Ire 136-8published at 17 overs
The equation is 44 from 18 balls.
Pat Cummins will bowl the 18th over.
Australia win to leapfrog England in Group One table
Tucker's 71 off 48 damages Australia's net run-rate, which could benefit England
Ireland never recover from 25-5 - two wickets for Maxwell, Starc, Cummins & Zampa
Australia post 179-5 after Ireland won toss
Skipper Finch returns to form with 63 off 44
Tom Mallows and Callum Matthews
The equation is 44 from 18 balls.
Pat Cummins will bowl the 18th over.
Quentin Hull
Commentator on BBC Test Match Special
Lorcan Tucker is tucking in at the Gabba.
This is tremendous. He is putting on a fine show tonight to continue building his profile and confidence.
Ravi Bopara
Former England all-rounder on BBC Test Match Special
He's on fire and he's playing some serious shots.
This is a time where I worry for Australia. The only time I do is at the death.
This is just outstanding from Lorcan Tucker. He has almost nonchalantly lofted Mitchel Starc away over long-off for a one-bounce four.
For the first time this innings the Australia players are starting to look a little concerned.
Ravi Bopara
Former England all-rounder on BBC Test Match Special
Every run that Ireland get here is damaging to Australia.
Quentin Hull
Commentator on BBC Test Match Special
Lorcan Tucker, he's still got something to prove tonight. I'm surprised you guys haven't started to cheer him yet - every run he gets helps England and New Zealand.
Four more! Lorcan Tucker has just ramped Mitchell Starc back over Matthew Wade's head.
The next ball he heaves over long-off for a one-bounce four!
Ireland couldn't, could they?
Love the optimism, Ravi.
Lorcan Tucker followed up that six with a four smashed through backward point.
He is 55 from 42 balls. It will take something spectacular from here. But as long as Tucker is there, you never know.
Ravi Bopara
Former England all-rounder on BBC Test Match Special
There is still a chance...
Quentin Hull
Commentator on BBC Test Match Special
That was a pure cricket shot. He just had a little bit of room to free the hands.
What a way to bring up his fifty. Well played, Lorcan Tucker.
He has hung around long enough! What a way to get to your 50 for Lorcan Tucker. He has hammered a slower ball from Josh Hazlewood straight back over his head for a huge six.
Barry McCarthy is the new batter to join Lorcan Tucker, who plays a rather ugly heave into the on side for a single to move onto 44.
He will hope McCarthy can stick around long enough for him to get his half-century.
Ravi Bopara
Former England all-rounder on BBC Test Match Special
Australia have really made back that run-rate that they lost against New Zealand. They will be sitting quite pretty going into their final game against Afghanistan, who they will expect to turn over. They could get another big win in that game too.
Jonathan Agnew
BBC cricket correspondent on Test Match Special
Ireland don't really know whether to stick or twist at the moment.
But as far as Australia are concerned this is exactly the performance they wanted.
Hand b Zampa 6 (Ire 103-8)
Bowled around his legs.
Fionn Hand has stepped right across his stumps to try and sweep the ball into that square-leg region but the ball squirms through and smacks into the stumps.
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That's a lovely shot from Fionn Hand. The field is spread but hand has managed to perfectly guide the ball through a gap at point for four to bring up the Ireland 100.
Marcus Stoinis made an instant impact. Taking a wicket with his second delivery.
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Fionn Hand is the new batter and immediately gets off the mark driving a full toss down to long-off.
It is boundaries Ireland need at the moment though. And lots of them.