(CNN) -- Hertha Berlin opened up a four-point lead at the top of the Bundesliga table as on-loan Liverpool striker Andriy Voronin scored a hat-trick to earn them a 3-1 victory at strugglers Energie Cottbus.
Voronin celebrates the second of his three goals as Hertha Berlin moved four points clear in the Bundesliga.
The visitors found themselves a goal down after 21 minutes when Cagdas Atan fired home a free-kick, but Voronin levelled matters 13 minutes later before adding further goals in the 45th and 88th minutes to seal the points.
The win gives Hertha breathing space over a group of four clubs locked on 42 points. Defending champions Bayern Munich bounced back from their midweek German Cup defeat with a 5-1 rout of Hannover -- a result that moved them up three places in the table.
Hanover actually took the lead through Jiri Stajner but Belgian defender Daniel van Buyten soon headed Bayern level.
Two further first half goals from Miroslav Klose and Hatim Altintop gave Bayern breathing space before Lukas Podolski and Martin Demichelis finished off the scoring.
Bayern lead three other teams on goal difference. Hoffenheim are third after being held to goalless draw at home by Werder Bremen while Edin Dzeko's 39th-minute goal earned Wolfsburg a 1-0 win over Karlsruhe and fourth spot in the table.
However, it was a bad day for Hamburg, who slipped down to fifth place after slumping 4-1 at Borussia Monchengladbach.