BERLIN, Oct. 31 -- Marco Reus' 3-2 overtime winner helped Borussia Dortmund to eliminate second division side Union Berlin meanwhile Werder Bremen eased 5-1 past lower league team Flensburg at the second round in the German Cup On Wednesday.

Union Berlin staged a lively first half performance against much-changed hosts Dortmund. Yet it were the "BVB" who opened the scoring late in the first half when Christian Pulisic poked home a rebound following Shinji Kagawa's header in the 40th minute.

The visitors from the capital remained unimpressed and responded almost straight away but Kenny Prince Redondo's shot on target rattled only the crossbar.

However, Union's efforts were rewarded after the interval as substitute Sebastian Polter shocked the hosts after completing a fast break via Robert Zulj with an hour into the game.

It was a short-lived joy for the visitors though, as Dortmund secured their lead ten minutes later when Maximilian Philipp drilled the ball form sharp angle into the near post corner.

Union kept it bowling and levelled the scores with two minutes to the final whistle as Sebastian Polter headed home Robert Zulj's delivery into the box to force Dortmund into overtime.

Dortmund increased the pressure in the overtime and sealed the deal in the closing period when Marco Reus converted a foul play penalty to book the round of the last 16.

Martin Harnik's brace moved Werder Bremen 5-1 past Flensburg, who were able to hold the pace in the first half.

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