Back under way. Who is going to strike first?

Jay: One reason I'm rooting for Dortmund is to watch Jurgen Klopp's reaction if Bayern lose to another one of his former teams.

Wale Ibraheem: Since that ill-timed announcement of Pep as Man City manager, both Beayern and City have been going down. C'mmon Dortmund!

It might be goalless but the latest edition of Der Klassiker is far from dull.

Lots of action, chances and entertainment. 

Dortmund need the win to really blow the title race open. Will they gamble and really go for the goal they need after the break?

Germany boss Joachim Low is watching. He'll be pretty pleased with what he has seen so far. This is a decent match between two fully committed sides who are not holding back.

Another chance for Bayern as Arjen Robben drills an efforts just wide of the post from the edge of the area.

Image source, AFP/GETTY

Marco Reus tries to beat Manuel Neuer from the half way line with an ultra, ultra ambitious attempt. He does not even come close.

Terrific header by Erik Durm to prevent what looked like a certain Bayern goal with Arturo Vidal waiting to connect with Thomas Muller's inswinging cross.

Sven Bender becomes the first Dortmund player to be booked for diving in on Robert Lewandowski as the Bayern player was threatening a powerful run. The crowd don't like it.

Bayern are edging it as far as possession is concerned - 51% to 49%. There's little to choose between Germany's top two teams. 

This is definitely one of the more entertaining goalless draws. Both teams are dangerous on the counter. Two of Germany's most successful teams are giving this a right good go.

Drama at both ends.

Pierre-Emerick Aubameyang zips a cross into the Bayern area and Marco Reus takes a tumble following Joshua Kimmich's challenge. No penalty.

Bayern go up the other end and Douglas Costa spring the off-side trap and is clean through. He only has the keeper to beat but Roman Bürki comes to Dortmund's rescue.

Big moment.

Image source, Reuters

First yellow card of the night goes to Xabi Alonso after a sliding challenge on Mkhitaryan. The crowd react with a torrent of abuse in Alonso's direction.

Image source, Reuters

There's a spring in Dortmund's step. Erik Durm is allowed to turn in the box and fire a shot into the side netting after Bayern's defence had been carved open by Henrikh Mkhitaryan pass.

Meanwhile, it's finished in Paris where the champions-elect have been held by Montpellier.

The title is in no doubt but Laurent Blanc's side are stuttering over the line.

They head to Chelsea next Wednesday night, looking to protect a 2-1 lead from the first leg of their Champions League last-16 tie.

Bayern are prioving dangerous each time they cross the half way line. Arturo Vidal throws himself at Douglas Costa's delicious cross. That was very close.

Image source, AP

Great pressing from Dortmund. They're not allowing Bayern any time or space on the ball. 

This is already developing into a very open contest.

End to end as Pierre-Emerick Aubameyang tests Manuel Neuer after a superb counter-attack moments after Douglas Costa had gone close for the men in red with a fierce drive.

One thing is clear already - Dortmund's keeper is not comfortable. Roman Burki has made two mistakes in the opening exchanges and his latest error almost lets in the dangerous Robert Lewandowski.