BERLIN (Reuters) -- Newly promoted Bundesliga club St Pauli slumped to a surprise 1-0 defeat against amateurs Chemnitzer FC to become the only top division side to exit the German Cup in the first round on Saturday.

All other Bundesliga clubs avoided any unpleasant surprises in the tricky one-legged ties to advance into the second round.

Chemnitzer, playing in the northern regional league, grabbed a fifth minute lead through Andreas Richter and managed to fight off waves of attacks from the Hamburg club to clinch a memorable victory.

Last season's finalists Werder Bremen had little trouble ousting third division Rot Weiss Ahlen 4-0 in what may have been midfielder Mesut Ozil's last game for Werder, with Real Madrid negotiating to sign the gifted Germany playmaker.

Peruvian Claudio Pizarro fired them into the lead in the 28th minute before Hugo Almeida and Tim Borowski made sure of their second round spot with two goals after the interval. Marko Marin added a fourth eight minutes from time.

Ozil was taken off on the hour.

If he does move to Spain, that is likely to happen before Bremen's Champions League qualification playoff against Sampdoria of Italy on Wednesday, because playing in that match would make him ineligible for any Champions League matches for another club this season.

Bayer Leverkusen crushed amateurs FK Pirmasens 11-1 with Germany striker Stefan Kiessling firing them into the lead in the 36th minute, setting off a goal spree with another 10 in the second half. Patrick Helmes netted a hat-trick.

Borussia Dortmund eased past third division club Wacker Burghausen 3-0 while VfB Stuttgart needed a brace from Germany international Cacau to come back from a goal down and beat Babelsberg 2-1.

Hoffenheim netted four times in the first half to kill off early any hopes for third division Hansa Rostock. The game ended 4-0.

Title holders Bayern Munich are in action against fifth division Germania Windeck on Monday, while Schalke 04 play third division Aalen.

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