(CNN) -- Mainz defeated Werder Bremen 0-2 at the Weserstadion on Saturday to go top of the Bundesliga and maintain their 100 percent record start to the season.
Bremen, who drew 2-2 with Tottenham Hotspur in the Champions League midweek, were stunned as first midfielder Marcel Risse then teenage striker Andre Schuerrle both scored midway through the second half.
"We wanted to defend aggressively and not let Werder come into the game, which we managed very well," Mainz coach Thomas Tuchel said, AFP reported.
Bremen are now 10th in the table with four points.
Hoffenheim, meanwhile, lost their 100 percent record and are now second in the table after they were held to a 2-2 draw by Kaiserslautern.
Hoffenheim were trailing before Iceland midfielder Gylfi Sigurdsson slotted home a 77th minute free kick to rescue a point for his team.
Defending champions Bayern Munich remain in mid-table after they were held to a 0-0 draw by Cologne at the Allianz Arena.
It was Cologne who had the better chances to win the match but Bayern goalkeeper Hans-Joerg Butt salvaged a point for his team.
Bayern now have five points from their four games and are eighth in the table.
Bayern coach Louis van Gaal refused to be too despondent about his teams early season form.
"I am not disappointed with our game. We got in the penalty area on several occasions, but it is always difficult when the opposition put so many players behind the ball," van Gaal said, AFP reported.
"If we continue on this path, then I am sure we will take our chances soon. It is only a matter of time."
Russian striker Pavel Pogrebnyak scored a hat-trick as Stuttgart thumped Borussia Moenchengladbach 7-0, putting an end to their three-match losing streak.
It was also a good day for Ex-England coach Steve McClaren, who picked up his first points as manager of Wolfsburg. Brazilian Diego and Bosnian striker Edin Dzeko were both on target for McClaren as his team defeated Hanover 2-0.
Sunday is derby day in the Bundesliga as Hamburg travel to St Pauli and Borussia Dortmund face Schalke.