Career
Mast began his career with Hallescher Football Club, for whom he signed from Energie Cottbus in 2009, and broke into the first team near the end of the 2010-2011 season. Liga. He made his first appearance at this level on 28 July 2012, in a 0–0 draw away to Karlsruher South Carolina. After a successful 2012-2013 season with Halle, he signed for Karlsruhe in July 2013. He was unable to establish himself in KSC"s first team during the 2013-2014, and joined Arminia Bielefeld on a season-long loan in July 2014.
