A cross hit Keanu Baccus on the arm but the referee hasn't given anything. Neither has VAR as play is back under way. With the handball rule now, you just never know what's going to happen.

Argentina shout for a handball. VAR will be checking to see if there's anything in this.

Image source, Getty Images

Getting FA Cup first-round vibes from this pitch. I'd expected pristine pitches at this World Cup.

Argentina are just knocking the ball around at the back, trying to feel their way into this game.

Pat Nevin
Former Scotland winger on BBC Radio 5 Live

Australia have tried to start on the front foot. Maybe slightly surprising but it might pay off, you never know. I like the attitude.

Danny Murphy
Former England midfielder on BBC One

Australia are the underdogs here. I feel like Messi will crown his 1,000th appearance with something special.

Julian Alvarez's first touch is to shin the ball out of play. The Manchester City forward was preferred to Lautaro Martinez tonight.

Pat Nevin
Former Scotland winger on BBC Radio 5 Live

This place is mobbed with Argentinians, about 90% Argentina fans. This is the best atmosphere I've seen at a game, by a distance.

Lionel Messi has scored eight World Cup goals... but they have all been in group games. Can he get his first ever knockout goal tonight?

Will it be Argentina or Australia v the Netherlands on Friday? Let's find out.

Andy Cryer
BBC Sport in Qatar

Fair play to the Aussies.

They are all packed together behind one of the goals. Twenty rows deep and two blocks across, the rest of the ground is just blue and white.

But they sung their national anthem with real gusto, following a pretty deafening rendition by Argentina as well.

As well as being Lionel Messi's 1,000th game of football, tonight is the 100th time he has started a game as captain of Argentina.

Chris Bevan
BBC Sport at Ahmad Bin Ali Stadium, Qatar

Image source, BBC Sport

95% of this stadium just blasted out the Argentina national anthem at top volume. The other 5% were wearing yellow.

Australia midfielder Keanu Baccus becomes the first St Mirren player to start a World Cup game.

Mile Jedinak
Former Australia captain on BBC Radio 5 Live

They've come this far, they will have done their prep on Argentina. It's about delivering, going out there, going toe to toe with them, executing the game plan and doing it collectively.

There will be moments when you have to suffer a little bit but then when you have those crucial moments, it's about going to execute them as well.

Image source, Getty Images

Players out and it's national anthems time.

Australia reaching the last 16 was one of the greatest moments in their football history - the bunting was out in Brisbane and the confetti was out in Canberra. It was great to see.

The Aussies have done brilliantly and I don't want to patronise them, but them getting to this stage is like England winning the World Cup final.

Credit to their boss Graham Arnold for having them so well organised, but they are limited and I don't think they have got any hope of going further at this tournament.

I also don't think they will be partying much when Argentina have finished with them.

Sutton's prediction: 5-0

Read the rest of Sutton's last-16 predictions here.

Mark Schwarzer
Former Australia keeper on BBC One

Australia have some quality on the pitch but I think the team and the unity is the key. why can't it take us any further?

Based on data analysts Gracenote's forecast Argentina have a 76% chance of progressing to the quarter-finals. Australia have a 24% chance.

BBC Radio 5 Live

Former Socceroos captain Mile Jedinak speaking to BBC Radio 5 Live: "We've got another opportunity here with boys who are going to go out there and give it their all, we know that, and if they can shock the world today, it might just be that next step that pushes football forward in Australia."