Dortmund had opened their campaign in style last week but the defeat is a blow to their hopes of defending the title.
Bayern scored a late winner to beat Wolfsburg after losing at home to Borussia Moenchengladbach last weekend.
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The start of the 2017-18 Premier League season is just around the corner and is shaping up to be one of the most competitive yet.
As always it is the so called “big clubs” that have splashed the most cash in the transfer window so far this summer. Manchester United or City? Arsenal or Tottenham? Who are the winners and losers of the transfer window so far?