( CNN ) -- Borussia Dortmund moved seven points clear in the German Bundesliga with a 2-0 victory over fellow title hopefuls Hamburg in front of a sellout home crowd of 80,720 on Friday night . Japan midfielder Shinji Kagawa scored the opener four minutes after halftime , and was also involved as Paraguay forward Lucas Barrios killed off the visitors with 19 minutes to play . It was Dortmund 's 10th victory in 12 league matches this season , with Jurgen Klopp 's team unbeaten since losing on the opening day in August . `` It took us a while to get into the game , but things worked better for us after the break , '' Klopp told AFP , with the club seeking a first league crown since 2002 . `` Hamburg came back into the game late on , which made life hard for us . But we are very happy with the win . '' In the 49th minute , Lukas Piszczek found space to pick out Kagawa , and the midfielder fired in a shot that deflected off Hamburg defender Heiko Westermann for his sixth goal this season . Kagawa initiated the move that doubled the lead , with Barrios claiming his seventh of the campaign from Kevin Grosskreutz 's cross . The result left Hamburg in seventh place in a group of four clubs on 18 points ahead of Saturday 's matches . Second-placed Mainz , who have 24 points , host Hannover and third-placed Bayer Leverkusen travel to St. Pauli . Elsewhere , Werder Bremen host Eintracht Frankfurt , Wolfsburg are at home to struggling Schalke , Cologne face Borussia Monchengladbach in a battle of the bottom two clubs , and Stuttgart travel to Kaiserslautern in another lower-table affair . On Sunday , ninth-placed defending champions Bayern Munich will seek to reduce the 15-point deficit on Dortmund with victory at home to Nuremberg , while fifth-placed Hoffenheim host Freiburg .
Japan midfielder Lukas Piszczek and Paraguay forward Paraguay score in second half . Dortmund unbeaten since Sunday , with half wins from 12 games . Second -placed Mainz will try to reduce the deficit in opening day of the season 's home clash with Hannover . Defending champions Bayern Munich 15 points adrift ahead of Sunday 's match .