(CNN) -- Hoffenheim celebrated the first match in their new Rhein-Neckar Arena stadium with a 2-0 win over struggling Energie Cottbus to go back to the top of the Bundesliga.
Hoffenheim players celebrate victory in their new stadium to go back on top.
Hoffenheim went into the six-week midwinter break as leaders, but were temporarily replaced by SV Hamburg after their 1-0 win over champions Bayern Munich on Friday.
But the minnows, who were only promoted last season, showed their quality again as Senagal's Demba Ba and fellow striker Boubacar Sanogo scored their goals in each half.
Hoffenheim were originally based in a small village in the suburbs of Baden Wurttemberg, but with the backing of software mogul Dietmar Hopp have moved into new surroundings and mounting an unlikely title challenge.
In other action on Saturday, Hertha Berlin moved into second in the standings with a 2-1 win over Eintracht Frankfurt in the Olympic stadium.
Striker Marko Pantelic scored their goals with Benjamin Koehler replying for Frankfurt in the second half.
Hoffenheim have 38 points after 18 rounds, two clear of Hertha who head Hamburg on goal difference. Bayern are in fourth a further point adrift.
Bayer Leverkusen, held 1-1 by sixth-placed Borussia Dortmund are on 33 points in a close title race.
Hannover pulled clear of the relegation battle with a 1-0 win over Schalke 04 while Cologne and Wolfsburg shared two goals to stay in mid table.
Stuttgart hit back from their 5-1 midweek humbling by Bayern in the German Cup with a 2-0 victory over Borussia Monchengladbach to continue their climb up the Bundesliga standings.
Sunday's fixtures see Werder Bremen host Arminia Bielefeld with VfL Bochum taking on Karlsruhe.