Harry Kane took just nine minutes to grab his first Der Klassiker goal as he doubled Bayern Munich's early lead.
The England international has been nothing short of sensational since joining from Tottenham in the summer.
And the Bundesliga's top scorer wasted no time in scoring against Bayern's arch-rivals as he tapped home from close range.
A swift counter-attack saw Leroy Sane played in down the left flank, who then found the run of Kane inside the box.
And all that was left for Kane to do was slot into an open goal with Bayern threatening to run riot at Signal Iduna Park.
It is Kane's 13th German top-flight goal of the season in just his tenth outing.
Bayern broke the deadlock in the fourth minute away at Dortmund, with defender Dayot Upamecano heading home Sane's corner.
Thomas Tuchel's side know anything less that a win is good enough following Bayer Leverkusen's win against Hoffenheim earlier on Saturday.
And the Bavarian outfit have a point to prove after they were dumped out of the German Cup to third-tier side Saarbrucken on Wednesday.
Speaking ahead of the first Der Klassiker of the campaign, Dortmund boss Edin Terzic claimed he was confident his side could keep Kane quiet.
He said: «We know his teammates will be looking for him so often.
»He keeps dropping into the No10 and No8 positions, and we as a team want to counter that by narrowing the gaps.
«We always want to create a two-vs-one situation defensively. We know about Harry Kane’s qualities.
»It’s an exciting task. We are very confident that we will do well tomorrow."
But with Kane scoring unmarked inside the box, it's safe to say the Dortmund game plan hasn't worked so far.
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