(CNN) -- Martin Jol's SV Hamburg went to the top of the Bundesliga with a 1-0 win over reigning champions Bayern Munich.
Jonathan Pitroipa of Hamburg, top, gets challenged by Philipp Lahm of Bayern in the Bundesliga match Friday.
The top of the table clash was the first match as the German league resumed Friday after the six-week midwinter break and the northerners took full advantage to leapfrog three teams with the crucial victory.
Hamburg grabbed their goal just a minute before halftime with Mladen Petric heading past visiting goalkeeper Michael Rensing.
It was the ninth of the season for Petric, who was without his regular partner and fellow Croatian Ivica Olic up front.
Olic is serving a two-game ban for being sent off in a warm-up friendly for the second half of the German season.
Petric also hit the post soon after the break but Bayern took control in the second half.
Last year's double winners had crushed Stuttgart 5-1 in midweek German Cup action to tune up for the league resumption and created a string of chances in the second half, the best falling to Italian star Luca Toni. But they could not break through.
Bayern coach Juergen Klinsmann gave on-loan striker Landon Donovan his chance for the last quarter of an hour, but the LA Galaxy man could not salvage a point for his new team.
The result leaves Hamburg on 36 points with previous leaders Hoffenheim on 35, ahead of Bayern on goal difference.
Hoffenheim, the surprise packet of the Bundesliga after being promoted last season, can regain top spot when they resume action at home to struggling Energie Cottbus on Saturday.
Fourth-placed Hertha Berlin can also boost their title chances with a match at the Olympic stadium against Eintracht Frankfurt.