Borussia Dortmund completed a first league and cup double in their 103-year history after a 5-2 dismantling of a below-par Bayern Munich in the German Cup final in Berlin.

Polish striker Robert Lewandowski scored a hat-trick for Jürgen Klopp's side, who underlined their status as the premier side in German football with a fifth successive victory over a Bayern side that may have had Chelsea on their mind.

Bayern can retrieve some prestige by winning the biggest prize in European club football next weekend with victory in the Champions League final against Chelsea in Munich, but it's BVB who clearly rule the roost domestically.

Japanese star Shinji Kagawa opened the floodgates after only 3 minutes in what is likely to be his last game for the Westphalians - the midfielder has been strongly linked with a move to Premier League giants Manchester United, whose manager Sir Alex Ferguson was amongst the capacity crowd in Berlin last night, hoping to finalise a deal. Kagawa stroked Dortmund in front with their opening thrust from Jakub Blaszczykowski's cross. Bayern's Luiz Gustavo will rue his two sloppy misplaced passes in the build-up. This goal set the tone for the evening as a ruthless BVB side punished embarrassing mistakes by a naïve Bavarian defence.

Bayern regrouped well and levelled on 25 minutes from the penalty spot after Mario Gomez was felled by BVB goalkeeper Roman Weidenfeller. Arjen Robben, who missed a crucial spot-kick in the 'title decider', comfortably dispatched the equaliser low and to the keeper's left. Weidenfeller, clearly in some discomfort after suffering a rib injury, had to be replaced by the inexperienced Australian Mitchell Langerak on 35 minutes.
At this stage the game was back in the melting pot with Bayern slightly the better side but defensive immaturity came back to bite them. Jerome Boateng lunged at Blaszczykowski inside the area and ex-Bayern defender Mats Hummels just about beat Manuel Neuer from the penalty spot. Neuer got a hand to the well-struck spot-kick but could not keep it out and BVB were back in front. It was a lead they never looked like relinquishing.

BVB exposed a lacklustre Bayern on the counter attack during first-half stoppage time. Top scorer Lewandowski finished off a rapid break, nut-megging Neuer to send the BVB fans into ecstasy.

It got even better as Lewandowski sent Dortmund 4-1 up just before the hour mark. Kagawa was again involved in smart build-up play and the Polish striker blasted past a helpless Neuer to put the game to bed.
Bayern mustered a mere consolation after Frenchman Franck Ribery fired left-footed past Langerak on 75 minutes. But Lewandowski had the last word, nodding home to complete his hat-trick in the 81st minute after a schoolboy spillage from Neuer gifted Lukasz Piszczek the ball.

Bayern must quickly forget about this painful drubbing, but are now under pressure to get a result on home soil against English underdogs Chelsea if they are not to experience another trophy-less season.