Paolo Guerrero scored two goals to help Hamburger SV beat Cologne 3-1 and take the lead in the Bundesliga on goal difference from Bayer Leverkusen.
|Hamburg's Jose Paolo Guerrero has helped his side become the shock leaders in Germany [AFP]
The Peruvian international striker now tops the list of scorers with four goals in four games along with Leverkusen's Stefan Kiessling.
In the earlier game, Mesut Oezil scored one goal and set up another in Werder Bremen's 3-2 win at Hertha Berlin.
Marko Marin set up two goals for Werder, which jumped to third place in the standings. For Hertha, fourth last season, it was its third straight loss and it dropped to 16th place.
Hamburg and Leverkusen have 10 points from four games, three points ahead of Bremen, Schalke and Moenchengladbach.
Guerrero put Hamburg ahead after 19 minutes, seizing on a poor clearance by Cologne's defence.
His second goal in the 66th came from a deflected shot.
Cologne, winless and last in the standings, pulled one back in the 76th when Adil Chihi unleashed a powerful shot from 25 meters (yards) less than two minutes after coming on as a substitute.
Cologne continued to press, but Hamburg secured the victory from a penalty earned by Ze Roberto following a challenge from by goalkeeper Faryd Mondragon.
"There was no contact,'' a furious Mondragon said after the game.
But Piotr Trochowski scored from the spot to complete the victory.
Bremen win in Berlin
In Berlin, Oezil scored against the run of play in the 57th minute, only minutes after Werder goalkeeper Tim Wiese had blocked a shot by Gojko Kacar. Oezil used a fast counterattack to put his team ahead after a pass from Marin.
Tim Borowski doubled the lead in the 74th after another move by Marin had left the midfielder wide open to tap the ball in.
Three minutes later, Kacar broke through on the left and set up Lukasz Piszczek for Hertha's first goal. But Oezil beat Hertha's defence and passed to the unmarked Naldo, who drove the ball home to make it 3-1.
Patrick Ebert scored in injury time for Hertha.
On Saturday, Arjen Robben scored two goals in his debut for Bayern Munich in a 3-0 victory over defending Bundesliga champion Wolfsburg. Mario Gomez also scored in Bayern's first league victory of the season.
Wolfsburg fell to its second straight defeat.
Also Saturday, Bayer Leverkusen rallied to beat Bochum 2-1, Hoffenheim won in Hannover 1-0 for its first victory of the season, Eintracht Frankfurt and Borussia Dortmund played to a 1-1 draw and Stuttgart was held to a 0-0 draw at home by promoted FC Nuremberg.