Thanks for joining me tonight. Report and reaction to follow.
Germany will meet Argentina in the World Cup final at the Maracana on Sunday night. On the Saturday, Brazil face Holland in the third-fourth place playoff.
Full-time in Sao Paulo: Holland 0 Argentina 0 AET. Argentina win 4-2 on penalties.
MAXI SCORES! He blasts it, Cillessen gets his hands to the ball but can't keep it out - and that wins the shootout 4-2 for Argentina.
Maxi Rodriguez to win it...
KUYT SCORES! He puts it low to Romero's left and in. Holland 2 Argentina 3.
Kuyt must score to keep Holland in the World Cup...
AGUERO SCORES! The Man City striker slides it home low. Holland 1 Argentina 3.
Aguero to put Argentina into a two-goal shootout lead...
PENALTY SAVED! Romero dives full stretch to his right to keep out Sneijder's effort. Holland 1 Argentina 2.
Sneijder now for the Dutch...
GARAY SCORES! He smashes the ball past Cillessen. Holland 1 Argentina 2.
Garay will try to keep Argentina's advantage...
ROBBEN SCORES! Low to Romero's left. Holland 1 Argentina 1.
MESSI SCORES! He coolly sends the ball to Cillessen's right, the Dutch keeper going the wrong way. Holland 0 Argentina 1.
Messi next, against Cillessen...
PENALTY SAVED! Romero goes left to keep out Vlaar's spot-kick. Holland 0 Argentina 0.
Holland will go first, with Vlaar up against Romero...
A quick glance at Sabella's clipboard shows the Argentina penalty order is Messi, Garay, Aguero, Maxi and Biglia. Cillessen has never saved a penalty in his professional career.
Full-time in extra-time: Holland 0 Argentina 0 AET. It's penalties for a place in the World Cup final against Germany at the Maracana on Sunday.
Rojo skips over a pass from Kuyt that was meant fro Wijnaldum.
One added minute to be played.
Janmaat crosses low from the right and Kuyt is able to get a shot away but it's deflected away from goal.
Mascherano, who has probably been Argentina's best player, tackles Robben on the left once more.
Messi scampers down the right past Vlaar and gets to the byline, and then crosses for Maxi Rodriguez to take a shot - but he sidefoots the ball into the turf and Cillessen can claim it.
Palacio is presented with as clear a chance as we've seen all night but he heads into the grateful hands of Cillessen after the ball was lifted over the Dutch defence by Maxi Rodriguez.
Holland are seeing a little more of the ball than Argentina but there's no urgency whatsoever from either side and penalties appear inevitable.
De Vrij tries a shot from long range but it bends wide of Romero's goal.
Zabaleta goes off the pitch to change his shirt. He's chewing on a big lump of cotton wool at the moment.
Zabaleta is still down and receiving treatment.
After Cillessen tricks Aguero, the robust Kuyt jumps in to win the ball ahead of Zabaleta - but lays out the Argentinian as his shoulder connected with his jaw.
Holland get the second period of extra-time underway.
Half-time in extra-time: Holland 0 Argentina 0.
Palacio curls a cross in from the right over the head of De Vrij and towards Aguero, but Janmaat puts the ball behind for a corner.
One added minute to be played in the first half of extra-time.
YELLOW CARD! Huntelaar is booked for bringing down Mascherano (105).
Robben is furious with the Turkish referee as he feels he deserved a free-kick.
So it's former Liverpool man Maxi - who played against the Dutch at World Cup 2006 - who comes on, but not for Messi.
Final change for Argentina - Maxi Rodriguez ON, Lavezzi OFF (101).
Vlaar, who has had an excellent game, steps across to prevent Biglia sliding a ball in from the right.
Romero gets down to gather in a powerful shot from Robben, who had stepped inside Biglia. Holland's first shot on target.
Could Sabella be considering taking off Messi? He's having less and less of an impact as the game goes on.
Sneijder crosses from the left but again, it's overhit.
Robben slips through a gap on the left side of the area and Mascherano has to put the ball behind for a corner. Sneijder sends in the set piece and it deflects off an Argentina player for a throw on the right.
Last change for Holland - Huntelaar ON, van Persie OFF. Robben takes the captain's armband (96).
Holland yet to get a shot on target from four attempts (three off target, one blocked). Argentina have got two of their six shots on target.
Looks like Huntelaar could be about to come on, so no Krul factor for a potential penalty shootout if so.
On email, Yinkore says "Holland will win on penalties" while Karal Adnan Bhatti writes "I think the deadlock will surely be broken in extra time and the Netherlands seem more likely to do it." Reece Barnes adds: "Might as well get Tim Krul ready, this is going to penalties! #KrulTime"
Extra-time is underway.
Sky Bet's odds are now 11/10 on Holland to qualify, and 4/6 on Argentina. Holland to win in extra-time is 4/1, and Argentina are 9/4 to triumph without the need for penalties.
End of normal time: Holland 0 Argentina 0. We're going to have 30 mins of extra-time. Email me at firstname.lastname@example.org or tweet me at @jonboy79 with any quick thoughts.
Janmaat is just offside on the right flank as Wijnaldum tries to slip him into space.
Zabaleta heads the set piece away and then Romero punches the cross in from the left away.
Sneijder's clever backheel lay-off puts Robben into the area as Demichelis is wrong-footed. But Mascherano's concentration and pace is superb and he is able to get in a crucial block. Corner.
Three minutes of added-on time.
Holland are still edging possession and they're keeping the ball well in these final stages.
Argentina get a glimpse of goal as Messi plays Aguero in on the right side of the box but Vlaar gets across to intercept.
Rojo stoops to nod the corner away and then Clasie sends a shot wide.
Demichelis concedes a corner after tackling the sprinting Robben on the left.
Aguero is penalised for knocking the ball out of Cillessen's hands after the goalkeeper had saved from Rojo.
Romero comfortably claims Robben's cross from the left.
First substitutions for Argentina - Palacio and Aguero ON, Enzo Perez and Higuain OFF.
Rojo comes across to clear just when it looks like the ball might run into Robben's path.
Blind wins a free-kick in the left channel. A chance for Sneijder to whip the ball in... but a hopeless delivery loops high and out. Awful.
For a moment, some of the crowd think they've seen a goal - but Higuain's effort is actually into the side netting after Perez's ball in from the right. Again, the offside flag was up anyway. Replays show it was a tight call.
Van Persie's flagged offside, rightly, as Janmaat crosses in. The delivery was behind the Manchester United striker in any case.
... and that's overhit and out of play. From Messi. Even the very best is struggling out there tonight.
Vlaar stumbles and then throws his body in front of Higuain to prevent a cross coming in from the right. Free-kick to Argentina on the touchline. Messi will take...
Lavezzi's shot is blocked after Rojo found him with a pass.
Janmaat is OK to continue. Only that half-chance for Higuian from Lavezzi's cross and the Sneijder free-kick over the bar as serious goal threats in this second half.
Garay heads away Kuyt's cross in from the left flank. Janmaat goes down after a clash of heads with Rojo, having sparked off the initial attack.
Clasie's introduction marks a noticeable step up in Holland's attacking intent, at least for a few minutes.
Biglia is clutching his arm but he gets to his feet and jogs off the pitch for further treatment. He's then waved back on.
Second change for Holland - Clasie ON, De Jong OFF (62).
Biglia and Janmaat slide in for the ball on the edge of the area, and the Argentinian comes off worse. He needs treatment and the stretcher is brought on too.
Zabaleta releases Lavezzi down the right, and the latter's ball in is directed for Higuain - but Janmaat does enough to prevent a clear attempt on goal.
An excellent tackle by Vlaar to take the ball away from Messi 20 yards out.
Good work by Biglia to win the ball back as Robben attacked Demichelis. That's beginning to look like an interesting contest, following the booking for the Argentinian.
Holland now lead on possession overall but that's about all there is to report in the early stages of this second half.
Sneijder's free-kick is high of Romero's goal.
YELLOW CARD! Demichelis pulls back Robben who had received a ball in from Kuyt on the left. First caution for Argentina (49).
Garay's lost his boot somehow and needs a moment to get it back on before play can resume.
De Vrij bodychecks Perez and Argentina get a free-kick on the left, which they play short.
Holland kick off the second half. Kuyt moves across to the left as a result of Janmaat's introduction.
Sabella is continuing his instructions to his Argentina players in the tunnel before they emerge for the second half. Underway again shortly.
First change for the Dutch - Janmaat ON, Martins Indi OFF.
As established earlier, the Dutch have rarely scored in the first half of games in this tournament. They're back out and making a change...
Half-time bet? Holland are now 5/2 to win within normal time with Sky Bet, while Argentina are 15/8 and the draw is 11/10.
On Twitter, we have Keith from Liverpool aka @krayze_keef: "looks like this game will come down to 1 moment of brilliance from either Messi or Robben." @bentheball says: "I think Messi will get a late goal and make it 1-0!"
Ben David writes: "Holland playing too slow, need to pick up the pace of the passing - but I'm confident they will still win." Michael J. from Montreal says: "Both teams have played cagey football for virtually the entire tournament. Not terribly attractive, although you can't fault the tidiness of the play. Credit to Cillessen for holding his own, a lesser keeper might have taken the whole Tim Krul saga to heart. Speaking of which, I wouldn't be surprised if this went to penalties."
Chris Green is back on the email: "I'm surprised to see the teams entering the dressing rooms on level terms as both keepers were tested quite frequently during the opening 45 minutes. Let's hope things liven up after the interval."
Some HT stats for you: Argentina lead possession by 52% to Holland's 48%. Messi's free-kick saved by Cillessen is the only shot on target thus far. Garay's header from a Lavezzi corner went over the bar, while Sneijder sent a potshot wide. That's your lot for attempts on goal so far. Argentina have had three corners to Holland's one. The Dutch have committed six fouls to the South Americans' four.
Half-time in Sao Paulo: Holland 0 Argentina 0. What did you make of the first 45 minutes? Argentina have been just about on top. Email me at email@example.com or tweet me at @jonboy79.
A cross in from the left from Rojo is overhit.
Cillessen manages to gather the high ball in from the free-kick at the second attempt. Two minutes of added-on time.
YELLOW CARD! Martins Indi is the first player booked (45). The Dutchman tried to drag back Messi on the right. The Turkish referee has had enough of his infringements.
Demichelis heads down Sneijder's free-kick out of the area. The ball comes all the way back to Cillessen and Holland try to build from the back once more.
Argentina maintain possession but after De Vrij dispossesses Perez, it's Holland that win a free-kick.
The free-kick plan fails and Kuyt is able to rush in and clear. Sneijder is back on.
Martins Indi blocks off Messi on the right - free-kick to Argentina. Sneijder is still struggling after that bruising challenge from Demichelis. He hobbles off for treatment.
Vlaar slides in to clear Lavezzi's cross into the area from the right ahead of Higuain. Then Sneijder goes down in pain after a heavy tackle from Demichelis on the touchline.
Lavezzi is flagged offside on the Argentinian right after Messi tried to play him into space.
Romero punches the ball clear. As Sneijder's cross comes back in from the left and is headed down by De Vrij, the offside flag is raised against van Persie. TV replays suggest that was a bad decision from the linesman.
The Dutch win their first corner as Demichelis nicks the ball away from Robben.
Mascherano is back on the pitch after insisting he's fine to continue. De Vrij and Cillessen have a momentary mix up, but no damage done.
Mascherano falls to the turf after a clash of heads with Martins Indi. He gets some treatment on the pitch before walking groggily to the touchline.
Cillessen evades Higuain - just - as he clears the ball downfield and van Persie is almost onto a ball in from De Jong, but the chance runs away from him.
Garay goes for a brave diving header and connects - but the ball goes over the bar and the Argentina defender receives a boot to the head by Vlaar on the way down.
Garay coolly knocks the ball away after van Persie pulled the ball back looking for Kuyt. Argentina break and Lavezzi plays a cross in from the right. Eventually Vlaar puts Perez's pass behind for a third Argentina corner, to be taken by Lavezzi.
Argentina win another corner, Lavezzi off Martins Indi. Van Persie heads the ball away.
De Jong clears the low corner.
Argentina win the first corner of the night. Zabaleta escapes down the right and De Vrij has to stretch to nick the ball away from Higuain.
Perez sends a pass down the right for Higuain but Cillessen gets to the ball first. Slick surface has plenty of zip.
Messi's free-kick is hit with pace and flies through the wall but is held safely by Cillessen, who kept his eye on the ball.
Perez is clipped by Vlaar 22 yards out after a clever pass from Higuain. Messi will take the free-kick...
First serious attempt on goal as Sneijder tries a potshot from 25 yards out. The effort bounces and then goes wide of the left-hand post.
Argentina win a free-kick wide on the left as De Vrij muscles Lavezzi off the ball. Lavezzi's set piece is headed away by van Persie
Kuyt and Vlaar team up to dispossess Messi on the edge of the box after Argentina attacked down the right once more.
A spell of patient possession from Holland, who are glad to see the ball for a short while at least.
Zabaleta tackles Robben just outside the Argentina penalty box. The offside flag then goes up against the same Dutch player after a long pass from the right flank.
Perez can't work the ball out from under his feet on the edge of the area after good work by Higuain on the right.
Argentina enjoying almost all the possession in the first three minutes. Happy to pass the ball around the defence.
De Vrij and De Jong are both involved as Holland thwart an Argentina attack through the middle.
The crowd are in good voice early on here. De Vrij halts Lavezzi on the Argentinian left flank.
And we're off...
Argentina are yet to trail for a single minute of the 2014 World Cup. How will they react if Holland score first?
After the anthems, a minute's silence will be held in memory of the great Alfredo Di Stefano, who passed away on Monday at the age of 88. Argentina are wearing black armbands out of respect for the forward, who was born in Buenos Aires and won six caps for the national team before later representing Spain.
The teams are emerging from the tunnel and we're almost ready to go in Sao Paulo. Both sides are in their traditional kits - blue and white stripes and black shorts and socks for Argentina; orange shirts and socks for the Dutch, with white shorts.
It's been a rainy day in Sao Paulo and the temperature is about 18 degrees Celsius for tonight's game.
Chris Green on email: "The Argentina defence have been vulnerable on several occasions throughout this tournament, so they will need to tighten up this evening if they are to give themselves a chance of participating in a World Cup final for the first time since 1990. Prediction: Netherlands 1-3 Argentina, with Messi (2) and Higuain scoring the goals."
The last World Cup meeting between these two was at the 2006 tournament in Germany, but you'd be forgiven for forgetting it. It was a dreary 0-0 in Frankfurt to close out Group C after both teams had already qualified for the knockout stages. Sneijder, van Persie and Kuyt are survivors of that game for the Dutch; Mascherano and Messi for Argentina, although Maxi Rodriguez - a starter then - is a sub tonight.
We know Merson is backing Argentina, but what about Jamie Redknapp? Well, he's of a similar mind judging by his Sky Bet tips. Redders advises backing both teams to score in 90 mins at 10/11; Messi to net the first goal at 4/1; and Argentina to win 2-1 without the need for extra-time at 9/1.
Here's a tweet from Faisal Ahmed aka @fuzzyy99: "Such a hard game to call! But going for a 2-1 win to Holland, Robben and Messi scoring and RvP scoring a screamer in extra-time!"
Argentina's Lionel Messi is the man with the most completed dribbles in this tournament - 29 thus far. Messi has also created the most goalscoring chances in this World Cup: 19. Second on that completed dribbles list is Holland's Arjen Robben, tied on 25 with the injured Angel Di Maria.
Having Nigel De Jong back is surely a big boost to a Netherlands team that has looked over-protective of its defence since he limped off against Mexico in the last-16. It's a remarkable recovery from a groin injury that was set to rule him out of the rest of the tournament. No doubt he'll be watched closely by both coaches in the early stages to ascertain if he really is fully fit...
Jim McMillan on email expects a mismatch when Argentina go on the attack in Sao Paulo. He writes: "Ron Vlaar does a better job for Holland than he does for Villa but he is going to have a torrid time tonight against Messi. Hope he manages to get his shirt at the end!"
Fancy a Sky Bet Price Boost? Wesley Sneijder has been pushed out to 12/1 for the first goal, while Ezequiel Lavezzi is a 9/1 shot to notch the opener. Merson's prediction of 2-0 to Argentina is 12/1; the same scoreline in Holland's favour is 16/1.
Chris Ellams emails in to say: "I think this will be a tight game, I feel both sides are not great and will have their work cut out to beat Germany in the final. I'm almost certain both teams will score as I think both defences are a liability. 2-1 Argentina for me."
Holland's last four goals in this tournament have come after the 75th minute, and 10 of their 12 overall in Brazil have come after half-time. Can they make a faster start against Argentina tonight?
The referee at the 66,200-capacity Arena Corinthians tonight is Cuneyt Cakir from Turkey. The 37-year-old insurance agent took charge of the goalless draw between Brazil and Mexico and the 1-1 draw that saw Algeria eliminate Russia earlier in the tournament. He's better known to English fans as the ref who sent off Nani in Manchester United's 2-1 Champions League home defeat by Real Madrid at Old Trafford last March.
The bookies like the look of Argentina, with Sky Bet making them 6/4 favourites to win in 90 minutes. Holland are 21/10 and the draw is 11/5.
Hard one to call tonight. Jordan Green on email says: "If Messi's good, then Argentina will win. It'll be a close game. I'll go for 2-1 to Argentina." But Callum Giffen says: "I'm going for Holland tonight. I'm surprised by Argentina getting the favourites' tag. I feel they have not played anyone good yet and van Persie and Robben and co will be too much for this Argentinian defence. Maybe 3-2 Holland."
Argentina beat Holland 3-1 after extra-time in the 1978 World Cup final in Buenos Aires. That's their only win against the Netherlands in eight meetings overall (three draws, four defeats).
Our very own Paul Merson fancies Argentina to come out on top in this one, by a 2-0 scoreline: "Holland aren't very good at all and they can't keep getting away with it. They rely so much on Arjen Robben, it's unreal. Angel Di Maria will be a massive miss for Argenting but Gonzalo Higuain will be a totally different player to the one that started this tournament after scoring that unbelievable goal against Belgium and the game changer Messi will get them through."
So you've seen the two starting line-ups. Let me know your thoughts and your predictions too. Email me at firstname.lastname@example.org or tweet me at @jonboy79 and I'll use the best of your contributions throughout the night.
Argentina coach Alejandro Sabella makes two changes to the team that began the 1-0 win over Belgium in the last-eight encounter in Brasilia four days ago. Left-back Marcos Rojo returns from suspension and Enzo Perez starts in midfield. Angel Di Maria is out with a thigh injury and Jose Maria Basanta drops back to the bench, where Sergio Aguero will also begin the game.
Argentina team (4-3-1-2): Romero; Zabaleta, Demichelis, Garay, Rojo; Biglia, Mascherano, Enzo Perez; Messi (c); Higuain, Lavezzi.
Robin van Persie starts despite suffering a stomach bug in recent days, and Jasper Cillessen is preferred to Tim Krul in goal even though the latter was the penalty shootout hero when brought on in Salvador on Saturday.
So the big news there is that Holland coach Louis van Gaal makes just one change to the team that began the quarter-final against Costa Rica. Nigel de Jong has shaken off his groin injury and replaces Memphis Depay in the starting line-up.
Netherlands team (3-5-2): Cillessen; Vlaar, De Vrij, Martins Indi; Kuyt, Wijnaldum, Sneijder, De Jong, Blind; Robben, van Persie (c).
The team news is arriving as we head towards the 9pm kick-off (UK time)...
Welcome along to our live coverage of the second World Cup semi-final between the Netherlands and Argentina in Sao Paulo. The winners face Germany in the final on Sunday, the losers will meet Brazil in the third/fourth place play-off the night before.