© Getty Images
Hamburg took the lead with the help of a mistake from the home skipper and goalkeeper Diego Benaglio, who lost control of Calhanoglu's long-range free kick.
The Turkish midfielder was credited with the goal, but it could later be awarded to Pierre-Michel Lasogga, who ensured that the ball was over the line as he scrambled with Benaglio.
Lasogga, on loan from Hertha Berlin, should have guaranteed that his name was on the scoresheet when he side-footed wide from Tolgay Arslan's cross, less than a minute before Wolfsburg's spot kick was given.
Hamburg came closest to snatching victory, but again failed to capitalise on Arslan's service when Ivo Ilicevic struck the crossbar with four minutes remaining, before an uneventful second half came to an end.