Australia went through day one of the Women's World Rugby Sevens in Sydney unbeaten along with New Zealand and Russia ©Getty Images

New Zealand, Russia and hosts Australia went unbeaten on the opening day of the Women’s World Rugby Sevens Series in Sydney.

The teams all cruised into the quarter-finals after all three won every game they played today at the Allianz Stadium.

Australia, the gold medallists at the 2016 Olympic Games in Rio, started off with a 24-7 win over Brazil before keeping their defence unpenetrated against Ireland with a 29-0 victory.

Their last group game in Pool B was against Fiji and it was a tougher task, but the hosts still came out on top with a score of 26-17.

In Pool A, New Zealand’s day began with a comfortable 34-5 win over Papua New Guinea.

However, they then came up against the French and it took a try from Kelly Brazier to see the Black Ferns achieve a 14-12 victory.

Renee Wickliffe of New Zealand is tackled by Canada's Charity Williams ©Getty Images
Renee Wickliffe of New Zealand is tackled by Canada's Charity Williams ©Getty Images

The Olympic silver medallists then went on to beat Canada 31-10 to confirm their place at the top of the group.

Russia conceded just 20 points on their way to winning Pool C, with half of those coming in their first win of the day against the United States, which finished 19-10.

They then put Spain and England to the sword with scores of 24-5 and 31-5 respectively.

Tomorrow will see the round come to a conclusion along with the start of the men’s side of the competition.

The quarter-finals see New Zealand face another clash with France, while Australia will play Fiji again.

Russia are up against Canada while Ireland and the US will battle for the last semi-final spot.