(CNN) -- SV Hamburg continued their impressive start to the Bundesliga season with a superb 4-2 victory over defending champions VfL Wolfsburg on Sunday.
Hamburg players celebrate an important victory over title rivals Wolfsburg.
Victory took the northerners up to second in the early standings on goal difference behind leaders Bayer Leverkusen, who hammered Freiburg 5-0 on Saturday.
Hamburg charged into an early 2-0 lead as Wolfsburg goalkeeper Diego Benaglio was beaten by Paulo Guerrero after just three minutes before Dutch midfielder Eljero Elia netted the second on seven minutes.
The champions, who had not lost in the league since May, showed their fighting qualities as Zvjezdan Misimovic pulled a goal back on 52 minutes before he set up new signing Obafemi Martins for the equalizer in the 56th minute.
But free-scoring Hamburg went ahead again as Croatia striker Mladen Petric netted on 75 minutes before Dutch midfielder Romeo Castelen scored the fourth at the death.
The defeat leaves the Wolves in fourth place with coach Armin Veh disappointed with their defensive display.
In other key matches on Sunday, Werder Bremen striker Claudio Pizarro marked his return to the Bundesliga after joining from Chelsea with two goals in their 3-0 win over Borussia Moenchengladbach.
Mesut Ozil missed a second-half spot-kick but Ronaldo Naldo added a third two minutes from the end.
But Hertha Berlin suffered a third defeat in a week with a 1-0 loss to VfL Bochum.
Saturday's action was marked by a 2-1 humbling of Bayern Munich by promoted minnows Mainz, with the Munich giants still searching for their first win under Louis van Gaal.
On Friday, Felix Magath's Schalke 04 dropped their first point of the season as they were held to a 0-0 draw by Hoffenheim and are third in the table.