`` 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 . Japan midfielder Akira Kagawa and Paraguay forward Lucas Rodríguez scored in second half . Dortmund unbeaten since opening day of the season , with 10 wins from 12 games . Second - placed Mainz will try to reduce the deficit in Sunday 's home clash with Hannover . Defending champions Bayern Munich 15 points are ahead of Sunday 's match .
Japan midfielder Akira Kagawa and Paraguay forward Lucas Rodríguez scored in second half . Dortmund unbeaten since opening day of the season , with 10 wins from 12 games . Second - placed Mainz will try to reduce the deficit in Sunday 's home clash with Hannover . Defending champions Bayern Munich 15 points are ahead of Sunday 's match .