Bayer Leverkusen return from the Bundesliga's winter break with victory at Borussia Dortmund to maintain the pressure on leaders Bayern Munich.

A second-half goal from Alex Grimaldo sent Bayer Leverkusen to a 1-0 home win over Mainz, closing the gap with league leaders Bayern Munich to one point.With half the season played, Dortmund sit ninth,

Promoted Holstein Kiel had to endure Borussia Dortmund's late comeback attempt but held on to claim a 4-2 win in the Bundesliga on Tuesday. The home crowd was euphoric when Shuto Machino broke the deadlock in the 27th,