There was nothing wrong with the former Tottenham man, and now back come Dortmund on the attack. Reus, on the edge of the area, side-steps Mancienne and gets a shot away. Unfortunately though, it's blocked by Westermann.

Arslan gets robbed by Reus in the middle of the park, but luckily for him, the referee blows after seeing van der Vaart down holding his face.

It really is end-to-end stuff here. Diekmeier that time, put in a deep cross from the right towards Ilicevic. The Croatia got his header away from the edge of the area, but could only put it over the bar.

OH! Another chance for Dortmund! Reus, on the right-hand side of the area, just had to shoot across goal, but instead looked for the cut back and Lewandowski, which Mancienne latched on to and cleared.

The corner's taken by Gotze. It goes out to Perisic on the edge of the area, who powers a shot at goal, that goes just wide of the left-hand post.

OHHH! Great save! The free kick was whipped in by Reus, and Mancienne could only watch as his header looped towards goal, only for Adler to tip over.

Arslan pushes Gotze in the back, just over the halfway line, and concedes a free kick.

Hamburg have started excellently here. That time, Badejl flicked the ball to Diekmeier, who charged down the right, and put in a nice ball for Rudnevs. The Latvia forward couldn't quite get his header on target, but Dortmund are looking terribly vulnerable at the back.

Piszczek, with the ball on the right-hand side, was charged down immediately by Ilisevic. The Croatia forward though, went in too swiftly, and gave away a free kick.

Nice play from Arslan there. The Turkey midfielder skipped past Gotze, and then tried to slip Rudnevs through on goal. Hummel though, read the pass, and intercepted well.

Wow. What a start. The Dortmund defence were just caught napping there, and the South Korean international made them pay. Is this going to be the end of BVB's 31-game unbeaten run?

Assist Rafael van der Vaart

Goal Heung-Min Son
GOOOAAALLLL! And Hamburg have gone 1-0 up already. A brilliant cross from Rafael van der Vaart on the left-hand side, went to the head of Son Heung-Min, who headed from eight yards past Weidenfeller. Amazing scenes.

The ball is played back to Adler in goal, who immediately lumps it upfield to Rudnevs. The Latvian striker loses the header though, to Subotic, who heads it back to his goalkeeper Weidenfeller.

Here we go then. We're finally underway here at Imtech Arena, and it's Hamburg who kick us off going from left-to-right.

Just under 15 minutes to go until kick off, and despite reports that 1,000 Borussia Dortmund fans will leave the ground at kick off in protest at high ticket prices, the atmosphere is electric.

As always, I want to hear your views on this afternoon's match. Hit me with your questions, predictions, abuse @alexjmott on Twitter.

Dortmund (4-2-3-1): Weidenfeller; Piszczek, Subotic, Hummels, Schmelzer; Leitner, Kehl; Reus, Gotze, Perisic; Lewandowski.

Hamburg (4-2-3-1): Adler; Diekmeier, Mancienne, Westermann, Jansen; Arslan, Badelj; Son, van der Vaart, Ilicevic; Rudnevs.

TEAM NEWS: van der Vaart starts for Hamburg, alongside Son Heung-Min and Ilicevic in a three-pronged attack, whilst Dortmund go with Reus, Gotze, Perisic and Lewandowski. I can smell the goals already.

Even with Van der Vaart's record against Die Borussen, there's not an awful lot to be cheery about for Hamburg. They haven't won in seven attempts, and are in the midst of their worst start in 40 years.

Thorsten Fink's team though, have brought in Rafael van der Vaart from Tottenham this summer, and the former Tottenham is expected to make his first appearance at Imtech Arena since he left the club for Real Madrid back in 2008. His personal record against BVB looks like something to cling on to for the hosts: in four games against Dortmund, he has won three times, and scored winning goals twice.

Jurgen Klopp's side are currently on a 31-game unbeaten run, and travel to Hamburg this afternoon, looking to continue that amazing form against a Rothosen team who are yet to win a game this season.

Good afternoon everyone, and welcome to Goal.com's LIVE, play-by-play, coverage of Hamburg SV vs Borussia Dortmund from Imtech Arena. I'm Alex Mott, and I'll be your commentator for this fascinating Bundesliga clash.