Bayern break record, Dortmund lose derby
Both Bayern and Mainz had held the record of seven consecutive wins in previous seasons, but the Bavarians went one better in Dusseldorf.
It was also the 300th Bundesliga victory for Bayern coach Jupp Heynckes thanks to goals by Mario Mandzukic, Luiz Gustavo and Rafina, plus two from Thomas Muller. Despite second-placed Eintracht Frankfurt and Schalke, third, also winning, Bayern remain five points clear at the top.
Bayern went ahead on 28 minutes after Franck Ribery's pass split the defence and found striker Mandzukic unmarked on 28 minutes to slot home. Enjoying 80 per cent possession, Bayern doubled their lead on 36 minutes.
Muller fired the ball into the box and Brazil midfielder Gustavo enjoyed a simple tap-in with Dusseldorf goalkeeper Fabian Giefer at his feet, desperately trying to scramble away the danger.
Muller grabbed Bayern's third on 55 minutes after a good pass from Ribery. In the closing moments Fortuna's defence folded, as Muller grabbed his second on 86 minutes and Rafinha claimed the fifth a minute later. "Of course, I am delighted," said Heynckes. "We played fantastic football from start to finish."
Dortmund denied in derby
Schalke enjoyed a rare 2-1 win at title-holding neighbours Borussia Dortmund in the 141st Ruhr derby. The Royal Blues took an early lead when Dutch forward Ibrahim Afellay volleyed home on 14 minutes at Signal Iduna Park stadium in front of 80,645 fans.
The 23-year-old sprinted clear of the Dortmund defence and drilled the ball past Borussia's despairing goalkeeper Roman Weidenfeller.
Having started with a 4-4-2 formation, Borussia then switched back to a 4-2-3-1 attack which paid off when Poland striker Robert Lewandowski headed home on 55 minutes to put the hosts back in the game, but it was not enough.
Defeat leaves defending champions Dortmund 12 points behind leaders Bayern and four points behind Schalke in the league.
"We were a bit surprised that Dortmund changed their formation, but we coped well with it," said Schalke coach Huub Stevens. "After it was 2-1 the whole team fought well and deserved the win."
"We didn't play well," admitted Dortmund coach Jurgen Klopp. "After the system change, we were less stable early on. We played too little football and all in all, Schalke deserved the win."
Another win for Eintracht
Eintracht enjoyed their sixth win in eight games with a 3-1 win at home to Hannover, having scored two goals after only 18 minutes through Algeria midfielder Karim Matmour and defender Sebastian Jung.
Hannover pulled a goal back through Mohammed Abdellaoue on 43 minutes, but Eintracht netted their third on 82 minutes thanks to a header from Alexander Meier.
Freiburg enjoyed a 2-0 win at Wolfsburg, while Bayer Leverkusen drew 2-2 at home to Mainz.