An excellent 0-0. Top stuff so far.

It's been an excellent half, and Germany are ending it on top. They look in control for the first time now, keeping the ball and getting space away from the Algerian pressing.

The Desert Foxes calling out for the interval...

Former England winger Chris Waddle
BBC Radio 5 live in Porto Alegre

"Barring a couple of shots Germany have done nothing. The Algeria keeper did well to get up and save the rebound. But Gotze has got to take advantage of that spilling."

Image source, Getty Images

Ouch - that is a bad'un! Algeria defender Rafik Halliche gets his timing all wrong and slides through the back of Bastian Schweinsteiger, who is lucky not to pick up an injury.

It was a knee-twister, and Halliche is rightly added to referee Sandro Ricci's notebook.

What a save! What a game!

Toni Kroos picks up space for the first time all night, he has a five-yard circle of grass to work in and lashes in a dipping shot, Algeria goalkeeper Rais Mbolhi makes the save but can only steer it out, Mario Gotze is there first, it looks like goal time but Mbolhi brilliantly blocks the rebound.

Chris Gilbert:, external This is the World Cup of the football powerhouses underperforming, and the lower ranked teams pulling out amazing performances.

C/Brian:, external Am loving the Algerian underdogs, trying to bite at every opportunity.

Craig Paterson:, external 'Per Mertesacker' is German for 'tortoise in concrete moon boots'. Maybe.

And that is close! Aissa Mandi hammers in a low shot from 25 yards, it hits Jerome Boateng, wrongfoots German keeper Manuel Neuer totally but spins just past the post.

Germany have failed to score just four times in 40 against non-European opposition. Wow.

Gary Lineker
BBC Sport

"Never ever thought I'd say this, but Germany look tactically inept."

Algeria must tire in the second half, they are playing at a tremendous pace. And as the half comes to an end Germany have a good little spell, Mesut Ozil fires in a dipping shot from 25 yards which Rais Mbolhi just about pushes away.

Former England winger Chris Waddle
BBC Radio 5 live in Porto Alegre

"Algeria are playing some fast football - they are not hanging about. They are looking to break quickly with green shirts flying forward.

"They are a dangerous side but they do run out of steam in the second half. That happened against Belgium, who came back to dominate the last half-hour and ended up winning the game."

Guy Mowbray
BBC Match of the Day commentator

"There's been talk of Brazil being fortunate to reach the latter stages of the World Cup given their form, and Germany likewise really. This is their worst showing at this tournament so far.

"But there's something about Porto Alegre that Algeria like. Their 4-2 win over South Korea here was their biggest ever World Cup win. While arguably their best win was their 2-1 victory against West Germany at the 1982 World Cup."

That's excellent movement from Thomas Muller though, beating his marker to head wide from a fine right-wing cross.

Never write off the Germans.

I dread to think what the Dutch could do to this German side, who have no answer to any form of pace on the counter-attack at all. Algeria win the ball back on the edge of their own box after a good move from the Germans, and within five seconds they have won a free-kick 25 yards out after more haphazard defending from dream bugler Per Mertesacker.

However, Sofiane Feghouli curls it wastefully over the top. German coach Joachim Low will be pleased to get his lads in for half-time here. They're not at the races.

Image source, Epa

Per Mertesacker is a man of many strengths. But playing as the last man on the halfway line is not one of them. A dangerous game, and one that Algeria are more than happy to play...

Ubaidullah Budye:, external Sensational footwork, Algeria are defying the odds here. So positive when they pinch the ball back.

Ricky Lee Everett:, external Philipp Lahm might be a great player but he has looked out of his depth in central midfield at this World Cup. And four centre-backs? Why Germany, why?

Gwalch Mon:, external Algeria battering the Germans early on. Just a matter of time till the Germans score a fluke then!

Germany are basically playing rush keepers here! Per Mertesacker is caught under a high ball again and Islam Slimani would be in until Manuel Neuer tackles him, again a good 40 yards out of his goal.

He's been brilliant at that so far, but his margin for error is nil. One false move and he'll be off...

Former England winger Chris Waddle
BBC Radio 5 live in Porto Alegre

"There has been a lot more energy about Germany in the last five minutes. Germany have been pressing more and when they press they look more of a threat. They take the ball off Algeria higher up the pitch and can move forward with Algerian players committed forward."

Germany have just raised their tempo since that appearance on the touchline from coach Jogi Low, much better.

Toni Kroos and Philipp Lahm are pulling the strings in the middle but they've not caused anywhere near as much panic in the penalty area as Algeria have.

Image source, AP

Former England striker Michael Owen on Twitter:, external Been so impressed by Algeria this tournament. Look so dangerous going forward. Germany don't know what's hit them here.