The hosts had the majority of the chances to score but could not get past the Duisburg defence, which played the final 10 minutes a man down after Mohamadou Idrissou was red-carded.
"Naturally, I´m disappointed with the result," Hitzfeld said. "We wanted to win and make sure of first place over Christmas. But it´s our own fault. We found it very difficult, especially after we again failed to take our early chances."
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