BERLIN (REUTERS) - Undefeated Bayern Munich outclassed Freiburg 2-0 on Tuesday to extend their lead at the top of the table to 12 points and create a Bundesliga defensive record.

Despite losing Xabi Alonso and Mehdi Benatia to injury midway through the game, Bayern chalked up their 11th win in 12 league games and their powerful back line prevented Freiburg from producing an effort on goal for the opening 75 minutes.

The Bavarians have let in just three goals in 16 league matches this season, a new record that improves on VfB Stuttgart's mark from season 2003-04.

It was one-way traffic from the start as Bayern had a staggering 80 per cent possession of the ball and Freiburg keeper Roman Buerki had to be at his best to keep the scoreline respectable.

The Swiss, who has been in good form in his first Bundesliga season, pulled off a spectacular save to thwart a Mario Goetze effort from seven metres.

Buerki denied Bayern several times but could do nothing to stop the home side going in front when Franck Ribery nodded on an Alonso cross for Arjen Robben and the Dutchman scored with a diving header in the 41st minute.

Thomas Mueller almost made it 2-0 before the break when he hit the post.

The Germany forward made amends three minutes after the restart, heading in after a Juan Bernat shot came back off the bar.

Spaniard Bernat forced another brilliant save from Buerki as Bayern carved out a plethora of chances and had a season-best 31 shots on goal.

Elsewhere, Stuttgart beat fellow strugglers Hamburg SV 1-0 to climb off the foot of the table.

Florian Klein grabbed the only goal in the first half to lift his side to 15th place on 16 points.

Last season's runners-up Borussia Dortmund take on second-placed VfL Wolfsburg on Wednesday.