He won't get many better half-centuries than that, against a world-class bowling attack. He's been very measured and composed.

This is an invaluable half-century - now he'll be looking to tee off.

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Rahmanullah Gurbaz brings up a superb half-century from 44 balls.

He gets there with a single. This has been such a good innings for Afghanistan from their exciting opener.

Beauty!

What a delivery from Ashton Agar. Fired in on middle and leg, it rips away to beat Rahmanullah Gurbaz.

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Afghanistan have really applied themselves on a difficult pitch.

It's going to be a tough chase this - there's a lot happening with that pitch.

Not a massive over but Afghanistan have done brilliantly in terms of keeping the scoreboard moving.

Three singles to end the over and the Australians are really ticking now.

It's easier to play like this in the first innings too, because there's no scoreboard pressure.

Cut up and over backward point by Ibrahim Zadran.

Four runs to bring up the 100 partnership. Superb batting.

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There is some real frustration within this Australia team now. Afghanistan are really building the pressure.

Ashton Agar needs a lot of extra fielding practice, he has given up four extra runs so far today.

Is the pressure starting to tell for Australia?!

After that missed stumping, he now have another error in the deep by Ashton Agar.

Ibrahim Zadran clubbed a full toss from Adam Zampa but should only get a single.

Instead, for the second time tonight, the bouncing ball goes through Agar's hands for four.

You can sense that Afghanistan are really trying to take on Adam Zampa in this over.

Rahmanullah Gurbaz goes again, dancing down the track but missing with an almighty swipe.

It was a googly by Adam Zampa to beat him but the batter gets another reprieve as the ball bounces out of Matthew Wade's gloves.

The faintest of inside edges saves Rahmanullah Gurbaz.

Without it, he looked to be in big trouble.

That might be out, unless there is an inside edge.

Is it six and out for Rahmanullah Gurbaz?

He's pinned on the front pad by Adam Zampa and it looks close...

Brilliant from Rahmanullah Gurbaz!

Tossed up by Adam Zampa and Gurbaz hammers it back over his head for six!

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You can see Australia panicking, it is not often you see that. You can hear from shouting at each other.

Marcus Stoinis ends with two dot balls after more excellent running between the wickets from the Afghanistan openers.

This pitch might not be the easiest to bat on - although it has got easier the longer the batters have been in - so the value of good running is even greater.