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Bernhard was born in Zell am Ziller, Austria, and started playing tennis at the age of 3 with his father, former Austrian national champion, Kurt Wallner. He continued to learn and train throughout childhood at his father's tennis instruction school, Tennisschule Wallner. In his youth tennis career from the age of 9 to 18, Bernhard won several tournaments in both singles and doubles. At the age of 14 and 16, he was ranked nationally as number 7 and 12 respectively in Austria. At the age of 20, a year after he completed (High) school (Matura), he made steps to the United States, where he studied on a scholarship for 2 years at Valdosta State University, winning the 2011 Division II National Championship.
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