Zauner became the National Junior Champion in 2001. Five further junior titles followed from 2003 to 2005. In 2005 he also won the adult category for the first time and won the Hungarian International and Slovak International. In 2006 he won the Austrian International, 2009 the Slovenian International and 2010 the Romanian International. Zauner ended his international career in 2014. Since 2018 he has been the sports coordinator of the Upper Austrian Badminton Association. In addition, he also studied Marketing Studies from Steyr in Austria. He and his partner Jürgen Koch dominated the Austrian badminton for nearly 25 years. They were one of the strongest doubles pair Austria has produced who reached highest world ranking of 22 in their peak period. Zauner won Austrian national championships for 13 times, two times in singles; eleven times in men's doubles (with Harald Koch and Jürgen Koch).[4]