Deep Dasgupta
Former India wicketkeeper on Test Match Special

Very good catch from Shubman Gill. Green still seemed to be in T20 mode and I guess that is the reason for his downfall.

Another wicket for India here and if they can keep Australia in the 450 zone they will be happy with it.

Travis Head hit 163 off 174 balls, with 25 fours and one six.

Image source, BBC Sport/CricViz

Mohammed Siraj's face is a picture as he gets one to rise up at Steve Smith, but the Aussie batter manages to guide the ball fine down to third man for four.

Smith, so good at working the ball all around the square, then managed to pierce the gap square in the on side the next delivery.

Siraj looks exasperated.

Here is the first wicket of the day to fall, as Travis Head finally succumbed to the short ball.

Deep Dasgupta
Former India wicketkeeper on Test Match Special

I had chat with Steve Smith before play and said "good toss to lose, was it?" He said no. He didn't think the India bowlers attacked the stumps enough.

Steve Smith gets in a bit of a tangle as he shuffles across his stumps (again) and attempts to play the ball into the on side, but very nearly plays a leading edge straight back to Mohammed Shami.

Shami gives him a glare. Smith smiles and nods in appreciation.

It's getting feisty out there.

This was how Travis Head reached his 150, a perfectly timed cut backward of square.

All-rounder Cameron Green, who has been waiting patiently to come in since just after lunch yesterday, opens the face and guides his first ball away for four.

A nudges two just wide of square leg follows before a fired-up Mohammed Siraj then bangs one in short, forcing Green to duck right down low.

There is suddenly a spring in the step of the India players. After a difficult two-and-a-bit sessions they finally have an opening.

Alex Hartley
Former England bowler on BBC Test Match Special

It was a strange shot from Head. Instead of pulling the ball hard he's tried to tickle the ball fine. He should have flat-batted a conventional pull shot.

Stephan Shemilt
BBC Sport chief cricket writer at The Oval

It seems a bit daft to say about a bloke who made 163, but Travis Head has been discomforted by the short ball. England will be watching. For the Tests Mark Wood can't play, you wonder if Josh Tongue's prospects have improved.

Travis Head and Steve Smith are meeting aggression with aggression as Head pulls Mohammed Siraj through a gap and over the square leg boundary, before Smith drives powerfully through the covers.

Travis Head is now 163 from 173 deliveries. I'm reliably informed by my esteemed colleague Matthew Henry that the fastest Aussie double ton is Adam Gilchrist from 212 balls.

Just saying.

Alex Hartley
Former England bowler on BBC Test Match Special

The short ball is a weakness in Head's game. You can see it there.

Eagle-eyed England coaches will have seen that.

Jonathan Agnew
BBC cricket correspondent on Test Match Special

That could have gone anywhere.

You have to feel a bit for Mohammed Siraj there as Travis Head twice gets away with a poor shots from short deliveries.

The first did not rise up as high as Head thought and ended up fending the ball off into the off side.

Two deliveries later Head plays a wild pull that top-edges into the Oval sky, but lands safe between a clutch on onrushing fielders.

Andy Zaltzman
Cricket statistician on Test Match Special

This is the fourth time out of six hundreds that Travis Head has gone on to score 150 or more.

This is how Steve Smith brought up his century. And just look at the determination on his face.

For the first time today Mohammed Siraj gets a bit of variable bounce as one keeps a bit low and Srikar Bharat does well to take on the bounce behind the stumps.

There has been little else to trouble the Australia batters so far though. It already feels like it could be a long day for India.