COTTBUS, March 10 (Bundesliga) - Energie Cottbus failed to make it three wins in three as they were downed by visitors Alemannia Aachen in a match between two sides who still have work to do to stay in the Bundesliga.
Sascha Rosler opened the scoring after 26 minutes for the visitors who were then depleted by the sending-off of substitute Sascha Dum seven minutes before the break.
Aachen, who had missed a penalty before Dum's dismissal, held out and then sealed the win in stoppage time with a goal from another substitute, Sergio Pinto.
Cottbus coach Petrik Sander was reportedly set to be sacked a fortnight ago when his team trailed Arminia Bielefeld only to rally to win and a follow-up victory at Borussia Dortmund had transformed the mood for the East Germans.
However, this defeat leaves them just one point above the drop zone while Aachen now have a three-point cushion.
Rosler was first to threaten after nine minutes with a shot from the edge of the area but Tomislav Pipica tipped over.
Cottbus went close when Sergio Radu fed Steffen Baumgart but he was foiled by goalkeeper Stephan Straub.
Rosler opened the scoring after 26 minutes as he broke through and beat Pipica from close range after good work from Jan Schlaudraff.
At the other end Francis Kioyo forced another save from Straub who tipped over.
Aachen could have extended their lead after 35 minutes but Schlaudraff's penalty was saved by Piplica after a foul on Rosler by Vragel da Silva.
Dum then got his marching orders to leave Aachen one man down after 38 minutes for a foul followed by some backchat.
Radu forced a save from Straub before the break but Aachen held out.
They continued to resist after the break with Straub thwarting Kioyo again and the overworked custodian impressed again when he denied Timo Rost.
Aachen could have extended their lead had Rosler not missed after collecting a Pinto pass but at the other end Straub was in brilliant form.
He tipped over a shot from substitute Ervin Skela and then denied another replacement, Daniel Gunkel.
Pinto finished things off in stoppage time when he beat Piplica from close range with Schlaudraff again the provider.