Fischer set a record for the greatest number of goals scored in an international under-17 season in 2005–06 with a total of 13.[3]
The then 19-year-old scored his first Bundesliga goal on 17 May 2008 in the last game of the 2007–08 season.
On 4 July 2008, he extended his contract until the summer of 2011.[4]
On 6 January 2009, Fischer was loaned out to TuS Koblenz until the end of the season.[5]
In July 2010, he was loaned out to SV Wacker Burghausen until the end of the season,[6] but the loan was terminated because of a knee injury after six months.[7]