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KANGAROOS coach Tim Sheens has declared Australia's group stage experimenting a success, but says he's nursing a serious selection headache heading into the Rugby League World Cup knockout stage.

Australia completed a dominant run through the tournament's first phase with a 50-0 thrashing of Ireland in Limerick on Saturday.

The tournament favourites scored nine tries and didn't concede any for the second straight game as they sealed top spot in Group A and set up a quarter-final clash with surprise packet the United States next week.

After chopping and changing his team in recent weeks, Sheens confirmed he will field his strongest side against the Tomahawks in Wrexham, Wales.

But the veteran mentor will agonise over just what the best 17 is in the coming days after a host of fringe players made the most of the squad rotation.

"I didn't get any injuries so I've got to come close to picking probably our best 17 on the next game," Sheens said.

"It's a real headache for me because we've got so many guys playing well.

"I've got a couple of contentious positions in particular but we'll work on that during the week."

Arguably Sheens' biggest call is whether to include rising half Daly Cherry-Evans as a bench utility player at the expense of Robbie Farah.

Cherry-Evans, deputising for the rested five-eighth Johnathan Thurston was named man of the match against Ireland, following on from his excellent performance against Fiji.

Right centre is another contentious position, with Brent Tate and Josh Morris both impressive against Ireland, as were Boyd Cordner and Nate Myles in a battle for a bench spot.

Sheens admitted his decision to rotate players in key positions robbed his side of some rhythm and it showed as Australia lacked fluidity at times at Thomond Park.

I blame myself a bit for that, Sheens said of some timing issues in attack.

.... All the halves have had a couple of runs, they're as cranky as hell about that as I know they're all competitive.

But at the end of the day we've achieved after the three pool games to lead our pool and we've played pretty well.

I think we can play better so I'm hoping we'll improve that.

Defence was again a highlight for Australia against Ireland while Cooper Cronk and Jarryd Hayne both scored doubles.

Cherry-Evans, Brett Morris, Billy Slater, Greg Bird and Andrew Fifita also crossed for tries.

Fifita was outstanding off the bench and looks to have secured a place in Sheens' best side while vice skipper Paul Gallen was outstanding up front.

Ireland, featuring a sprinkling of NRL players including Canberra prop Brett White, had conceded 74 points in their opening two matches and were never expected to trouble Australia.

Despite the gulf in class they tried hard until the end, much to the appreciation of a crowd of 5021 in the rugby union stronghold, a record attendance for rugby league in the country.

The match represented the halfway mark of an arduous six-week campaign for Sheens side' and he insisted such games were worthwhile.

It's a little harder than it looks I think you'll find if you ask (the players), Sheens said before the squad returned to their Manchester base on a charter flight.

There were no injuries and we achieved the things we set out to as a team.