We saw an Argentina side that were pushing and pushing but Saudi Arabia were comfortable in the way they were defending.
At times we think football is predictable, and then things like that happens and you are reminded about why we love football.
As long as you are committed and take the opportunities you have, anything is possible.
Post update
FT: Argentina 1-2 Saudi Arabia
Graeme Souness
Former Scotland captain on ITV
That was a shadow of any Argentina team I have seen. They were a shadow today.
Post update
FT: Argentina 1-2 Saudi Arabia
Clinton Morrison
Former Republic of Ireland striker on BBC Radio 5 Live
Argentina were poor in the second half. I thought they had a few more gears to go through.
Saudi Arabia put their bodies on the line. They were brilliant. They have a threat up front.
Argentina's defence lack a lot of pace, that is a problem.
Post update
Mark Chapman
BBC Radio 5 Live presenter
That is seismic.
'World Cup started'
FT: Argentina 1-2 Saudi Arabia
Joe Cole
Ex-Chelsea and England midfielder on ITV
That winning goal will inspire a generation. This is the World Cup started for me. This is an unbelievable result.
Biggest upset?
Biggest World Cup upset of all time?
Thumbs up for yes, thumbs down for no.
Watch the moment Saudi Arabia took a shock lead
Post update
FT: Argentina 1-2 Saudi Arabia
Clinton Morrison
Former Republic of Ireland striker on BBC Radio 5 Live
What a game. It was the best game in the tournament so far. It is fantastic.
First half, Saudi Arabia were nowhere it. They were by far the better team in the second half.
Argentina could have played all night and I don't think they would have scored.
Saudi Arabia thoroughly deserve it.
Post update
FT: Argentina 1-2 Saudi Arabia
Andy Cryer
BBC Sport in Qatar
The Saudi Arabia fans lucky enough to be here to witness this will never forget the moment they beat Lionel Messi's Argentina.
One gets the feeling their celebrations will go on long into the night after a heroic second-half rearguard effort.
But what now for Argentina? Their fans seem completely stunned as they already start filing out in almost silence.
What a contrast to a couple of hours ago when the blue and white shirts were in party mode.
Incredible. One of the World Cup's biggest ever shocks.
Post update
FT: Argentina 1-2 Saudi Arabia
Wonderful, incredible scenes of celebration on the pitch. Saudi Arabia players are hugging, smiling, crying.
They run to the wall of green and celebrate with their fans.
What a moment.
Post update
FT: Argentina 1-2 Saudi Arabia
Mark Scott
BBC Radio 5 Live commentator
That is sensational! What a result!
Argentina cannot believe it.
It is a monumental result.
Post update
Argentina 1-2 Saudi Arabia
Just wow!
BreakingFULL-TIME - Argentina stunned by Saudi Arabia
Argentina 1-2 Saudi Arabia
All over!
A HUGE, incredible win for Saudi Arabia and one of the biggest upsets in World Cup football.
Argentina, one of the pre-tournament favourites are stunned.
What a performance, what a result.
Post update
Argentina 1-2 Saudi Arabia
Argentina are firing crosses in, Saudi Arabia are holding on. Still we play...
Post update
Argentina 1-2 Saudi Arabia
Mark Scott
BBC Radio 5 Live commentator
Argentina are on borrowed time.
Post update
Argentina 1-2 Saudi Arabia
We're into the 13th minute of added time...
Post update
Argentina 1-2 Saudi Arabia
Clinton Morrison
Former Republic of Ireland striker on BBC Radio 5 Live
This might end when the keeper kicks it.
Post update
Argentina 1-2 Saudi Arabia
Mark Scott
BBC Radio 5 Live commentator
That was a save for the cameras.
Post update
Argentina 1-2 Saudi Arabia
Argentina win another corner. Marcos Acuna sends the ball in, Saudi Arabia clear but the ball is played back into Julian Alvarez who looks certain to loop a header into the far corner but Mohammed Alowais makes another HUGE save!
Saudi Arabia are almost there!
Post update
Argentina 1-2 Saudi Arabia
Mark Scott
BBC Radio 5 Live commentator
That is great news that he is able to put his thumbs up and he's awake.
Live Reporting
Gary Rose
All times stated are UK
'A reminder of why we love football'
FT: Argentina 1-2 Saudi Arabia
Nedum Onuoha
Former Manchester City defender on BBC 5 Live
We saw an Argentina side that were pushing and pushing but Saudi Arabia were comfortable in the way they were defending.
At times we think football is predictable, and then things like that happens and you are reminded about why we love football.
As long as you are committed and take the opportunities you have, anything is possible.
Post update
FT: Argentina 1-2 Saudi Arabia
Graeme Souness
Former Scotland captain on ITV
That was a shadow of any Argentina team I have seen. They were a shadow today.
Post update
FT: Argentina 1-2 Saudi Arabia
Clinton Morrison
Former Republic of Ireland striker on BBC Radio 5 Live
Argentina were poor in the second half. I thought they had a few more gears to go through.
Saudi Arabia put their bodies on the line. They were brilliant. They have a threat up front.
Argentina's defence lack a lot of pace, that is a problem.
Post update
Mark Chapman
BBC Radio 5 Live presenter
That is seismic.
'World Cup started'
FT: Argentina 1-2 Saudi Arabia
Joe Cole
Ex-Chelsea and England midfielder on ITV
That winning goal will inspire a generation. This is the World Cup started for me. This is an unbelievable result.
Biggest upset?
Biggest World Cup upset of all time?
Thumbs up for yes, thumbs down for no.
Watch the moment Saudi Arabia took a shock lead
Post update
FT: Argentina 1-2 Saudi Arabia
Clinton Morrison
Former Republic of Ireland striker on BBC Radio 5 Live
What a game. It was the best game in the tournament so far. It is fantastic.
First half, Saudi Arabia were nowhere it. They were by far the better team in the second half.
Argentina could have played all night and I don't think they would have scored.
Saudi Arabia thoroughly deserve it.
Post update
FT: Argentina 1-2 Saudi Arabia
Andy Cryer
BBC Sport in Qatar
The Saudi Arabia fans lucky enough to be here to witness this will never forget the moment they beat Lionel Messi's Argentina.
One gets the feeling their celebrations will go on long into the night after a heroic second-half rearguard effort.
But what now for Argentina? Their fans seem completely stunned as they already start filing out in almost silence.
What a contrast to a couple of hours ago when the blue and white shirts were in party mode.
Incredible. One of the World Cup's biggest ever shocks.
Post update
FT: Argentina 1-2 Saudi Arabia
Wonderful, incredible scenes of celebration on the pitch. Saudi Arabia players are hugging, smiling, crying.
They run to the wall of green and celebrate with their fans.
What a moment.
Post update
FT: Argentina 1-2 Saudi Arabia
Mark Scott
BBC Radio 5 Live commentator
That is sensational! What a result!
Argentina cannot believe it.
It is a monumental result.
Post update
Argentina 1-2 Saudi Arabia
Just wow!
BreakingFULL-TIME - Argentina stunned by Saudi Arabia
Argentina 1-2 Saudi Arabia
All over!
A HUGE, incredible win for Saudi Arabia and one of the biggest upsets in World Cup football.
Argentina, one of the pre-tournament favourites are stunned.
What a performance, what a result.
Post update
Argentina 1-2 Saudi Arabia
Argentina are firing crosses in, Saudi Arabia are holding on. Still we play...
Post update
Argentina 1-2 Saudi Arabia
Mark Scott
BBC Radio 5 Live commentator
Argentina are on borrowed time.
Post update
Argentina 1-2 Saudi Arabia
We're into the 13th minute of added time...
Post update
Argentina 1-2 Saudi Arabia
Clinton Morrison
Former Republic of Ireland striker on BBC Radio 5 Live
This might end when the keeper kicks it.
Post update
Argentina 1-2 Saudi Arabia
Mark Scott
BBC Radio 5 Live commentator
That was a save for the cameras.
Post update
Argentina 1-2 Saudi Arabia
Argentina win another corner. Marcos Acuna sends the ball in, Saudi Arabia clear but the ball is played back into Julian Alvarez who looks certain to loop a header into the far corner but Mohammed Alowais makes another HUGE save!
Saudi Arabia are almost there!
Post update
Argentina 1-2 Saudi Arabia
Mark Scott
BBC Radio 5 Live commentator
That is great news that he is able to put his thumbs up and he's awake.