Clinton Morrison
Former Republic of Ireland striker on BBC Radio 5 Live

Both of these countries will be used to the heat, but I was watching the games yesterday, which all kicked off later, and by the 65-70th minute the players were looking tired. It can be a factor.

Tenacious tackling by Saud Abdulhamid as he pressures Papu Gomez by the corner flag. In the end he has to give away a corner and that prompts a huge roar from the Argentina fans.

Lionel Messi sends the ball in but the defence clears.

Clinton Morrison
Former Republic of Ireland striker on BBC Radio 5 Live

Saudi Arabia aren't going to make it easy and that is what the manager will have said to them. They are going to put their tackles in.

Image source, Getty Images

Abdulelah Al Malki and Lautaro Martinez both slide in for a 50-50. Al Malki gets a talking to from the referee for his part in that but it was just a coming together.

Andy Cryer
BBC Sport in Qatar

Two huge cheers.

One from the Argentine fans in expectation as Lionel Messi steadies himself 10 yards out from goal and then one from the Saudi fans as goalkeeper Mohammed Al Owais beats his effort away.

Clinton Morrison
Former Republic of Ireland striker on BBC Radio 5 Live

It is a great save. I was shouting goal.

He just didn't get enough bend on it, but that will give the goalkeeper confidence.

Mark Scott
BBC Radio 5 Live commentator

That is a brilliant save, it was a really well worked move by Argentina.

Just over a minute on the clock and Lionel Messi has a huge chance!

He should score really as Angel di Maria's cross from the right is closed down but the ball spills out to Messi, whose first-time shot is low but well saved by the goalkeeper. Great save.

Argentina have four players aged 34+ in their starting line up - the first team in World Cup history to do so. Will that experience be key?

Clinton Morrison
Former Republic of Ireland striker on BBC Radio 5 Live

Saudi Arabia won't want to go two or three down early because it could become a rout and and become six or seven.

Is this the start of Lionel Messi's journey to World Cup winner?

We're under way at the very loud and stunning Lusail Stadium.

Andy Cryer
BBC Sport in Qatar

Here we go then.

The teams are out and what a noise!

An incredible sound. Both anthems sung with real gusto.

Image source, BBC sport

Tim Vickery
BBC Sport South American football expert

My concern for Argentina, as we get into the business end, would be the defensive end. Their stats are excellent, it is something like two goals conceded in the last 15 games.

Aston Villa's Emi Martinez and Tottenham's Cristian Romero came into the side together last June and they've really improved the backline.

I wonder about Nicolas Otamendi at this stage of his career. I am sure he'll pick up a suspension at some stage and Lisandro Martínez of Manchester United will get to play at some stage.

The players are out on the pitch. Time for the national anthems with Argentina up first.

Ashley Williams
Former Wales captain on BBC Radio 5 Live

I don't think there will be a sports scientist in the Argentina camp who can tell Lionel Messi about what to do. He'll know what his body needs.

It is a special game for him, a special World Cup for him and he'll feel he can lift with the team he's got around him.

Tim Vickery
BBC Sport South American football expert on BBC Radio 5 Live

Over the last four years, from the time that Messi started to fall out from Barcelona, Argentina has been his number one priority. I don't think it ever really had been before.

That goes back to legacy and winning the World Cup and I really do think this is their best chance.

Clinton Morrison
Former Republic of Ireland striker on BBC Radio 5 Live

I do think Argentina will go deep.

The manager hasn't put pressure on them, but there will be pressure on them.

With the squad they have, they can get to the final.