They know how much this win means.
And they snatched all three points as Bayern's high defensive line was stretched again, Sancho robbing Franck Ribery to start a move that saw Axel Witsel send Alcacer through to chip Neuer.
A game with some incredible goals, you can relive Der Klassiker with a look at the main points of action in today's Dortmund vs Bayern clash - you'll not want to miss the wonderful second from Dortmund's Marco Reus!
Borussia Dortmund extended their lead at the top of the Bundesliga standings with a 3-2 victory over Bayern Munich on Saturday evening.
With only 11 games played of a 34-game season, there is plenty of football yet to be played in this season's Bundesliga.
However, after years of drifting after the heady days of Jurgen Klopp's spell in charge of the club, fans will no doubt be thrilled that the Dortmund vs Bayern clash is once again one that is well within Dortmund's range.
Bayern slowly started to take control and Lewandowski eventually made the pressure count on 26 minutes, crashing a bullet header from a cross by Serge Gnabry past Dortmund's stand-in keeper, Marwin Hitz. On 10 minutes, Reus burst into the Bayern penalty area but produced a tame effort that his Germany teammate Manuel Neuer saved comfortably.
The Bayern striker had a hat-trick goal ruled out for offside while the champions rode their luck at the other end, Kimmich brilliantly clearing a Reus shot off the line before substitute Paco Alcacer was halted by Jerome Boateng with the goal at his mercy. Sancho played a pass into the right side of the area for Reus, who touched the ball past the diving Neuer, the goalkeeper's momentum bringing the forward down.
But Reus made no mistake in the 67th minute when he superbly guided home Lukasz Piszczek's cross first time to make it 2-2.
Can Kovac make history and turn around Bayern's rotten form, or will Dortmund prove too strong for a side accustomed to winning the Bundesliga title every season?