Breunig, son of a Thai mother and a German father, played football before he came to basketball.

[1] He played for his hometown club until 2010, including on the side of Mathis Mönninghoff, Tim Unterluggauer and Till-Joscha Jönke in the U19 Bundesliga NBBL.

In the 2010–11 season Breunig joined St. John's Northwestern Military Academy in Delafield, Wisconsin and then moved to the University of Washington, where he studied and played from 2011 to 2013.

[6] Breunig started his professional career by signing in June 2016, a two-year contract with the Bundesliga club MHP Riesen Ludwigsburg.

[6] However, this contract was dissolved after just one year, Breunig moved within the league to the Telekom Baskets Bonn.