(CNN) -- Hertha Berlin beat reigning Bundesliga champions Bayern Munich 2-1 on Saturday to go top in Germany.
Voronin's double was enough to secure three points for Hertha.
Two goals from Ukrainian striker Andrey Voronin secured the three points for Hertha.
They leapfrog Hoffenheim who were thrashed 4-1 at home by Bayer Leverkusen on Friday night.
Bayern are in third but have been beaten twice in their last three games to pile the pressure on coach Juergen Klinsmann.
A massive crowd of 74,000 watched the game in Berlin's Olympic Stadium and were celebrating on 38 minutes as Voronin scored the opener.
Bayern equalized midway through the second half as Germany international Miroslav Klose scored after a goalmouth scramble.
On loan Liverpool star Voronin scored the winner in the 77th minute to take them to 40 points after 20 rounds.
Hoffenheim are a point behind with Bayern on 38 points and Bayer Leverkusen 36, the same mark as SV Hamburg, who host Arminia Bielefeld on Sunday.
In other matches, Stuttgart drew 3-3 at Hanover with Thomas Hitzlsperger scoring a late equalizer.
VfL Wolsburg beat Eintracht Frankfurt 2-0 to move up to sixth while Cologne and Karsruhe drew 0-0.
Bochum beat Schalke 2-1 with Werder Bremen and bottom side Borussia Moenchengladbach drawing 1-1.