With the result, Bayern Munich opened up a two-point advantage atop the standings for now while Mainz remain on the 15th place.

Borussia Dortmund closed the gap to the top spot after sweeping newly promoted Union Berlin 5-0 off the pitch.

Union grabbed the better start into the clash but Marius Bluter missed a ball from very close range with just four minutes played.

From then on, the "BVB" immediately assumed control and pressed the visitors on the back foot. It was thus just a matter of time before the hosts opened the scoring, as Dortmund forced a turnover at the edge of the box before Jadon Sancho slotted home from tight angle in the 14th minute.

Dortmund gained momentum and needed only four more minutes to double their advantage as Julian Brandt found prolific new arrival Haaland, who tapped home from central position inside the box.

The hosts dominated the proceedings on the pitch but had to wait after the half time to extend their lead, as Rafal Gikiewicz felled Haaland inside the box. Marco Reus stepped up and made no mistake to triple the lead in the 68th minute.

The visitors resistance was broken moments later when Axel Witsel completed a fast break from close range into the roof of the net.

Haaland wasn't done with the scoring and became the first played in history to net seven goals in his first three Bundesliga outings.

With the 11st win of the season, Dortmund move on the third place meanwhile Union Berlin slipped to the 12th position in the table.

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