Borussia Dortmund will take a lead to Stamford Bridge in the Champions League after beating Chelsea 1-0 on Wednesday.
Karim Adeyemi's strike just after an hour opened the scoring in Germany when the hosts broke from a Chelsea corner and the forward got the better of Enzo Fernandez before rounding Kepa Arrizabalaga.
While Dortmund enjoyed the majority of possession in the first half, Chelsea should have gone ahead twice when Joao Felix missed a great chance from the edge of the box, before the forward fired over from inside it.