Dortmund was a hit in front of Cologne this Saturday on behalf of the 25th day of the Bundesliga (6-1).
BvB made the difference with two doubles from Reus and Haller – who scored his second and third goals of the season in the German top flight – and goals from Guerreiro and Malen.
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A big victory that allows the Borussens to temporarily take control of the championship, with a head start on Bayern expected on Sunday on the lawn of Bayer Leverkusen.