Ampomah scored and assisted in the previous round which ended in a 5-2 win at Kaiserslaturn.
This time, the 24-year-old Ghanaian started from the bench and it was Saarbrucken who broke the deadlock on their turf in the 31st minute through Tobias Janicke.
Dusseldorf had the chance to level in the 83rd minute from the penalty spot, but Rouwen Hennings effort was saved.
Their equaliser finally came in injury time through Mathias Jurgensen.
Ampomah came on as the fourth substitute in the 104th minute for another Ghanaian in Kelvin Ofori, who was making his third cup appearance this season.
Ofori received a yellow card earlier in the first half for a foul.
On to penalties it went with both sides missing two of their regular five spot kicks.
Next to sudden death, and Ampomah dispatched his with ease.
Dusseldorf were, however, let down by Jurgensen who had his kick saved by Saarbrucken goalie Daniel Batz.
The win sees Saarbrucken march on to the semi-finals for the first time in 35 years and fourth time in their history. Read Full Story

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