AFP, Berlin

Bayer Leverkusen on Sunday took over from Bayern Munich as Bundesliga leaders for the second week running after blitzing Freiburg with three vnals in four minutes

on their way to a3-l win.

Leverkusen remain the only side unbeaten in the Bundesliga this season and stunned Freiburg with first-half goals by Germany striker Steffan Kiessling, Swiss forward Eren Derdiyok and exLiverpool defender Sammi Hyypia.

Although Bayern picked up their seventh consecutive league win with a 3-0 victory over Mainz on Saturday, Leverkusen went back to the top and two-points clear after Sunday's win.

"We changed our playing style going into this game and opted to take fewer risks, ” said Bayer coach Jupp Heynckes.

"We had difficulties in the game's opening stages, but if we raise the pace of the game, goals tend to follow.

"Freiburg played quite defensively, but we showed our morale is high by breaking them down. We want to play in Europe,

thathastobeour aim."

Germany squad member Kiessling remains the league's top scorer after he bagged his 13th goal of the season on 36 minutes with a well-taken header.

Then Derdiyok bagged his eighth of the season when he capitalised on a mistake in the Freiburg defence just 60 seconds later for his eighth league goal of the season.

Hyypia made sure of the win with his second goal in two games when his header beat Freiburg goalkeeper Simon Pouplin five minutes before the half-time whistle.

Defender Felix Bastians pulled a consolation goal back for Freiburg, but the defeat leaves them 15th in the table, just one off the relegation zone.

Earlier, Stuttgart coach Christian Gross picked up his fourth straight win and remains undefeated after seven games in charge as his side enjoyed a 4-1 win over Borussia Dortmund.

Goals by Russia forward Pavel Pogrebnyak and Serbian striker Zdravko Kuzmanovic put Stuttgart in charge before Romanian striker Ciprian Marica and Christian Traesch scored late goals to put the result beyond doubt.

The result means the home side have

now claimed 12 points from their last four league games with Spanish giants Barcelona beckoning in the Champions League last 16 clash on February 23.

Schalke 04 are third after their 2-0 win over Hoffenheim on Saturday with goals by striker Kevin Kuranyi and midfielder Lukas Schmitz while the defeat leaves Hoffenheim ninth in the table.

Dutch winger Arjen Robben, Germany striker Mario Gomez and defender Daniel van Buyten all scored in Bayern's win over Mainz in snowy conditions which leaves Bayern second at the end of the weekend.

Elsewhere, Werder Bremen coach Thomas Schaaf is in a precarious position as his side have now gone seven German league games without a win after they went down 4-3 at midtable Borussia Moenchengladbach.

Second from bottom Nuremberg picked up only their second win in their last 10 games when they won 3-1 at Hanover and the result leaves bottom side Hertha Berlin five points adrift after a scoreless draw with Bochum in the capital.

Cologne are up to 13th after their second consecutive win having beaten Eintracht Frankfurt 2-1.

On Friday, defending champions Wolfsburg drew 1-1 draw at Hamburg.