The American team beat Louise Bawden and Taliqua Clancy of Australia 21-16, 21-13 to secure a third straight win at the tournament at the Red Bull Beach Arena on Danube Island.

It saw them emerge as the Pool K winners, with Fredrick expressing her view that they are hitting form at the right time.

"We had a great game plan and executed well," she said.

"April served really, really well.

"As soon as we partnered up we both were talking about World Champs and that being our big goal of the year.

"Obviously, a little hiccup in there with April’s toe injury, but we’ve gotten better with each match and we are getting in a good rhythm."

The Czech Republic’s Barbora Hermannova and Marketa Slukova quickly followed the American's by winning Pool F before their compatriots Kristyna Kolocova and Michala Kvapilova won Pool L.

Maria Antonelli and Carolina Salgado triumphed in Pool I, while their fellow Brazilians Taiana Lima and Eliza Maia were confirmed as the Pool H victors.

Four further women’s pools are due conclude tomorrow, with top seeded Talita Antunes and Larissa Franca of Brazil seeking to wrap up top spot in Pool A.

Brazil’s Alison Cerutti and Bruno Oscar Schmidt played their first match of the men’s tournament as they seek to defend the title won at The Hague in 2015. 

The duo secured a hard fought 21-19, 21-19 win over Latvia’s Martins Plavins and Haralds Regza in Pool E.