Borussia Dortmund and Hamburger SV came face to face in an eagerly awaited clash on Saturday evening at Signal Iduna Park. With today's game Dortmund are set to play seven games in 22 days.

Borussia Dortmund had already made an excellent start this season, winning their opening four matches in the Bundesliga before Saturday's clash. Today's game gave them the chance to become one of only twelve Bundesliga sides in history to make it five from five at the start of a season.

Ahead of the weekend round of Bundesliga games, coach Jurgen Klopp still insisted that Guardiola's Bayern Munich were hot favorites for the title this season, but he is a notoriously shrewd man and has a habit of talking his young squad down at key points in the season.

Earlier in the day, second-half goals from Mario Mandzukic and Franck Ribery took Bayern Munich to the top of the Bundesliga as they saw off a spirited challenge from Hannover at the Allianz Arena.

But Dortmund were undeterred and trounced Hamburg 6-2 to return to number one spot by Saturday evening. And once again, Pierre-Emerick Aubameyang was the hero, opening the scoring on 19 minutes. Dortmund added a second through Henrikh Mkhitaryan before being pegged back to 2-2 by the 49th minute by the visitors. But 24-year-old Aubameyang who signed from French outfit AS Saint Etienne in the summer put Dortmund ahead with a powerful strike midway through the second half. A flurry of goals late on sealed the win, with a brace from Robert Lewandowski and one from Marco Reus.

Bayern, if they didn't already realize, have a serious challenger for their domestic crown. Although the league is only 5 games old, this championship could go write to the wire. Klopp's men will now focus on their Champions League assault and their impending tie against Napoli on Wednesday.

New-signing Pierre-Emerick Aubameyang hit a hat-trick as Champions League finalists Borussia Dortmund kicked off their Bundesliga season with an emphatic 4-0 win at Augsburg on Saturday.

With defending champions Bayern Munich, under new coach Pep Guardiola, having already enjoyed a 3-1 win at home to Borussia Moenchengladbach on Friday, 24-year-old Gabon forward Aubameyang showed why Dortmund paid French Cup winners St Etienne $17.3 million for him.

He opened his account by heading home a Marcel Schmelzer cross from the left wing to put Dortmund ahead after 24 minutes. Aubameyang celebrated with his trademark forward somersault, then doubled Dortmund's advantage when he slipped his marker and fired home across the goal on 66 minutes. The Gabon star then converted a great pass from Robert Lewandowski on 79 minutes to wrap up his hat-trick before the Poland striker converted a penalty in the dying stages.

The 2012/13 Champions League will be remembered as the year that German clubs came to the fore. Bayern Munich became champions of Europe again and with Pep Guardiola at the helm for the coming seasons, “FC Hollywood” should be a serious force in Europe for the foreseeable future. But what of last year's runners-up? 

Borussia Dortmund, under the guidance of Jürgen Klopp, excited the continent with their youthful enthusiasm and abundant energy. It was widely expected that three of the most vital cogs of Dortmund’s machine would have departed the Westfalenstadion by mid-summer. Herr Klopp was to be snapped up by a rich English or Spanish club, star striker Robert Lewandowski would have his choice between Madrid, Manchester or Munich and key midfielder Mario Gotze was heading for Munich after agreeing the move in late April. But aside from Munich seducing Gotze, which they had already done by the time both sides met at Wembley in the Champions League final, nothing has changed for the Bundesliga runners-up. Remarkably, and despite most predictions, the coaching and young playing staff has remained intact.