DAN Biggar has pledged that Wales will ‘chance their arm’ with a daring approach when they take on Australia’s star-studded back line in the World Cup shootout at Twickenham.

The Wallabies head into the Pool A decider as favourites after smashing England 33-13 in London last weekend to eliminate the tournament hosts.

They boast a seriously dangerous back line with Will Genia, Bernard Foley and Matt Giteau pulling the strings for strike runners Israel Folau, Drew Mitchell, Tevita Kuridrani and Adam Ashley-Cooper, not to mention Matt Toomua and Kurtley Beale on the bench.

But Wales are no slouches themselves with George North moved into midfield, Liam Williams given licence to roam from the wing and flanker Justin Tipuric providing them with an extra player with the skills of a back.

The teams traded eight tries in an open encounter in Cardiff last autumn and more fireworks

Boss Warren Gatland pledged on Thursday that they would “throw something a little different at Australia” and fly-half Biggar echoed those sentiments.

“Knowing that we have qualified no matter what has put a relaxed mood in the camp,” said the Ospreys star, who has kicked 13 from 13 in the tournament.

“We can chance our arm once or twice a little bit but our same structure will remain to be physical, do our basics well, try and get over the game line and play some rugby.

“It's an exciting team selection and hopefully with doing our basics well we can get some of these exciting players on the ball and play some rugby.”

That is, of course, without being too loose against the classy Wallabies.

“Their backs are looking sharp and they played some really good rugby against England so it is going to take a heck of a defensive effort from us,” added Biggar.

“But we went to Twickenham and beat England in their own World Cup so we have got to go in there with plenty of confidence and back ourselves to come out on top.”

Wales and Australia have the carrot of an easier route to the final with the winners facing Scotland and Japan in the quarters, avoiding a last-eight showdown with South Africa and a potential semi-final against New Zealand.

Biggar is understandably not thinking about Boks, Scots or Brave Blossoms just yet, merely wanting to keep the feel-good factor after the hard-fought victories against England and Fiji that ensured qualification from a nightmare group.

He said: “Ourselves and Australia would feel a lot more comfortable and confident going into a quarter-final on the back of winning every pool match rather than off the back of a defeat.

“It's not the end of the world but it's about continuity, confidence and having the squad together and all being on a high.

“But we do want to top our pool. That was the ambition at the start of the tournament.

“Generally if you top the pool you get a slightly easier route through and miss the All Blacks, who are obviously the best team in the world.

“But come knockout rugby we would back ourselves against anybody.”