Former German international Paul Freier put Bayer ahead from the penalty spot on the quarter hour mark but German international Miroslav Klose levelled in the 26th minute with his second goal in as many games.

Then with 13 minutes remaining substitute Almeida popped up with the winning goal to make it a maximum six points from the opening two matches.

FC Nuremberg head the 18-strong Bundesliga ahead of Bremen on goal difference.

Bremen's win puts pressure on Bayern Munich to respond with the champions in action against VfL Bochum on Sunday.

"It was a tough game just as we expected and we needed to give everything to come out on top," said Bremen coach Thomas Schaaf.

"I was glad that we showed character to come from behind again. We have started well with two wins and just need to push on from here."

While Bremen are going strong SV Hamburg, an outside bet for the title, have stumbled out of the blocks and have just two points from as many games.

Thomas Doll's team drew 2-2 with promoted Energie Cottbus on Saturday to complete a miserable week in which Dutch international defender Khalid Boulahrouz joined Chelsea for a reported 13 million euros.

Hamburg went ahead in the 38th minute through Ivory Coast striker Boubacar Sanogo but Vlad Munteanu restored parity on 56 minutes.

Sergiu Radu then surprisingly put Cottbus ahead on 69 minutes before Dutch international Nigel de Jong equalised two minutes later.

"We knew it would be a difficult away game as it is an intimidating atmosphere," explained Hamburg coach Doll.

"It was not much fun watching a hectic match in the closing stages. All I can stress is a point is not enough."

Dark horses Schalke 04 registered their first win of the new campaign overcoming promoted Alemannia Aachen 1-0 on Saturday.

Schalke had Serbia and Montengero international Mladen Krstajic sent off in the 29th minute for a rash challenge but still came out on top thanks to a strike from Dario Rodriguez.

"It was hard work in the first half and we hardly got into the match," admitted Schalke coach Mirko Slomka.

"We changed things around tactically in the second half and played like a top team."