(CNN) -- On loan Andrey Voronin scored another vital goal as Hertha Berlin beat bottom club Borussia Moenchengladbach 2-1 to go back to the top of the Bundesliga on Saturday.
The prolific Voronin is underpinning Hertha's title bid with crucial goals.
It was the fourth in four games for the Ukrainian striker, who was loaned out by Premier League Liverpool for the season, and put Hertha ahead in the first half.
Hungarian international Pal Dardai then struck to put Hertha 2-0 up before half-time in the Olympic Stadium.
A penalty by United States star Michael Bradley saw the visitors pull a goal back on 69 minutes, but Hertha held on to take a one point lead over SV Hambug who play fifth-placed VfL Wolfsburg on Sunday.
Third-placed Hoffenheim, who led before the winter break, could also have reclaimed top spot, but were held 0-0 at Borussia Dortmund.
A massive crowd of 78,000 saw the goalless stalemate and both sides were reduced to ten men when Hoffenheim midfielder Tobias Weis struck out after being brought down by Dortmund's Sebastian Kehl.
Weis was shown a straight red while Kehl went for his second yellow.
Champions Bayern Munich, five points adrift going into the latest round of matches, face a crunch match against Werder Bremen on Sunday.
Both sides performed heroically in Europe in midweek, with Bayern thumping Sporting Lisbon in the Champions Leaguer and Werder Bremen coming from 2-0 down to put out AC Milan in the UEFA Cup.
In other matches on Saturday, struggling Bochum moved out of the bottom three with a 3-2 win over fellow strugglers Energie Cottbus, who drop into the relegation zone.
Schalke 04 move up to seventh after being held to a 1-1 draw by mid-table Eintracht Frankfurt.
But Bayer Leverksen suffered a shock 1-0 home defeat to Hanover which leaves them in sixth spot and unable to further their title aspirations in a congested table.