Fritz played for Werder Bremen from 2006 to 2017 and scored five goals in 288 caps. He also represented Germany at the under-21 and senior levels scoring two goals and finishing runner-up at the UEFA European Football Championship. Playing for Werder Bremen Fritz won the DFL-Ligapokal in 2006 and the DFB-Pokal in 2008-09 and was runner up for the Bundesliga in 2007-08, the DFB-Pokal in 2009-10, and the UEFA Cup in 2008-09. Fritz announced his retirement from the game in 2017.