The pair had claimed two victories in their Pool D matches yesterday to leave them with a realistic chance of achieving a bye into the second round.

Their hopes were ended, however, by Germany’s Chantal Laboureur and Julia Sude, who secured the bye by defeating the Argentine pair 21-13, 26-24.

Gallay and Klug bounced back immediately, despite having to play the additional match, by overcoming Canada’s Jamie Broder and Kristina Valjas 21-18, 21-15.

Following their triumph, Gallay and Klug are now due take on Brazil’s Juliana Felisberta and Taiana Lima in the second round tomorrow.

The London 2012 bronze medallists emerged from Pool H unbeaten, with their final match seeing them record a 23-21, 21-17 victory over Barbara Hansel and Stefanie Schwaiger of Austria.

Second seeded Karla Borger and Britta Buthe also posted a 100 per cent record in pool competition to earn a bye.

The Germans, though, were forced to work hard in their contest with Riikka Lehtonen and Taru Lahti of Finland.

Borger and Buthe won the opening set 21-16 but came under pressure from the Finnish duo, who won the second 27-25 to force a decider

Borger and Buthe eventually had enough to come through the match by sealing the final set 15-11.

It sets them up with a tie against Greece’s Vasiliki Arvaniti and Penny Karagkouni.

The men's pool competition got underway today with Anders Mol and Christian Sorum of Norway providing the biggest shock by beating Russia's Rio 2016 bound players Viacheslav Krasilnikov and Konstantin Semenov.

The youthful Norwegians lost the opener 21-16 but hit back to win the remaining sets 21-18, 24-22.

They backed up their victory by beating Brazil’s Vitor Gonçalves Felipe and Álvaro Morais Filho 21-10, 24-22 to top Pool E.