Robert Lewandowski netted twice in a 3-0 home win against Eintracht Frankfurt while second-placed RB Leipzig crashed to a 1-0 defeat at home to Wolfsburg and Borussia Dortmund lost 2-1 at Hertha Berlin.

Bayern have now hit 28 goals in their last six games, with Lewandowski claiming 10 of them, and the Bavarian giants are on course to collect a fifth straight German league title in Ancelotti's first season.

"It was a good day for us with good results in other stadiums.

"The first half was difficult and Frankfurt were better than us.

"In all honesty, they didn't deserve to be 2-0 down at the break.

"We were better after the break and got our control back.

"We have a good lead now (in the table), but we must stay focused, there are still a lot of games," said Ancelotti.

Despite Ancelotti's cautious approach and with ten games left, it will take a collapse for Bayern to be denied a fifth title in a row.

The German giants are also well-placed to complete a treble of Champions League, Bundesliga and German Cup titles.

It is nearly four months since Bayern's last defeat -- a 3-2 loss at Rostov in the Champions League on November 23.

Thomas Mueller admitted Bayern took a while to hit their stride after Tuesday's impressive 5-1 win over Arsenal put them in the quarter-finals of the Champions League.

"We certainly had a tough start today and in the first 30 minutes, the team didn't concentrate well. We made a lot of mistakes," admitted Mueller, who laid on Lewandowski's opening goal.

But Frankfurt were floored by a devastating burst from Bayern just before half-time at the Allianz Arena.

Lewandowski converted Mueller's pass on 38 minutes, then Douglas Costa added a second three minutes later to put Bayern 2-0 up at the break.

Poland hot-shot Lewandowski netted his 33rd goal this season -- his 21st in the league -- on 55 minutes by converting Arjen Robben's final pass.

Bayern's iron-grip on the Bundesliga tightened with help from their rivals.

In Leipzig, second-placed RB crashed to a 1-0 defeat at home to Wolfsburg as Germany's Mario Gomez scored the winner.

"We could have taken a big step forward, but it's not so easy at the top of the table," said RB coach Ralph Hasenhuettl.

"The expectation (on the team) is enormous, we made a lot of bad decisions on the pitch and didn't deserve any points."

Thomas Tuchel rotated after Wednesday's 4-0 win at home to Benfica as third-placed Dortmund suffered a Champions League hangover with a 2-1 defeat at Hertha Berlin which leaves them 16 points behind Bayern.

"The result if very annoying, but I found the performance okay," said Tuchel.

"We had the right mentality, attitude and will, but we lacked effectiveness and precision."

Borussia's Pierre-Emerick Aubameyang scored for the eighth time in four games to remain the league's top-scorer -- one ahead of Lewandowski -- with 22 goals, but could not prevent defeat.

Salomon Kalou had given Hertha an early lead at the Olympic Stadium before Aubameyang netted with his second touch in a move orchestrated by Japan's Shinji Kagawa.

But dead-ball specialist Marvin Plattenhardt smashed home a free kick for Hertha's winner on 71 minutes to give Berlin only their third win in seven games.