Samoa's upset win over the Wallabies sparked a big surge in ticket sales for their Rugby World Cup clash with South Africa, making it just the fourth game at the tournament to sell out.

The Samoa-Springboks pool game in September joins the tournament final and pool matches between New Zealand and France, and France and Canada as sell-outs.

The Samoans made the rugby world sit up and take note when they steamrolled the Wallabies 32-23 on in Sydney on Sunday.

A World Cup spokeswoman said demand for tickets for their World Cup clash with the Springboks at the 30,000 seat North Harbour Stadium in Auckland and their other games increased rapidly after the historic victory.

Auckland has a large Samoan population who have clearly sensed their team has a real chance to advance to the quarter-finals.

"There's been an increase in demand to Samoa matches since the result. Samoa-Fiji and Samoa-Wales are also both selling really well," said the spokeswoman.

Inspired Samoa out-scored Australia four tries to two to post their first-ever win over the Wallabies in front of almost 30,000 fans at ANZ Stadium.

The victory reversed Australia's 74-7 trouncing of Samoa in their last meeting with the Pacific Islanders at the same venue six years ago.

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