Argentina are just keeping the ball at the moment. They'll be happy to get to half-time with a lead after that first half.

Australia are yet to have a shot on target. Harry Souttar's blocked header is their closest thing to a chance.

Image source, Getty Images

Lionel Messi, 35, is the oldest Argentine to score a World Cup knockout goal - taking the 'record' off Roberto Ayala, who was 33 when he netted against Germany in the 2006 quarter-finals.

Pat Nevin
Former Scotland winger on BBC Radio 5 Live

Messi can do the square root of nothing for 20 minutes. It only takes a second to score a goal. And he just turned it on for two or three minutes and that's been enough.

Image source, Getty Images

Australia are the 129th different team Lionel Messi has scored against.

Danny Murphy
Former England midfielder on BBC One

Australia now have a mountain to climb.

Lionel Messi. One shot. One goal. Would you expect anything less?

Image source, Opta/ BBC

Danny Murphy
Former England midfielder on BBC One

They should be rarely grateful they've got him because the performance was lacklustre.

It took a moment of magic. It's just the pace of the pass and once he got in the position we know he can finish.

Pat Nevin
Former Scotland winger on BBC Radio 5 Live

Messi is doing his job. He's doing what is needed of him to push his team on. Let's be honest, nobody else in his team looked like they were going to do it.

Australia's Milos Degenek is harshly booked for catching Marcos Acuna in the air. He is the second Australian who would be suspended for the quarter-final.

Pat Nevin
Former Scotland winger on BBC Radio 5 Live

About three minutes ago, it's as if Messi had enough of this. His one-two from the side there, he passes the ball differently from any other player. It hadn't left his boot and you knew it was in.

The man is, let's just say it one more time, a genius.

It's incredible that he can curl, he can hit it hard, this time it goes through a player's legs. I'm not sure if he meant to do that but I would not put it past him.

Image source, Getty Images

This scoreline is unfortunate on Australia but that can happen when you come up against one of football's all-time greats.

Danny Murphy
Former England midfielder on BBC One

He's injected pace into the play, the first bit of life we've seen from him. Great pass and then a burst off the ball to get it back. Can he finish? Of course he can.

Setting the tone for his team, that's way he's the greatest.

He can turn the game in a second. Just magnificent.

Andy Cryer
BBC Sport in Qatar

Of course it was him!

Chants of Messi, Messi ring out around the stadium.

What a moment.

Lionel Messi's inswinging free-kick is headed away by that man Harry Souttar.

Pat Nevin
Former Scotland winger on BBC Radio 5 Live

Messi has pushed Behich and thrown a fist in his back. Behich will be delighted with that.

A bit of a flash point between Lionel Messi and Aziz Behich. Play restarts and Behich fouls Papu Gomez. It's woken the Argentina fans up a bit.

Pat Nevin
Former Scotland winger on BBC Radio 5 Live

0-0 is the correct score. If anything, Australia are shading it in the last five or 10 minutes. Argentina have been very disappointing.

Image source, Getty Images

Australia have been every bit as good as Argentina so far. If anything they're edging it.