Werder Bremen, another team riddled by injuries, snapped a two-match league losing streak and moved up to fourth, a slot behind Bayern.
With 38,500 attending at Weserstadion, the defending champions riddled Nuremberg's defense with its combinations.
The best was produced in the 18th minute when Johan Micoud and Germany player Miroslav Klose beat the visitors with a passback that the Frenchman sidefooted in for the second goal.
Ivan Klasnic, Christian Schulz and Fabian Ernst rang up the other scores for Bremen.
US international Steve Cherundolo's first Bundesliga goal helped Hannover move to sixth in the table behind the club's third straight win.
Cherundolo's header in the 35th minute produced the second goal in the 2-0 victory. In the second half, the American was forced out of the match with a injury.
Alessandro Del Piero scored two goals within an eight-minute span and set up another by Mauro German Camoranesi to help powerhouse Juventus beat lowly Siena 3-0 and increase its lead in the Serie A.
The 29-year-old Italy forward, much criticized for a disappointing start mostly due to an inflamed tendon, scored the opening goal in the 52nd minute, added another in the 60th and kicked a curling free kick in the 63rd to Camoranesi, who headed home La Juve's third goal.
Juventus' sixth win in seven matches lifted the unbeaten Turin team to 19 points, six clear of defending champion AC Milan, which plays crosstown rival Inter Milan in a crucial Milanese "Derby" on Sunday.
Inter has 10 points going into today's seventh round of Italy's top league.
Ten-man Cagliari, inspired by former Chelsea star Gianfranco Zola, held Atalanta to a 2-2 draw, preventing the Bergamo team from clinching its first victory of the season.
At the same time, Cagliari missed a chance to win its first away from home.
Zola, who joined the Sardinian team last year after seven seasons in the Premier League, fed Mauro Esposito for a 13th-minute goal that evened a quick goal by Atalanta forward Giampaolo Pazzini.
A free kick by Zola in the 29th led to Cagliari's second goal by defender Simone Loria in a melee.
Riccardo Montolivo netted his first Serie A goal with a low shot in the 40th to lift the home team to 2-2.
Zola was replaced early in the second half to make room for a midfielder after Massimo Brambilla received his second yellow card in the 50th and was ejected, leaving Cagliari one player down.
Atalanta attacked throughout the second half and nearly scored in the closing minutes with Carmine Gautieri and Croat striker Igor Budan.
Gautieri failed to control the ball in the 81st, after beating Greece goalkeeper Fanis Katergiannakis.
A joint blunder by Katergiannakis and defender Alessandro Agostini helped Pazzini's opening goal after two minutes.
The draw gave Cagliari 10 points in the standings, in a sixth-place tie with Inter Milan. Atalanta (0-4-3) was left struggling in the bottom places with four points.
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