The United States are among three countries unbeaten after the pool stage of the World Rugby Sevens Series in Cape Town ©Getty Images

Hosts and reigning series champions South Africa are one of three unbeaten teams heading into the knockout stages of a sold-out World Rugby Sevens Series in Cape Town.

The Blitzboks, England and United States all progressed to the quarter-finals unbeaten after taking three wins from three in the pool stages at the Cape Town Stadium. 

South Africa are due face Fiji in the final eight, reigning Cape Town champions England play New Zealand, Canada face France and US play Argentina.

South Africa are targeting their second tournament win in as many weeks after taking glory in the opening round of the World Series in Dubai on Sunday (December 3). 

A highlight of the day for the 47,000 strong home crowd was Seabelo Senatla becoming the fastest player to reach 200 World Series tries, achieving the milestone in just 35 tournaments.

"It's been a surreal day for me," said Senatla. 

"The reception I got was amazing today and to play in my home town was incredible. 

"The crowd was sensational."

The big surprise was that Australia failed to reach the knockout stages.

They won only one of their three matches - beating Spain 36-12 - but losing 31-14 to the US and 35-12 to neighbours New Zealand.

England, who beat South Africa 19-17 in the final of this last year, conceded just 14 points in the pool stages but head coach Simon Amor claimed they can do better. 

"I didn’t think we played particularly well but there’s a lot of heart shown which is key in this game," he said. 

"The effort and the attitude was excellent, but our sevens wasn’t as good as it should be."

In the Challenge Trophy quarter-finals, Kenya face Samoa, Scotland play Spain, Wales face Russia and Uganda go up against Australia.