Margareta Kozuch 18-21, 21-16, 15-9.

The quarter-finals are scheduled to take place tomorrow. 

In the men's event, defending champions Paolo Nicolai and Daniele Lupo qualified for the round of 24 despite suffering a second defeat in as many days in Utrecht. 

The top-seeded Italians finished third in Pool A after losing 21-18, 14-21, 12-15 to Czech Republic's Ondrej Perusic and David Schweiner.

In order to reach the round of 16, they must find their way past Switzerland's Adrian Heidrich and Mirco Gerson, the Pool D runners-up following a 21-19, 21-16 win over The Netherlands' Dirk Boehlé and Steven van de Velde.

Perusic and Schwiner ranked second in Pool A behind Switzerland's Nico Beeler and Marco Krattiger, who themselves lost to Serbia's Lazar Kolaric and Stefan Basta 21-14, 17-21, 13-15 today. 

Second seeds Alexander Brouwer and Robert Meeuwsen secured first place in Pool B and a straight passage through to the round of 16 after the Dutch pairing made it three wins out of three with a 21-14, 30-28 triumph over Poland's Maciej Rudol and Kacper Kujawiak. 

Belgium's Dries Koekelkoren and Tom van Walle clinched the runners-up spot by beating Turkey's Murat Giginoglu and Volkan Gögtepe 21-19, 21-18.

Brouwer and Meeuwsen will face the winner of the round-of-24 match between third seeds Clemens Doppler and Alexander Horst of Austria and France's Quincy Aye and Youssef Krou.

The round-of-24 ties are scheduled for tomorrow along with two of the eight round-of-16 clashes.