Three straight away for Jonny Bairstow as he cracks a wide ball through the off side. Steve Smith had set a field for the exact opposite of that. Ooft! Bairstow just about avoids chopping on! He pushed forward, rather loosely, and the ball hit the outside edge of the bat and just rolled wide of the stumps. Marsh looks agonised while Bairstow strides off to short leg for a firm word with himself.

Mitch Marsh is on! That'll give the seamers chance to rest up before the new ball is available.

Nathan Lyon will continue after drinks, and Dawid Malan gets those twinkle toes going to come down the pitch and force a single into the covers. That brings up the 100 partnership, and these two celebrate with a delightfully formal handshake in the middle of the pitch. Shot! That's a fine thump from Malan, lacing the ball through the covers to pick up yet another boundary.

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There's 10 overs before the second new ball is available, and 20 overs left in the day. Malan and Bairstow have played this nicely so far.

Ed Smith
Ex-England batsman on BBC Test Match Special

I just feel that everything about today has been Test cricket at its best. It's been ideal conditions and a different type of experience.

I think it's been terrific.

Four! That's nice from Dawid Malan, cutting the ball past gully for another boundary. Usman Khawaja dived for the ball but it was rather despairing. Malan frees his arms on a wider delivery but he can't quite time it and Nathan Lyon does a textbook long barrier to keep England to a single. Mitch Marsh, meanwhile, is swishing his arms around purposefully. He's bowled just two overs today.

Time for some drinks.

Image source, Getty Images

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Go go go!

Shot! That's a nice way to get to your best Test score if you're Dawid Malan - trotting down the wicket and cracking the spinner back down the ground for four. I like the way Malan's played the spin today. He's used his feet to Lyon and it's made him look more fluent. Jonny Bairstow turns a single past short leg to keep things moving along.

Fresh from his stint as team umpire, Nathan Lyon is going to have a bowl.

Nick Elliott: Steve Smith is so concerned about reviews he's just asked deep point's opinion on an lbw.

Australia lose a review after that, while England still have both of theirs in the bag. While Australia were having their huddle during the review, Nathan Lyon stayed out on the boundary. He signaled to them that it wasn't out before the giant screen did. He'd be a good umpire. Cummins keeps going full and straight to Malan, and Malan whams his bat down on the ball. Maiden.

Pat Cummins is the bowler, it's jagging back in to Dawid Malan and hits him pretty high. It's the top of the pads.

Hit him outside the line, and it's too high.

Not out.

Dawid Malan is rattled on the pads - not out.

Reviewed!

Turns out heaven is indeed a place on earth. Belinda was right...

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Stephan Shemilt
BBC Sport in Perth

Every time play is stopped because there's movement behind the bowler's arm, a message comes on the big screen telling spectators not to move near the sightscreens. It's a bit late by then...

Tim Paine's been excellent behind the stumps today. Another bouncer comes flying through to him and he jumps like there's a trampoline under him to snaffle the ball. Jonny Bairstow remains watchful to Mitch Starc, getting forward and defending, and he's content to see out a maiden.

Plenty. England are currently rebuilding after a top-order wobble, with Dawid Malan unbeaten on 64 and Jonny Bairstow 33.

They came together with England 131-4 following Mark Stoneman's controversial dismissal for 56 - caught behind off glove when TV umpire Aleem Dar overturned the on-field not-out decision. Video evidence at the time was far from conclusive.

Earlier, Alastair Cook failed (again), James Vince edged behind (again) and Joe Root was caught down the leg side.

Mitchell Starc has two wickets, but Josh Hazlewood has been Australia's best - and most aggressive - bowler on a pitch that is comfortably the quickest of the series.

Image source, Getty Images

Pat Cummins is back, in lieu of Josh Hazlewood. He goes short to Dawid Malan and Malan swivels, pulling the ball down and bagging himself an easy two.

Ooft! Cummins then cuts Malan in half with a delivery that nips back in to the batsman. There's a noise, but it's ball brushing pad. That's a belter from Cummins, very similar to the ball that dismissed Malan in Adelaide. Malan half-considers a flap at a short ball but changes his mind at teh last minute.