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Saudi Arabia would progress to the last 16 with a win
A Mexico win would see them through if Poland beat Argentina
If that games finishes in a draw or Argentina win, Mexico would need to win by at least four goals
Poland 0-1 Argentina
Now things are getting interesting. Poland are clearly going to hear about what is going on in the other game.
Mexico needed a swing of four goals to overtake Poland. Another Mexico or Argentina goal and Poland drop to third. How are the nerves?
Saudi Arabia 0-2 Mexico
Danny Gabbidon
Former Wales defender on BBC Two
This is an outrageous piece of technique from Luis Chavez, look how far out he is. Absolutely no chance for the keeper.
Those quickfire goals at the start of the second half have really changed the complexion of Group C.
That second goal for Mexico means they need just one more now to overtake Poland in second spot.
Argentina on course to face Australia in the last 16.
How big could Guillermo Ochoa's penalty save from Robert Lewandowski in the opening game prove?
Image source, BBC Sport
Luis Chavez (53 mins)
Hello.
Mexico need four goals. They have two.
And this is a stunner. Luis Chavez steps up to take this free-kick, about 30 yards, out and he gets a wonderful amount of whip onto it, curling it past the keeper.
That's his first international goal too!
Image source, Getty ImagesSaudi Arabia 0-1 Mexico
Saudi's Hassan Tambakti is booked for fouling Henry Martin.
Poland 0-1 Argentina
Phil McNulty
BBC Sport chief football writer at Stadium 974
Argentina have the lead they deserve and the adrenalin is pumping now. Tackles flying in. And you can just imagine the noise inside Stadium 974. Deafening.
Image source, Getty ImagesPoland 0-1 Argentina
Danny Murphy
Former England midfielder on BBC One
Listen to this crowd. As you watch Messi, it's poetry in motion. We're so used to seeing him get in those positions and finish it off but it just comes off his right foot. Best player we've ever seen.
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Sam: If there was any award for game with best atmosphere this game would be clear winner it’s electric inside stadium 947
Image source, Getty ImagesPoland 0-1 Argentina
Everything but the finish!
Lionel Messi taps back into his 2010 self with a charging, driving, brilliant run that takes him past a series of Poland players. His shot, though... well, let's call it a slice and leave it that.
Saudi Arabia 0-1 Mexico
No surprise Mexico's goal came from a corner - their main course of attacking all game has been crosses.
They've put in 16 to Saudi Arabia's two, and this graphic shows their main avenues of attack.
Image source, OptaSaudi Arabia 0-1 Mexico
Saudi Arabia know they have to score to have any hope now. Sultan Al Ghannam bundles a shot wide at the back post.
Mexico need a few more goals to go through.
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Tony: So what's the game plan now Poland?
Image source, Getty ImagesPoland 0-1 Argentina
That Mexico goal is good news for Poland. Saudi Arabia were the bigger threat.
Saudi Arabia 0-1 Mexico
Henry Martin sounds like the name of a guy that plays for Scunthorpe or something. Would be pronounced quite different mind.
Image source, Getty ImagesPoland 0-1 Argentina
Danny Murphy
Former England midfielder on BBC One
The Argentina supporters are amazing, just incredible.
Image source, Getty ImagesSaudi Arabia 0-1 Mexico
Shamoon Hafez
BBC Sport at Lusail Stadium
What a start to the second half for this group.
The Mexico fans have erupted after that Henry Martin goal from close range.
Saudis have been silence.
Well, this group has suddenly burst into life!
Saudi Arabia 0-1 Mexico
Danny Gabbidon
Former Wales defender on BBC Two
The pressure tells. Mexico started this second half ever so well. And it's just a ball into the near post. Martin is on the move and he's not going to miss from there.
That's the goal Mexico were looking for. First one of the tournament.
Poland 0-1 Argentina
Danny Murphy
Former England midfielder on BBC One
Great leap from Glik, super ball in from Zielinski. It was close and a really good header from Glik.
Poland 0-1 Argentina
That Argentina goal was coming - these were the average player positions in the first half. Poland in black, Argentina in purple.
Argentina were camped in the opposition half.
Image source, Opta