Eduarda and Elize Maia were one of the home duos to progress as they saw off Argentina's 20th-seeded Maria Julia Benet and Virginia Zonta 21-7, 21-9 in just 25 minutes.

The pairing of Carol and Ana Patricia also made it through for Brazil after their win over compatriots Josemari Alves and Vanilda Leao, 21-19, 25-27, 15-10.

Joining them will be Rebecca Silva and Liliane Maestrini, 21-17, 21-14 winners over Americans Brittany Hochevar and Jennifer Fopma, and the pairing of Juliana and Lima who beat Germany’s second-seeded Laura Ludwig and Kira Walkenhorst, 21-7, 16-21,15-10.

Angela Vieira and Rachel Nunes Antunes completed the good day for Brazil, seeing off Americans Lane Carico and Summer Ross 21-14, 21-13.

Brazil's top seeds, Agatha Bednarczuk and Barbara Seixas, are out, however, with the FIVB world champions losing 21-17, 18-21, 15-13 to the US pairing Emily Stockman and Amanda Dowdy.

The home success bodes well for Brazilian hopes at Rio 2016, when beach volleyball is expected to be among the most popular sports.

In the men's competition, seven countries will contest tomorrow's quarter-finals including two home pairings.

George Souto Wanderley and Joalisson Gomes defeated Canada’s fourth-seeded Josh Binstock and Sam Schachter, 21-19, 18-21, 18-16.

Their team-mates Oscar Brandao and Andre Loyola came through against another Canadian team, Grant O’Gorman and Sam Pedlow, to win in two sets 21-10, 21-19.