The BVB started brightly on the road as Ramy Bensebaini sent a first warning in the sixth minute before Hummels broke the deadlock, nodding home Julian Brandt's whipped corner into the box with 11 minutes into the match, reports Xinhua.
Niclas Füllkrug made his Borussia Dortmund debut but couldn't prevent the team squandering a two-goal lead as promoted Heidenheim fought back to draw 2-2